Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Simple NUMA memory policy for the Linux kernel. | |
3 | * | |
4 | * Copyright 2003,2004 Andi Kleen, SuSE Labs. | |
8bccd85f | 5 | * (C) Copyright 2005 Christoph Lameter, Silicon Graphics, Inc. |
1da177e4 LT |
6 | * Subject to the GNU Public License, version 2. |
7 | * | |
8 | * NUMA policy allows the user to give hints in which node(s) memory should | |
9 | * be allocated. | |
10 | * | |
11 | * Support four policies per VMA and per process: | |
12 | * | |
13 | * The VMA policy has priority over the process policy for a page fault. | |
14 | * | |
15 | * interleave Allocate memory interleaved over a set of nodes, | |
16 | * with normal fallback if it fails. | |
17 | * For VMA based allocations this interleaves based on the | |
18 | * offset into the backing object or offset into the mapping | |
19 | * for anonymous memory. For process policy an process counter | |
20 | * is used. | |
8bccd85f | 21 | * |
1da177e4 LT |
22 | * bind Only allocate memory on a specific set of nodes, |
23 | * no fallback. | |
8bccd85f CL |
24 | * FIXME: memory is allocated starting with the first node |
25 | * to the last. It would be better if bind would truly restrict | |
26 | * the allocation to memory nodes instead | |
27 | * | |
1da177e4 | 28 | * preferred Try a specific node first before normal fallback. |
00ef2d2f | 29 | * As a special case NUMA_NO_NODE here means do the allocation |
1da177e4 LT |
30 | * on the local CPU. This is normally identical to default, |
31 | * but useful to set in a VMA when you have a non default | |
32 | * process policy. | |
8bccd85f | 33 | * |
1da177e4 LT |
34 | * default Allocate on the local node first, or when on a VMA |
35 | * use the process policy. This is what Linux always did | |
36 | * in a NUMA aware kernel and still does by, ahem, default. | |
37 | * | |
38 | * The process policy is applied for most non interrupt memory allocations | |
39 | * in that process' context. Interrupts ignore the policies and always | |
40 | * try to allocate on the local CPU. The VMA policy is only applied for memory | |
41 | * allocations for a VMA in the VM. | |
42 | * | |
43 | * Currently there are a few corner cases in swapping where the policy | |
44 | * is not applied, but the majority should be handled. When process policy | |
45 | * is used it is not remembered over swap outs/swap ins. | |
46 | * | |
47 | * Only the highest zone in the zone hierarchy gets policied. Allocations | |
48 | * requesting a lower zone just use default policy. This implies that | |
49 | * on systems with highmem kernel lowmem allocation don't get policied. | |
50 | * Same with GFP_DMA allocations. | |
51 | * | |
52 | * For shmfs/tmpfs/hugetlbfs shared memory the policy is shared between | |
53 | * all users and remembered even when nobody has memory mapped. | |
54 | */ | |
55 | ||
56 | /* Notebook: | |
57 | fix mmap readahead to honour policy and enable policy for any page cache | |
58 | object | |
59 | statistics for bigpages | |
60 | global policy for page cache? currently it uses process policy. Requires | |
61 | first item above. | |
62 | handle mremap for shared memory (currently ignored for the policy) | |
63 | grows down? | |
64 | make bind policy root only? It can trigger oom much faster and the | |
65 | kernel is not always grateful with that. | |
1da177e4 LT |
66 | */ |
67 | ||
b1de0d13 MH |
68 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
69 | ||
1da177e4 LT |
70 | #include <linux/mempolicy.h> |
71 | #include <linux/mm.h> | |
72 | #include <linux/highmem.h> | |
73 | #include <linux/hugetlb.h> | |
74 | #include <linux/kernel.h> | |
75 | #include <linux/sched.h> | |
6e84f315 | 76 | #include <linux/sched/mm.h> |
6a3827d7 | 77 | #include <linux/sched/numa_balancing.h> |
f719ff9b | 78 | #include <linux/sched/task.h> |
1da177e4 LT |
79 | #include <linux/nodemask.h> |
80 | #include <linux/cpuset.h> | |
1da177e4 LT |
81 | #include <linux/slab.h> |
82 | #include <linux/string.h> | |
b95f1b31 | 83 | #include <linux/export.h> |
b488893a | 84 | #include <linux/nsproxy.h> |
1da177e4 LT |
85 | #include <linux/interrupt.h> |
86 | #include <linux/init.h> | |
87 | #include <linux/compat.h> | |
31367466 | 88 | #include <linux/ptrace.h> |
dc9aa5b9 | 89 | #include <linux/swap.h> |
1a75a6c8 CL |
90 | #include <linux/seq_file.h> |
91 | #include <linux/proc_fs.h> | |
b20a3503 | 92 | #include <linux/migrate.h> |
62b61f61 | 93 | #include <linux/ksm.h> |
95a402c3 | 94 | #include <linux/rmap.h> |
86c3a764 | 95 | #include <linux/security.h> |
dbcb0f19 | 96 | #include <linux/syscalls.h> |
095f1fc4 | 97 | #include <linux/ctype.h> |
6d9c285a | 98 | #include <linux/mm_inline.h> |
b24f53a0 | 99 | #include <linux/mmu_notifier.h> |
b1de0d13 | 100 | #include <linux/printk.h> |
c8633798 | 101 | #include <linux/swapops.h> |
dc9aa5b9 | 102 | |
1da177e4 | 103 | #include <asm/tlbflush.h> |
7c0f6ba6 | 104 | #include <linux/uaccess.h> |
1da177e4 | 105 | |
62695a84 NP |
106 | #include "internal.h" |
107 | ||
38e35860 | 108 | /* Internal flags */ |
dc9aa5b9 | 109 | #define MPOL_MF_DISCONTIG_OK (MPOL_MF_INTERNAL << 0) /* Skip checks for continuous vmas */ |
38e35860 | 110 | #define MPOL_MF_INVERT (MPOL_MF_INTERNAL << 1) /* Invert check for nodemask */ |
dc9aa5b9 | 111 | |
fcc234f8 PE |
112 | static struct kmem_cache *policy_cache; |
113 | static struct kmem_cache *sn_cache; | |
1da177e4 | 114 | |
1da177e4 LT |
115 | /* Highest zone. An specific allocation for a zone below that is not |
116 | policied. */ | |
6267276f | 117 | enum zone_type policy_zone = 0; |
1da177e4 | 118 | |
bea904d5 LS |
119 | /* |
120 | * run-time system-wide default policy => local allocation | |
121 | */ | |
e754d79d | 122 | static struct mempolicy default_policy = { |
1da177e4 | 123 | .refcnt = ATOMIC_INIT(1), /* never free it */ |
bea904d5 | 124 | .mode = MPOL_PREFERRED, |
fc36b8d3 | 125 | .flags = MPOL_F_LOCAL, |
1da177e4 LT |
126 | }; |
127 | ||
5606e387 MG |
128 | static struct mempolicy preferred_node_policy[MAX_NUMNODES]; |
129 | ||
74d2c3a0 | 130 | struct mempolicy *get_task_policy(struct task_struct *p) |
5606e387 MG |
131 | { |
132 | struct mempolicy *pol = p->mempolicy; | |
f15ca78e | 133 | int node; |
5606e387 | 134 | |
f15ca78e ON |
135 | if (pol) |
136 | return pol; | |
5606e387 | 137 | |
f15ca78e ON |
138 | node = numa_node_id(); |
139 | if (node != NUMA_NO_NODE) { | |
140 | pol = &preferred_node_policy[node]; | |
141 | /* preferred_node_policy is not initialised early in boot */ | |
142 | if (pol->mode) | |
143 | return pol; | |
5606e387 MG |
144 | } |
145 | ||
f15ca78e | 146 | return &default_policy; |
5606e387 MG |
147 | } |
148 | ||
37012946 DR |
149 | static const struct mempolicy_operations { |
150 | int (*create)(struct mempolicy *pol, const nodemask_t *nodes); | |
213980c0 | 151 | void (*rebind)(struct mempolicy *pol, const nodemask_t *nodes); |
37012946 DR |
152 | } mpol_ops[MPOL_MAX]; |
153 | ||
f5b087b5 DR |
154 | static inline int mpol_store_user_nodemask(const struct mempolicy *pol) |
155 | { | |
6d556294 | 156 | return pol->flags & MPOL_MODE_FLAGS; |
4c50bc01 DR |
157 | } |
158 | ||
159 | static void mpol_relative_nodemask(nodemask_t *ret, const nodemask_t *orig, | |
160 | const nodemask_t *rel) | |
161 | { | |
162 | nodemask_t tmp; | |
163 | nodes_fold(tmp, *orig, nodes_weight(*rel)); | |
164 | nodes_onto(*ret, tmp, *rel); | |
f5b087b5 DR |
165 | } |
166 | ||
37012946 DR |
167 | static int mpol_new_interleave(struct mempolicy *pol, const nodemask_t *nodes) |
168 | { | |
169 | if (nodes_empty(*nodes)) | |
170 | return -EINVAL; | |
171 | pol->v.nodes = *nodes; | |
172 | return 0; | |
173 | } | |
174 | ||
175 | static int mpol_new_preferred(struct mempolicy *pol, const nodemask_t *nodes) | |
176 | { | |
177 | if (!nodes) | |
fc36b8d3 | 178 | pol->flags |= MPOL_F_LOCAL; /* local allocation */ |
37012946 DR |
179 | else if (nodes_empty(*nodes)) |
180 | return -EINVAL; /* no allowed nodes */ | |
181 | else | |
182 | pol->v.preferred_node = first_node(*nodes); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static int mpol_new_bind(struct mempolicy *pol, const nodemask_t *nodes) | |
187 | { | |
859f7ef1 | 188 | if (nodes_empty(*nodes)) |
37012946 DR |
189 | return -EINVAL; |
190 | pol->v.nodes = *nodes; | |
191 | return 0; | |
192 | } | |
193 | ||
58568d2a MX |
194 | /* |
195 | * mpol_set_nodemask is called after mpol_new() to set up the nodemask, if | |
196 | * any, for the new policy. mpol_new() has already validated the nodes | |
197 | * parameter with respect to the policy mode and flags. But, we need to | |
198 | * handle an empty nodemask with MPOL_PREFERRED here. | |
199 | * | |
200 | * Must be called holding task's alloc_lock to protect task's mems_allowed | |
201 | * and mempolicy. May also be called holding the mmap_semaphore for write. | |
202 | */ | |
4bfc4495 KH |
203 | static int mpol_set_nodemask(struct mempolicy *pol, |
204 | const nodemask_t *nodes, struct nodemask_scratch *nsc) | |
58568d2a | 205 | { |
58568d2a MX |
206 | int ret; |
207 | ||
208 | /* if mode is MPOL_DEFAULT, pol is NULL. This is right. */ | |
209 | if (pol == NULL) | |
210 | return 0; | |
01f13bd6 | 211 | /* Check N_MEMORY */ |
4bfc4495 | 212 | nodes_and(nsc->mask1, |
01f13bd6 | 213 | cpuset_current_mems_allowed, node_states[N_MEMORY]); |
58568d2a MX |
214 | |
215 | VM_BUG_ON(!nodes); | |
216 | if (pol->mode == MPOL_PREFERRED && nodes_empty(*nodes)) | |
217 | nodes = NULL; /* explicit local allocation */ | |
218 | else { | |
219 | if (pol->flags & MPOL_F_RELATIVE_NODES) | |
859f7ef1 | 220 | mpol_relative_nodemask(&nsc->mask2, nodes, &nsc->mask1); |
58568d2a | 221 | else |
4bfc4495 KH |
222 | nodes_and(nsc->mask2, *nodes, nsc->mask1); |
223 | ||
58568d2a MX |
224 | if (mpol_store_user_nodemask(pol)) |
225 | pol->w.user_nodemask = *nodes; | |
226 | else | |
227 | pol->w.cpuset_mems_allowed = | |
228 | cpuset_current_mems_allowed; | |
229 | } | |
230 | ||
4bfc4495 KH |
231 | if (nodes) |
232 | ret = mpol_ops[pol->mode].create(pol, &nsc->mask2); | |
233 | else | |
234 | ret = mpol_ops[pol->mode].create(pol, NULL); | |
58568d2a MX |
235 | return ret; |
236 | } | |
237 | ||
238 | /* | |
239 | * This function just creates a new policy, does some check and simple | |
240 | * initialization. You must invoke mpol_set_nodemask() to set nodes. | |
241 | */ | |
028fec41 DR |
242 | static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags, |
243 | nodemask_t *nodes) | |
1da177e4 LT |
244 | { |
245 | struct mempolicy *policy; | |
246 | ||
028fec41 | 247 | pr_debug("setting mode %d flags %d nodes[0] %lx\n", |
00ef2d2f | 248 | mode, flags, nodes ? nodes_addr(*nodes)[0] : NUMA_NO_NODE); |
140d5a49 | 249 | |
3e1f0645 DR |
250 | if (mode == MPOL_DEFAULT) { |
251 | if (nodes && !nodes_empty(*nodes)) | |
37012946 | 252 | return ERR_PTR(-EINVAL); |
d3a71033 | 253 | return NULL; |
37012946 | 254 | } |
3e1f0645 DR |
255 | VM_BUG_ON(!nodes); |
256 | ||
257 | /* | |
258 | * MPOL_PREFERRED cannot be used with MPOL_F_STATIC_NODES or | |
259 | * MPOL_F_RELATIVE_NODES if the nodemask is empty (local allocation). | |
260 | * All other modes require a valid pointer to a non-empty nodemask. | |
261 | */ | |
262 | if (mode == MPOL_PREFERRED) { | |
263 | if (nodes_empty(*nodes)) { | |
264 | if (((flags & MPOL_F_STATIC_NODES) || | |
265 | (flags & MPOL_F_RELATIVE_NODES))) | |
266 | return ERR_PTR(-EINVAL); | |
3e1f0645 | 267 | } |
479e2802 | 268 | } else if (mode == MPOL_LOCAL) { |
8d303e44 PK |
269 | if (!nodes_empty(*nodes) || |
270 | (flags & MPOL_F_STATIC_NODES) || | |
271 | (flags & MPOL_F_RELATIVE_NODES)) | |
479e2802 PZ |
272 | return ERR_PTR(-EINVAL); |
273 | mode = MPOL_PREFERRED; | |
3e1f0645 DR |
274 | } else if (nodes_empty(*nodes)) |
275 | return ERR_PTR(-EINVAL); | |
1da177e4 LT |
276 | policy = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
277 | if (!policy) | |
278 | return ERR_PTR(-ENOMEM); | |
279 | atomic_set(&policy->refcnt, 1); | |
45c4745a | 280 | policy->mode = mode; |
3e1f0645 | 281 | policy->flags = flags; |
37012946 | 282 | |
1da177e4 | 283 | return policy; |
37012946 DR |
284 | } |
285 | ||
52cd3b07 LS |
286 | /* Slow path of a mpol destructor. */ |
287 | void __mpol_put(struct mempolicy *p) | |
288 | { | |
289 | if (!atomic_dec_and_test(&p->refcnt)) | |
290 | return; | |
52cd3b07 LS |
291 | kmem_cache_free(policy_cache, p); |
292 | } | |
293 | ||
213980c0 | 294 | static void mpol_rebind_default(struct mempolicy *pol, const nodemask_t *nodes) |
37012946 DR |
295 | { |
296 | } | |
297 | ||
213980c0 | 298 | static void mpol_rebind_nodemask(struct mempolicy *pol, const nodemask_t *nodes) |
37012946 DR |
299 | { |
300 | nodemask_t tmp; | |
301 | ||
302 | if (pol->flags & MPOL_F_STATIC_NODES) | |
303 | nodes_and(tmp, pol->w.user_nodemask, *nodes); | |
304 | else if (pol->flags & MPOL_F_RELATIVE_NODES) | |
305 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); | |
306 | else { | |
213980c0 VB |
307 | nodes_remap(tmp, pol->v.nodes,pol->w.cpuset_mems_allowed, |
308 | *nodes); | |
309 | pol->w.cpuset_mems_allowed = tmp; | |
37012946 | 310 | } |
f5b087b5 | 311 | |
708c1bbc MX |
312 | if (nodes_empty(tmp)) |
313 | tmp = *nodes; | |
314 | ||
213980c0 | 315 | pol->v.nodes = tmp; |
37012946 DR |
316 | } |
317 | ||
318 | static void mpol_rebind_preferred(struct mempolicy *pol, | |
213980c0 | 319 | const nodemask_t *nodes) |
37012946 DR |
320 | { |
321 | nodemask_t tmp; | |
322 | ||
37012946 DR |
323 | if (pol->flags & MPOL_F_STATIC_NODES) { |
324 | int node = first_node(pol->w.user_nodemask); | |
325 | ||
fc36b8d3 | 326 | if (node_isset(node, *nodes)) { |
37012946 | 327 | pol->v.preferred_node = node; |
fc36b8d3 LS |
328 | pol->flags &= ~MPOL_F_LOCAL; |
329 | } else | |
330 | pol->flags |= MPOL_F_LOCAL; | |
37012946 DR |
331 | } else if (pol->flags & MPOL_F_RELATIVE_NODES) { |
332 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); | |
333 | pol->v.preferred_node = first_node(tmp); | |
fc36b8d3 | 334 | } else if (!(pol->flags & MPOL_F_LOCAL)) { |
37012946 DR |
335 | pol->v.preferred_node = node_remap(pol->v.preferred_node, |
336 | pol->w.cpuset_mems_allowed, | |
337 | *nodes); | |
338 | pol->w.cpuset_mems_allowed = *nodes; | |
339 | } | |
1da177e4 LT |
340 | } |
341 | ||
708c1bbc MX |
342 | /* |
343 | * mpol_rebind_policy - Migrate a policy to a different set of nodes | |
344 | * | |
213980c0 VB |
345 | * Per-vma policies are protected by mmap_sem. Allocations using per-task |
346 | * policies are protected by task->mems_allowed_seq to prevent a premature | |
347 | * OOM/allocation failure due to parallel nodemask modification. | |
708c1bbc | 348 | */ |
213980c0 | 349 | static void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *newmask) |
1d0d2680 | 350 | { |
1d0d2680 DR |
351 | if (!pol) |
352 | return; | |
213980c0 | 353 | if (!mpol_store_user_nodemask(pol) && |
1d0d2680 DR |
354 | nodes_equal(pol->w.cpuset_mems_allowed, *newmask)) |
355 | return; | |
708c1bbc | 356 | |
213980c0 | 357 | mpol_ops[pol->mode].rebind(pol, newmask); |
1d0d2680 DR |
358 | } |
359 | ||
360 | /* | |
361 | * Wrapper for mpol_rebind_policy() that just requires task | |
362 | * pointer, and updates task mempolicy. | |
58568d2a MX |
363 | * |
364 | * Called with task's alloc_lock held. | |
1d0d2680 DR |
365 | */ |
366 | ||
213980c0 | 367 | void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new) |
1d0d2680 | 368 | { |
213980c0 | 369 | mpol_rebind_policy(tsk->mempolicy, new); |
1d0d2680 DR |
370 | } |
371 | ||
372 | /* | |
373 | * Rebind each vma in mm to new nodemask. | |
374 | * | |
375 | * Call holding a reference to mm. Takes mm->mmap_sem during call. | |
376 | */ | |
377 | ||
378 | void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) | |
379 | { | |
380 | struct vm_area_struct *vma; | |
381 | ||
382 | down_write(&mm->mmap_sem); | |
383 | for (vma = mm->mmap; vma; vma = vma->vm_next) | |
213980c0 | 384 | mpol_rebind_policy(vma->vm_policy, new); |
1d0d2680 DR |
385 | up_write(&mm->mmap_sem); |
386 | } | |
387 | ||
37012946 DR |
388 | static const struct mempolicy_operations mpol_ops[MPOL_MAX] = { |
389 | [MPOL_DEFAULT] = { | |
390 | .rebind = mpol_rebind_default, | |
391 | }, | |
392 | [MPOL_INTERLEAVE] = { | |
393 | .create = mpol_new_interleave, | |
394 | .rebind = mpol_rebind_nodemask, | |
395 | }, | |
396 | [MPOL_PREFERRED] = { | |
397 | .create = mpol_new_preferred, | |
398 | .rebind = mpol_rebind_preferred, | |
399 | }, | |
400 | [MPOL_BIND] = { | |
401 | .create = mpol_new_bind, | |
402 | .rebind = mpol_rebind_nodemask, | |
403 | }, | |
404 | }; | |
405 | ||
fc301289 CL |
406 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
407 | unsigned long flags); | |
1a75a6c8 | 408 | |
6f4576e3 NH |
409 | struct queue_pages { |
410 | struct list_head *pagelist; | |
411 | unsigned long flags; | |
412 | nodemask_t *nmask; | |
413 | struct vm_area_struct *prev; | |
414 | }; | |
415 | ||
88aaa2a1 NH |
416 | /* |
417 | * Check if the page's nid is in qp->nmask. | |
418 | * | |
419 | * If MPOL_MF_INVERT is set in qp->flags, check if the nid is | |
420 | * in the invert of qp->nmask. | |
421 | */ | |
422 | static inline bool queue_pages_required(struct page *page, | |
423 | struct queue_pages *qp) | |
424 | { | |
425 | int nid = page_to_nid(page); | |
426 | unsigned long flags = qp->flags; | |
427 | ||
428 | return node_isset(nid, *qp->nmask) == !(flags & MPOL_MF_INVERT); | |
429 | } | |
430 | ||
c8633798 NH |
431 | static int queue_pages_pmd(pmd_t *pmd, spinlock_t *ptl, unsigned long addr, |
432 | unsigned long end, struct mm_walk *walk) | |
433 | { | |
434 | int ret = 0; | |
435 | struct page *page; | |
436 | struct queue_pages *qp = walk->private; | |
437 | unsigned long flags; | |
438 | ||
439 | if (unlikely(is_pmd_migration_entry(*pmd))) { | |
440 | ret = 1; | |
441 | goto unlock; | |
442 | } | |
443 | page = pmd_page(*pmd); | |
444 | if (is_huge_zero_page(page)) { | |
445 | spin_unlock(ptl); | |
446 | __split_huge_pmd(walk->vma, pmd, addr, false, NULL); | |
447 | goto out; | |
448 | } | |
449 | if (!thp_migration_supported()) { | |
450 | get_page(page); | |
451 | spin_unlock(ptl); | |
452 | lock_page(page); | |
453 | ret = split_huge_page(page); | |
454 | unlock_page(page); | |
455 | put_page(page); | |
456 | goto out; | |
457 | } | |
458 | if (!queue_pages_required(page, qp)) { | |
459 | ret = 1; | |
460 | goto unlock; | |
461 | } | |
462 | ||
463 | ret = 1; | |
464 | flags = qp->flags; | |
465 | /* go to thp migration */ | |
466 | if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) | |
467 | migrate_page_add(page, qp->pagelist, flags); | |
468 | unlock: | |
469 | spin_unlock(ptl); | |
470 | out: | |
471 | return ret; | |
472 | } | |
473 | ||
98094945 NH |
474 | /* |
475 | * Scan through pages checking if pages follow certain conditions, | |
476 | * and move them to the pagelist if they do. | |
477 | */ | |
6f4576e3 NH |
478 | static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr, |
479 | unsigned long end, struct mm_walk *walk) | |
1da177e4 | 480 | { |
6f4576e3 NH |
481 | struct vm_area_struct *vma = walk->vma; |
482 | struct page *page; | |
483 | struct queue_pages *qp = walk->private; | |
484 | unsigned long flags = qp->flags; | |
c8633798 | 485 | int ret; |
91612e0d | 486 | pte_t *pte; |
705e87c0 | 487 | spinlock_t *ptl; |
941150a3 | 488 | |
c8633798 NH |
489 | ptl = pmd_trans_huge_lock(pmd, vma); |
490 | if (ptl) { | |
491 | ret = queue_pages_pmd(pmd, ptl, addr, end, walk); | |
492 | if (ret) | |
493 | return 0; | |
248db92d | 494 | } |
91612e0d | 495 | |
337d9abf NH |
496 | if (pmd_trans_unstable(pmd)) |
497 | return 0; | |
248db92d | 498 | retry: |
6f4576e3 NH |
499 | pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
500 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
91612e0d | 501 | if (!pte_present(*pte)) |
1da177e4 | 502 | continue; |
6aab341e LT |
503 | page = vm_normal_page(vma, addr, *pte); |
504 | if (!page) | |
1da177e4 | 505 | continue; |
053837fc | 506 | /* |
62b61f61 HD |
507 | * vm_normal_page() filters out zero pages, but there might |
508 | * still be PageReserved pages to skip, perhaps in a VDSO. | |
053837fc | 509 | */ |
b79bc0a0 | 510 | if (PageReserved(page)) |
f4598c8b | 511 | continue; |
88aaa2a1 | 512 | if (!queue_pages_required(page, qp)) |
38e35860 | 513 | continue; |
c8633798 | 514 | if (PageTransCompound(page) && !thp_migration_supported()) { |
248db92d KS |
515 | get_page(page); |
516 | pte_unmap_unlock(pte, ptl); | |
517 | lock_page(page); | |
518 | ret = split_huge_page(page); | |
519 | unlock_page(page); | |
520 | put_page(page); | |
521 | /* Failed to split -- skip. */ | |
522 | if (ret) { | |
523 | pte = pte_offset_map_lock(walk->mm, pmd, | |
524 | addr, &ptl); | |
525 | continue; | |
526 | } | |
527 | goto retry; | |
528 | } | |
38e35860 | 529 | |
77bf45e7 | 530 | migrate_page_add(page, qp->pagelist, flags); |
6f4576e3 NH |
531 | } |
532 | pte_unmap_unlock(pte - 1, ptl); | |
533 | cond_resched(); | |
534 | return 0; | |
91612e0d HD |
535 | } |
536 | ||
6f4576e3 NH |
537 | static int queue_pages_hugetlb(pte_t *pte, unsigned long hmask, |
538 | unsigned long addr, unsigned long end, | |
539 | struct mm_walk *walk) | |
e2d8cf40 NH |
540 | { |
541 | #ifdef CONFIG_HUGETLB_PAGE | |
6f4576e3 NH |
542 | struct queue_pages *qp = walk->private; |
543 | unsigned long flags = qp->flags; | |
e2d8cf40 | 544 | struct page *page; |
cb900f41 | 545 | spinlock_t *ptl; |
d4c54919 | 546 | pte_t entry; |
e2d8cf40 | 547 | |
6f4576e3 NH |
548 | ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte); |
549 | entry = huge_ptep_get(pte); | |
d4c54919 NH |
550 | if (!pte_present(entry)) |
551 | goto unlock; | |
552 | page = pte_page(entry); | |
88aaa2a1 | 553 | if (!queue_pages_required(page, qp)) |
e2d8cf40 NH |
554 | goto unlock; |
555 | /* With MPOL_MF_MOVE, we migrate only unshared hugepage. */ | |
556 | if (flags & (MPOL_MF_MOVE_ALL) || | |
557 | (flags & MPOL_MF_MOVE && page_mapcount(page) == 1)) | |
6f4576e3 | 558 | isolate_huge_page(page, qp->pagelist); |
e2d8cf40 | 559 | unlock: |
cb900f41 | 560 | spin_unlock(ptl); |
e2d8cf40 NH |
561 | #else |
562 | BUG(); | |
563 | #endif | |
91612e0d | 564 | return 0; |
1da177e4 LT |
565 | } |
566 | ||
5877231f | 567 | #ifdef CONFIG_NUMA_BALANCING |
b24f53a0 | 568 | /* |
4b10e7d5 MG |
569 | * This is used to mark a range of virtual addresses to be inaccessible. |
570 | * These are later cleared by a NUMA hinting fault. Depending on these | |
571 | * faults, pages may be migrated for better NUMA placement. | |
572 | * | |
573 | * This is assuming that NUMA faults are handled using PROT_NONE. If | |
574 | * an architecture makes a different choice, it will need further | |
575 | * changes to the core. | |
b24f53a0 | 576 | */ |
4b10e7d5 MG |
577 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
578 | unsigned long addr, unsigned long end) | |
b24f53a0 | 579 | { |
4b10e7d5 | 580 | int nr_updated; |
b24f53a0 | 581 | |
4d942466 | 582 | nr_updated = change_protection(vma, addr, end, PAGE_NONE, 0, 1); |
03c5a6e1 MG |
583 | if (nr_updated) |
584 | count_vm_numa_events(NUMA_PTE_UPDATES, nr_updated); | |
b24f53a0 | 585 | |
4b10e7d5 | 586 | return nr_updated; |
b24f53a0 LS |
587 | } |
588 | #else | |
589 | static unsigned long change_prot_numa(struct vm_area_struct *vma, | |
590 | unsigned long addr, unsigned long end) | |
591 | { | |
592 | return 0; | |
593 | } | |
5877231f | 594 | #endif /* CONFIG_NUMA_BALANCING */ |
b24f53a0 | 595 | |
6f4576e3 NH |
596 | static int queue_pages_test_walk(unsigned long start, unsigned long end, |
597 | struct mm_walk *walk) | |
598 | { | |
599 | struct vm_area_struct *vma = walk->vma; | |
600 | struct queue_pages *qp = walk->private; | |
601 | unsigned long endvma = vma->vm_end; | |
602 | unsigned long flags = qp->flags; | |
603 | ||
77bf45e7 | 604 | if (!vma_migratable(vma)) |
48684a65 NH |
605 | return 1; |
606 | ||
6f4576e3 NH |
607 | if (endvma > end) |
608 | endvma = end; | |
609 | if (vma->vm_start > start) | |
610 | start = vma->vm_start; | |
611 | ||
612 | if (!(flags & MPOL_MF_DISCONTIG_OK)) { | |
613 | if (!vma->vm_next && vma->vm_end < end) | |
614 | return -EFAULT; | |
615 | if (qp->prev && qp->prev->vm_end < vma->vm_start) | |
616 | return -EFAULT; | |
617 | } | |
618 | ||
619 | qp->prev = vma; | |
620 | ||
6f4576e3 NH |
621 | if (flags & MPOL_MF_LAZY) { |
622 | /* Similar to task_numa_work, skip inaccessible VMAs */ | |
4355c018 LC |
623 | if (!is_vm_hugetlb_page(vma) && |
624 | (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) && | |
625 | !(vma->vm_flags & VM_MIXEDMAP)) | |
6f4576e3 NH |
626 | change_prot_numa(vma, start, endvma); |
627 | return 1; | |
628 | } | |
629 | ||
77bf45e7 KS |
630 | /* queue pages from current vma */ |
631 | if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) | |
6f4576e3 NH |
632 | return 0; |
633 | return 1; | |
634 | } | |
635 | ||
dc9aa5b9 | 636 | /* |
98094945 NH |
637 | * Walk through page tables and collect pages to be migrated. |
638 | * | |
639 | * If pages found in a given range are on a set of nodes (determined by | |
640 | * @nodes and @flags,) it's isolated and queued to the pagelist which is | |
641 | * passed via @private.) | |
dc9aa5b9 | 642 | */ |
d05f0cdc | 643 | static int |
98094945 | 644 | queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end, |
6f4576e3 NH |
645 | nodemask_t *nodes, unsigned long flags, |
646 | struct list_head *pagelist) | |
1da177e4 | 647 | { |
6f4576e3 NH |
648 | struct queue_pages qp = { |
649 | .pagelist = pagelist, | |
650 | .flags = flags, | |
651 | .nmask = nodes, | |
652 | .prev = NULL, | |
653 | }; | |
654 | struct mm_walk queue_pages_walk = { | |
655 | .hugetlb_entry = queue_pages_hugetlb, | |
656 | .pmd_entry = queue_pages_pte_range, | |
657 | .test_walk = queue_pages_test_walk, | |
658 | .mm = mm, | |
659 | .private = &qp, | |
660 | }; | |
661 | ||
662 | return walk_page_range(start, end, &queue_pages_walk); | |
1da177e4 LT |
663 | } |
664 | ||
869833f2 KM |
665 | /* |
666 | * Apply policy to a single VMA | |
667 | * This must be called with the mmap_sem held for writing. | |
668 | */ | |
669 | static int vma_replace_policy(struct vm_area_struct *vma, | |
670 | struct mempolicy *pol) | |
8d34694c | 671 | { |
869833f2 KM |
672 | int err; |
673 | struct mempolicy *old; | |
674 | struct mempolicy *new; | |
8d34694c KM |
675 | |
676 | pr_debug("vma %lx-%lx/%lx vm_ops %p vm_file %p set_policy %p\n", | |
677 | vma->vm_start, vma->vm_end, vma->vm_pgoff, | |
678 | vma->vm_ops, vma->vm_file, | |
679 | vma->vm_ops ? vma->vm_ops->set_policy : NULL); | |
680 | ||
869833f2 KM |
681 | new = mpol_dup(pol); |
682 | if (IS_ERR(new)) | |
683 | return PTR_ERR(new); | |
684 | ||
685 | if (vma->vm_ops && vma->vm_ops->set_policy) { | |
8d34694c | 686 | err = vma->vm_ops->set_policy(vma, new); |
869833f2 KM |
687 | if (err) |
688 | goto err_out; | |
8d34694c | 689 | } |
869833f2 KM |
690 | |
691 | old = vma->vm_policy; | |
692 | vma->vm_policy = new; /* protected by mmap_sem */ | |
693 | mpol_put(old); | |
694 | ||
695 | return 0; | |
696 | err_out: | |
697 | mpol_put(new); | |
8d34694c KM |
698 | return err; |
699 | } | |
700 | ||
1da177e4 | 701 | /* Step 2: apply policy to a range and do splits. */ |
9d8cebd4 KM |
702 | static int mbind_range(struct mm_struct *mm, unsigned long start, |
703 | unsigned long end, struct mempolicy *new_pol) | |
1da177e4 LT |
704 | { |
705 | struct vm_area_struct *next; | |
9d8cebd4 KM |
706 | struct vm_area_struct *prev; |
707 | struct vm_area_struct *vma; | |
708 | int err = 0; | |
e26a5114 | 709 | pgoff_t pgoff; |
9d8cebd4 KM |
710 | unsigned long vmstart; |
711 | unsigned long vmend; | |
1da177e4 | 712 | |
097d5910 | 713 | vma = find_vma(mm, start); |
9d8cebd4 KM |
714 | if (!vma || vma->vm_start > start) |
715 | return -EFAULT; | |
716 | ||
097d5910 | 717 | prev = vma->vm_prev; |
e26a5114 KM |
718 | if (start > vma->vm_start) |
719 | prev = vma; | |
720 | ||
9d8cebd4 | 721 | for (; vma && vma->vm_start < end; prev = vma, vma = next) { |
1da177e4 | 722 | next = vma->vm_next; |
9d8cebd4 KM |
723 | vmstart = max(start, vma->vm_start); |
724 | vmend = min(end, vma->vm_end); | |
725 | ||
e26a5114 KM |
726 | if (mpol_equal(vma_policy(vma), new_pol)) |
727 | continue; | |
728 | ||
729 | pgoff = vma->vm_pgoff + | |
730 | ((vmstart - vma->vm_start) >> PAGE_SHIFT); | |
9d8cebd4 | 731 | prev = vma_merge(mm, prev, vmstart, vmend, vma->vm_flags, |
19a809af AA |
732 | vma->anon_vma, vma->vm_file, pgoff, |
733 | new_pol, vma->vm_userfaultfd_ctx); | |
9d8cebd4 KM |
734 | if (prev) { |
735 | vma = prev; | |
736 | next = vma->vm_next; | |
3964acd0 ON |
737 | if (mpol_equal(vma_policy(vma), new_pol)) |
738 | continue; | |
739 | /* vma_merge() joined vma && vma->next, case 8 */ | |
740 | goto replace; | |
9d8cebd4 KM |
741 | } |
742 | if (vma->vm_start != vmstart) { | |
743 | err = split_vma(vma->vm_mm, vma, vmstart, 1); | |
744 | if (err) | |
745 | goto out; | |
746 | } | |
747 | if (vma->vm_end != vmend) { | |
748 | err = split_vma(vma->vm_mm, vma, vmend, 0); | |
749 | if (err) | |
750 | goto out; | |
751 | } | |
3964acd0 | 752 | replace: |
869833f2 | 753 | err = vma_replace_policy(vma, new_pol); |
8d34694c KM |
754 | if (err) |
755 | goto out; | |
1da177e4 | 756 | } |
9d8cebd4 KM |
757 | |
758 | out: | |
1da177e4 LT |
759 | return err; |
760 | } | |
761 | ||
1da177e4 | 762 | /* Set the process memory policy */ |
028fec41 DR |
763 | static long do_set_mempolicy(unsigned short mode, unsigned short flags, |
764 | nodemask_t *nodes) | |
1da177e4 | 765 | { |
58568d2a | 766 | struct mempolicy *new, *old; |
4bfc4495 | 767 | NODEMASK_SCRATCH(scratch); |
58568d2a | 768 | int ret; |
1da177e4 | 769 | |
4bfc4495 KH |
770 | if (!scratch) |
771 | return -ENOMEM; | |
f4e53d91 | 772 | |
4bfc4495 KH |
773 | new = mpol_new(mode, flags, nodes); |
774 | if (IS_ERR(new)) { | |
775 | ret = PTR_ERR(new); | |
776 | goto out; | |
777 | } | |
2c7c3a7d | 778 | |
58568d2a | 779 | task_lock(current); |
4bfc4495 | 780 | ret = mpol_set_nodemask(new, nodes, scratch); |
58568d2a MX |
781 | if (ret) { |
782 | task_unlock(current); | |
58568d2a | 783 | mpol_put(new); |
4bfc4495 | 784 | goto out; |
58568d2a MX |
785 | } |
786 | old = current->mempolicy; | |
1da177e4 | 787 | current->mempolicy = new; |
45816682 VB |
788 | if (new && new->mode == MPOL_INTERLEAVE) |
789 | current->il_prev = MAX_NUMNODES-1; | |
58568d2a | 790 | task_unlock(current); |
58568d2a | 791 | mpol_put(old); |
4bfc4495 KH |
792 | ret = 0; |
793 | out: | |
794 | NODEMASK_SCRATCH_FREE(scratch); | |
795 | return ret; | |
1da177e4 LT |
796 | } |
797 | ||
bea904d5 LS |
798 | /* |
799 | * Return nodemask for policy for get_mempolicy() query | |
58568d2a MX |
800 | * |
801 | * Called with task's alloc_lock held | |
bea904d5 LS |
802 | */ |
803 | static void get_policy_nodemask(struct mempolicy *p, nodemask_t *nodes) | |
1da177e4 | 804 | { |
dfcd3c0d | 805 | nodes_clear(*nodes); |
bea904d5 LS |
806 | if (p == &default_policy) |
807 | return; | |
808 | ||
45c4745a | 809 | switch (p->mode) { |
19770b32 MG |
810 | case MPOL_BIND: |
811 | /* Fall through */ | |
1da177e4 | 812 | case MPOL_INTERLEAVE: |
dfcd3c0d | 813 | *nodes = p->v.nodes; |
1da177e4 LT |
814 | break; |
815 | case MPOL_PREFERRED: | |
fc36b8d3 | 816 | if (!(p->flags & MPOL_F_LOCAL)) |
dfcd3c0d | 817 | node_set(p->v.preferred_node, *nodes); |
53f2556b | 818 | /* else return empty node mask for local allocation */ |
1da177e4 LT |
819 | break; |
820 | default: | |
821 | BUG(); | |
822 | } | |
823 | } | |
824 | ||
d4edcf0d | 825 | static int lookup_node(unsigned long addr) |
1da177e4 LT |
826 | { |
827 | struct page *p; | |
828 | int err; | |
829 | ||
768ae309 | 830 | err = get_user_pages(addr & PAGE_MASK, 1, 0, &p, NULL); |
1da177e4 LT |
831 | if (err >= 0) { |
832 | err = page_to_nid(p); | |
833 | put_page(p); | |
834 | } | |
835 | return err; | |
836 | } | |
837 | ||
1da177e4 | 838 | /* Retrieve NUMA policy */ |
dbcb0f19 AB |
839 | static long do_get_mempolicy(int *policy, nodemask_t *nmask, |
840 | unsigned long addr, unsigned long flags) | |
1da177e4 | 841 | { |
8bccd85f | 842 | int err; |
1da177e4 LT |
843 | struct mm_struct *mm = current->mm; |
844 | struct vm_area_struct *vma = NULL; | |
845 | struct mempolicy *pol = current->mempolicy; | |
846 | ||
754af6f5 LS |
847 | if (flags & |
848 | ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR|MPOL_F_MEMS_ALLOWED)) | |
1da177e4 | 849 | return -EINVAL; |
754af6f5 LS |
850 | |
851 | if (flags & MPOL_F_MEMS_ALLOWED) { | |
852 | if (flags & (MPOL_F_NODE|MPOL_F_ADDR)) | |
853 | return -EINVAL; | |
854 | *policy = 0; /* just so it's initialized */ | |
58568d2a | 855 | task_lock(current); |
754af6f5 | 856 | *nmask = cpuset_current_mems_allowed; |
58568d2a | 857 | task_unlock(current); |
754af6f5 LS |
858 | return 0; |
859 | } | |
860 | ||
1da177e4 | 861 | if (flags & MPOL_F_ADDR) { |
bea904d5 LS |
862 | /* |
863 | * Do NOT fall back to task policy if the | |
864 | * vma/shared policy at addr is NULL. We | |
865 | * want to return MPOL_DEFAULT in this case. | |
866 | */ | |
1da177e4 LT |
867 | down_read(&mm->mmap_sem); |
868 | vma = find_vma_intersection(mm, addr, addr+1); | |
869 | if (!vma) { | |
870 | up_read(&mm->mmap_sem); | |
871 | return -EFAULT; | |
872 | } | |
873 | if (vma->vm_ops && vma->vm_ops->get_policy) | |
874 | pol = vma->vm_ops->get_policy(vma, addr); | |
875 | else | |
876 | pol = vma->vm_policy; | |
877 | } else if (addr) | |
878 | return -EINVAL; | |
879 | ||
880 | if (!pol) | |
bea904d5 | 881 | pol = &default_policy; /* indicates default behavior */ |
1da177e4 LT |
882 | |
883 | if (flags & MPOL_F_NODE) { | |
884 | if (flags & MPOL_F_ADDR) { | |
d4edcf0d | 885 | err = lookup_node(addr); |
1da177e4 LT |
886 | if (err < 0) |
887 | goto out; | |
8bccd85f | 888 | *policy = err; |
1da177e4 | 889 | } else if (pol == current->mempolicy && |
45c4745a | 890 | pol->mode == MPOL_INTERLEAVE) { |
45816682 | 891 | *policy = next_node_in(current->il_prev, pol->v.nodes); |
1da177e4 LT |
892 | } else { |
893 | err = -EINVAL; | |
894 | goto out; | |
895 | } | |
bea904d5 LS |
896 | } else { |
897 | *policy = pol == &default_policy ? MPOL_DEFAULT : | |
898 | pol->mode; | |
d79df630 DR |
899 | /* |
900 | * Internal mempolicy flags must be masked off before exposing | |
901 | * the policy to userspace. | |
902 | */ | |
903 | *policy |= (pol->flags & MPOL_MODE_FLAGS); | |
bea904d5 | 904 | } |
1da177e4 | 905 | |
1da177e4 | 906 | err = 0; |
58568d2a | 907 | if (nmask) { |
c6b6ef8b LS |
908 | if (mpol_store_user_nodemask(pol)) { |
909 | *nmask = pol->w.user_nodemask; | |
910 | } else { | |
911 | task_lock(current); | |
912 | get_policy_nodemask(pol, nmask); | |
913 | task_unlock(current); | |
914 | } | |
58568d2a | 915 | } |
1da177e4 LT |
916 | |
917 | out: | |
52cd3b07 | 918 | mpol_cond_put(pol); |
1da177e4 LT |
919 | if (vma) |
920 | up_read(¤t->mm->mmap_sem); | |
921 | return err; | |
922 | } | |
923 | ||
b20a3503 | 924 | #ifdef CONFIG_MIGRATION |
6ce3c4c0 | 925 | /* |
c8633798 | 926 | * page migration, thp tail pages can be passed. |
6ce3c4c0 | 927 | */ |
fc301289 CL |
928 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
929 | unsigned long flags) | |
6ce3c4c0 | 930 | { |
c8633798 | 931 | struct page *head = compound_head(page); |
6ce3c4c0 | 932 | /* |
fc301289 | 933 | * Avoid migrating a page that is shared with others. |
6ce3c4c0 | 934 | */ |
c8633798 NH |
935 | if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(head) == 1) { |
936 | if (!isolate_lru_page(head)) { | |
937 | list_add_tail(&head->lru, pagelist); | |
938 | mod_node_page_state(page_pgdat(head), | |
939 | NR_ISOLATED_ANON + page_is_file_cache(head), | |
940 | hpage_nr_pages(head)); | |
62695a84 NP |
941 | } |
942 | } | |
7e2ab150 | 943 | } |
6ce3c4c0 | 944 | |
742755a1 | 945 | static struct page *new_node_page(struct page *page, unsigned long node, int **x) |
95a402c3 | 946 | { |
e2d8cf40 NH |
947 | if (PageHuge(page)) |
948 | return alloc_huge_page_node(page_hstate(compound_head(page)), | |
949 | node); | |
c8633798 NH |
950 | else if (thp_migration_supported() && PageTransHuge(page)) { |
951 | struct page *thp; | |
952 | ||
953 | thp = alloc_pages_node(node, | |
954 | (GFP_TRANSHUGE | __GFP_THISNODE), | |
955 | HPAGE_PMD_ORDER); | |
956 | if (!thp) | |
957 | return NULL; | |
958 | prep_transhuge_page(thp); | |
959 | return thp; | |
960 | } else | |
96db800f | 961 | return __alloc_pages_node(node, GFP_HIGHUSER_MOVABLE | |
b360edb4 | 962 | __GFP_THISNODE, 0); |
95a402c3 CL |
963 | } |
964 | ||
7e2ab150 CL |
965 | /* |
966 | * Migrate pages from one node to a target node. | |
967 | * Returns error or the number of pages not migrated. | |
968 | */ | |
dbcb0f19 AB |
969 | static int migrate_to_node(struct mm_struct *mm, int source, int dest, |
970 | int flags) | |
7e2ab150 CL |
971 | { |
972 | nodemask_t nmask; | |
973 | LIST_HEAD(pagelist); | |
974 | int err = 0; | |
975 | ||
976 | nodes_clear(nmask); | |
977 | node_set(source, nmask); | |
6ce3c4c0 | 978 | |
08270807 MK |
979 | /* |
980 | * This does not "check" the range but isolates all pages that | |
981 | * need migration. Between passing in the full user address | |
982 | * space range and MPOL_MF_DISCONTIG_OK, this call can not fail. | |
983 | */ | |
984 | VM_BUG_ON(!(flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))); | |
98094945 | 985 | queue_pages_range(mm, mm->mmap->vm_start, mm->task_size, &nmask, |
7e2ab150 CL |
986 | flags | MPOL_MF_DISCONTIG_OK, &pagelist); |
987 | ||
cf608ac1 | 988 | if (!list_empty(&pagelist)) { |
68711a74 | 989 | err = migrate_pages(&pagelist, new_node_page, NULL, dest, |
9c620e2b | 990 | MIGRATE_SYNC, MR_SYSCALL); |
cf608ac1 | 991 | if (err) |
e2d8cf40 | 992 | putback_movable_pages(&pagelist); |
cf608ac1 | 993 | } |
95a402c3 | 994 | |
7e2ab150 | 995 | return err; |
6ce3c4c0 CL |
996 | } |
997 | ||
39743889 | 998 | /* |
7e2ab150 CL |
999 | * Move pages between the two nodesets so as to preserve the physical |
1000 | * layout as much as possible. | |
39743889 CL |
1001 | * |
1002 | * Returns the number of page that could not be moved. | |
1003 | */ | |
0ce72d4f AM |
1004 | int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, |
1005 | const nodemask_t *to, int flags) | |
39743889 | 1006 | { |
7e2ab150 | 1007 | int busy = 0; |
0aedadf9 | 1008 | int err; |
7e2ab150 | 1009 | nodemask_t tmp; |
39743889 | 1010 | |
0aedadf9 CL |
1011 | err = migrate_prep(); |
1012 | if (err) | |
1013 | return err; | |
1014 | ||
53f2556b | 1015 | down_read(&mm->mmap_sem); |
39743889 | 1016 | |
da0aa138 KM |
1017 | /* |
1018 | * Find a 'source' bit set in 'tmp' whose corresponding 'dest' | |
1019 | * bit in 'to' is not also set in 'tmp'. Clear the found 'source' | |
1020 | * bit in 'tmp', and return that <source, dest> pair for migration. | |
1021 | * The pair of nodemasks 'to' and 'from' define the map. | |
1022 | * | |
1023 | * If no pair of bits is found that way, fallback to picking some | |
1024 | * pair of 'source' and 'dest' bits that are not the same. If the | |
1025 | * 'source' and 'dest' bits are the same, this represents a node | |
1026 | * that will be migrating to itself, so no pages need move. | |
1027 | * | |
1028 | * If no bits are left in 'tmp', or if all remaining bits left | |
1029 | * in 'tmp' correspond to the same bit in 'to', return false | |
1030 | * (nothing left to migrate). | |
1031 | * | |
1032 | * This lets us pick a pair of nodes to migrate between, such that | |
1033 | * if possible the dest node is not already occupied by some other | |
1034 | * source node, minimizing the risk of overloading the memory on a | |
1035 | * node that would happen if we migrated incoming memory to a node | |
1036 | * before migrating outgoing memory source that same node. | |
1037 | * | |
1038 | * A single scan of tmp is sufficient. As we go, we remember the | |
1039 | * most recent <s, d> pair that moved (s != d). If we find a pair | |
1040 | * that not only moved, but what's better, moved to an empty slot | |
1041 | * (d is not set in tmp), then we break out then, with that pair. | |
ae0e47f0 | 1042 | * Otherwise when we finish scanning from_tmp, we at least have the |
da0aa138 KM |
1043 | * most recent <s, d> pair that moved. If we get all the way through |
1044 | * the scan of tmp without finding any node that moved, much less | |
1045 | * moved to an empty node, then there is nothing left worth migrating. | |
1046 | */ | |
d4984711 | 1047 | |
0ce72d4f | 1048 | tmp = *from; |
7e2ab150 CL |
1049 | while (!nodes_empty(tmp)) { |
1050 | int s,d; | |
b76ac7e7 | 1051 | int source = NUMA_NO_NODE; |
7e2ab150 CL |
1052 | int dest = 0; |
1053 | ||
1054 | for_each_node_mask(s, tmp) { | |
4a5b18cc LW |
1055 | |
1056 | /* | |
1057 | * do_migrate_pages() tries to maintain the relative | |
1058 | * node relationship of the pages established between | |
1059 | * threads and memory areas. | |
1060 | * | |
1061 | * However if the number of source nodes is not equal to | |
1062 | * the number of destination nodes we can not preserve | |
1063 | * this node relative relationship. In that case, skip | |
1064 | * copying memory from a node that is in the destination | |
1065 | * mask. | |
1066 | * | |
1067 | * Example: [2,3,4] -> [3,4,5] moves everything. | |
1068 | * [0-7] - > [3,4,5] moves only 0,1,2,6,7. | |
1069 | */ | |
1070 | ||
0ce72d4f AM |
1071 | if ((nodes_weight(*from) != nodes_weight(*to)) && |
1072 | (node_isset(s, *to))) | |
4a5b18cc LW |
1073 | continue; |
1074 | ||
0ce72d4f | 1075 | d = node_remap(s, *from, *to); |
7e2ab150 CL |
1076 | if (s == d) |
1077 | continue; | |
1078 | ||
1079 | source = s; /* Node moved. Memorize */ | |
1080 | dest = d; | |
1081 | ||
1082 | /* dest not in remaining from nodes? */ | |
1083 | if (!node_isset(dest, tmp)) | |
1084 | break; | |
1085 | } | |
b76ac7e7 | 1086 | if (source == NUMA_NO_NODE) |
7e2ab150 CL |
1087 | break; |
1088 | ||
1089 | node_clear(source, tmp); | |
1090 | err = migrate_to_node(mm, source, dest, flags); | |
1091 | if (err > 0) | |
1092 | busy += err; | |
1093 | if (err < 0) | |
1094 | break; | |
39743889 CL |
1095 | } |
1096 | up_read(&mm->mmap_sem); | |
7e2ab150 CL |
1097 | if (err < 0) |
1098 | return err; | |
1099 | return busy; | |
b20a3503 CL |
1100 | |
1101 | } | |
1102 | ||
3ad33b24 LS |
1103 | /* |
1104 | * Allocate a new page for page migration based on vma policy. | |
d05f0cdc | 1105 | * Start by assuming the page is mapped by the same vma as contains @start. |
3ad33b24 LS |
1106 | * Search forward from there, if not. N.B., this assumes that the |
1107 | * list of pages handed to migrate_pages()--which is how we get here-- | |
1108 | * is in virtual address order. | |
1109 | */ | |
d05f0cdc | 1110 | static struct page *new_page(struct page *page, unsigned long start, int **x) |
95a402c3 | 1111 | { |
d05f0cdc | 1112 | struct vm_area_struct *vma; |
3ad33b24 | 1113 | unsigned long uninitialized_var(address); |
95a402c3 | 1114 | |
d05f0cdc | 1115 | vma = find_vma(current->mm, start); |
3ad33b24 LS |
1116 | while (vma) { |
1117 | address = page_address_in_vma(page, vma); | |
1118 | if (address != -EFAULT) | |
1119 | break; | |
1120 | vma = vma->vm_next; | |
1121 | } | |
11c731e8 WL |
1122 | |
1123 | if (PageHuge(page)) { | |
389c8178 MH |
1124 | return alloc_huge_page_vma(page_hstate(compound_head(page)), |
1125 | vma, address); | |
c8633798 NH |
1126 | } else if (thp_migration_supported() && PageTransHuge(page)) { |
1127 | struct page *thp; | |
1128 | ||
1129 | thp = alloc_hugepage_vma(GFP_TRANSHUGE, vma, address, | |
1130 | HPAGE_PMD_ORDER); | |
1131 | if (!thp) | |
1132 | return NULL; | |
1133 | prep_transhuge_page(thp); | |
1134 | return thp; | |
11c731e8 | 1135 | } |
0bf598d8 | 1136 | /* |
11c731e8 | 1137 | * if !vma, alloc_page_vma() will use task or system default policy |
0bf598d8 | 1138 | */ |
0f556856 MH |
1139 | return alloc_page_vma(GFP_HIGHUSER_MOVABLE | __GFP_RETRY_MAYFAIL, |
1140 | vma, address); | |
95a402c3 | 1141 | } |
b20a3503 CL |
1142 | #else |
1143 | ||
1144 | static void migrate_page_add(struct page *page, struct list_head *pagelist, | |
1145 | unsigned long flags) | |
1146 | { | |
39743889 CL |
1147 | } |
1148 | ||
0ce72d4f AM |
1149 | int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, |
1150 | const nodemask_t *to, int flags) | |
b20a3503 CL |
1151 | { |
1152 | return -ENOSYS; | |
1153 | } | |
95a402c3 | 1154 | |
d05f0cdc | 1155 | static struct page *new_page(struct page *page, unsigned long start, int **x) |
95a402c3 CL |
1156 | { |
1157 | return NULL; | |
1158 | } | |
b20a3503 CL |
1159 | #endif |
1160 | ||
dbcb0f19 | 1161 | static long do_mbind(unsigned long start, unsigned long len, |
028fec41 DR |
1162 | unsigned short mode, unsigned short mode_flags, |
1163 | nodemask_t *nmask, unsigned long flags) | |
6ce3c4c0 | 1164 | { |
6ce3c4c0 CL |
1165 | struct mm_struct *mm = current->mm; |
1166 | struct mempolicy *new; | |
1167 | unsigned long end; | |
1168 | int err; | |
1169 | LIST_HEAD(pagelist); | |
1170 | ||
b24f53a0 | 1171 | if (flags & ~(unsigned long)MPOL_MF_VALID) |
6ce3c4c0 | 1172 | return -EINVAL; |
74c00241 | 1173 | if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE)) |
6ce3c4c0 CL |
1174 | return -EPERM; |
1175 | ||
1176 | if (start & ~PAGE_MASK) | |
1177 | return -EINVAL; | |
1178 | ||
1179 | if (mode == MPOL_DEFAULT) | |
1180 | flags &= ~MPOL_MF_STRICT; | |
1181 | ||
1182 | len = (len + PAGE_SIZE - 1) & PAGE_MASK; | |
1183 | end = start + len; | |
1184 | ||
1185 | if (end < start) | |
1186 | return -EINVAL; | |
1187 | if (end == start) | |
1188 | return 0; | |
1189 | ||
028fec41 | 1190 | new = mpol_new(mode, mode_flags, nmask); |
6ce3c4c0 CL |
1191 | if (IS_ERR(new)) |
1192 | return PTR_ERR(new); | |
1193 | ||
b24f53a0 LS |
1194 | if (flags & MPOL_MF_LAZY) |
1195 | new->flags |= MPOL_F_MOF; | |
1196 | ||
6ce3c4c0 CL |
1197 | /* |
1198 | * If we are using the default policy then operation | |
1199 | * on discontinuous address spaces is okay after all | |
1200 | */ | |
1201 | if (!new) | |
1202 | flags |= MPOL_MF_DISCONTIG_OK; | |
1203 | ||
028fec41 DR |
1204 | pr_debug("mbind %lx-%lx mode:%d flags:%d nodes:%lx\n", |
1205 | start, start + len, mode, mode_flags, | |
00ef2d2f | 1206 | nmask ? nodes_addr(*nmask)[0] : NUMA_NO_NODE); |
6ce3c4c0 | 1207 | |
0aedadf9 CL |
1208 | if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { |
1209 | ||
1210 | err = migrate_prep(); | |
1211 | if (err) | |
b05ca738 | 1212 | goto mpol_out; |
0aedadf9 | 1213 | } |
4bfc4495 KH |
1214 | { |
1215 | NODEMASK_SCRATCH(scratch); | |
1216 | if (scratch) { | |
1217 | down_write(&mm->mmap_sem); | |
1218 | task_lock(current); | |
1219 | err = mpol_set_nodemask(new, nmask, scratch); | |
1220 | task_unlock(current); | |
1221 | if (err) | |
1222 | up_write(&mm->mmap_sem); | |
1223 | } else | |
1224 | err = -ENOMEM; | |
1225 | NODEMASK_SCRATCH_FREE(scratch); | |
1226 | } | |
b05ca738 KM |
1227 | if (err) |
1228 | goto mpol_out; | |
1229 | ||
d05f0cdc | 1230 | err = queue_pages_range(mm, start, end, nmask, |
6ce3c4c0 | 1231 | flags | MPOL_MF_INVERT, &pagelist); |
d05f0cdc | 1232 | if (!err) |
9d8cebd4 | 1233 | err = mbind_range(mm, start, end, new); |
7e2ab150 | 1234 | |
b24f53a0 LS |
1235 | if (!err) { |
1236 | int nr_failed = 0; | |
1237 | ||
cf608ac1 | 1238 | if (!list_empty(&pagelist)) { |
b24f53a0 | 1239 | WARN_ON_ONCE(flags & MPOL_MF_LAZY); |
d05f0cdc HD |
1240 | nr_failed = migrate_pages(&pagelist, new_page, NULL, |
1241 | start, MIGRATE_SYNC, MR_MEMPOLICY_MBIND); | |
cf608ac1 | 1242 | if (nr_failed) |
74060e4d | 1243 | putback_movable_pages(&pagelist); |
cf608ac1 | 1244 | } |
6ce3c4c0 | 1245 | |
b24f53a0 | 1246 | if (nr_failed && (flags & MPOL_MF_STRICT)) |
6ce3c4c0 | 1247 | err = -EIO; |
ab8a3e14 | 1248 | } else |
b0e5fd73 | 1249 | putback_movable_pages(&pagelist); |
b20a3503 | 1250 | |
6ce3c4c0 | 1251 | up_write(&mm->mmap_sem); |
b05ca738 | 1252 | mpol_out: |
f0be3d32 | 1253 | mpol_put(new); |
6ce3c4c0 CL |
1254 | return err; |
1255 | } | |
1256 | ||
8bccd85f CL |
1257 | /* |
1258 | * User space interface with variable sized bitmaps for nodelists. | |
1259 | */ | |
1260 | ||
1261 | /* Copy a node mask from user space. */ | |
39743889 | 1262 | static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask, |
8bccd85f CL |
1263 | unsigned long maxnode) |
1264 | { | |
1265 | unsigned long k; | |
56521e7a | 1266 | unsigned long t; |
8bccd85f CL |
1267 | unsigned long nlongs; |
1268 | unsigned long endmask; | |
1269 | ||
1270 | --maxnode; | |
1271 | nodes_clear(*nodes); | |
1272 | if (maxnode == 0 || !nmask) | |
1273 | return 0; | |
a9c930ba | 1274 | if (maxnode > PAGE_SIZE*BITS_PER_BYTE) |
636f13c1 | 1275 | return -EINVAL; |
8bccd85f CL |
1276 | |
1277 | nlongs = BITS_TO_LONGS(maxnode); | |
1278 | if ((maxnode % BITS_PER_LONG) == 0) | |
1279 | endmask = ~0UL; | |
1280 | else | |
1281 | endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1; | |
1282 | ||
56521e7a YX |
1283 | /* |
1284 | * When the user specified more nodes than supported just check | |
1285 | * if the non supported part is all zero. | |
1286 | * | |
1287 | * If maxnode have more longs than MAX_NUMNODES, check | |
1288 | * the bits in that area first. And then go through to | |
1289 | * check the rest bits which equal or bigger than MAX_NUMNODES. | |
1290 | * Otherwise, just check bits [MAX_NUMNODES, maxnode). | |
1291 | */ | |
8bccd85f | 1292 | if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) { |
8bccd85f | 1293 | for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) { |
8bccd85f CL |
1294 | if (get_user(t, nmask + k)) |
1295 | return -EFAULT; | |
1296 | if (k == nlongs - 1) { | |
1297 | if (t & endmask) | |
1298 | return -EINVAL; | |
1299 | } else if (t) | |
1300 | return -EINVAL; | |
1301 | } | |
1302 | nlongs = BITS_TO_LONGS(MAX_NUMNODES); | |
1303 | endmask = ~0UL; | |
1304 | } | |
1305 | ||
56521e7a YX |
1306 | if (maxnode > MAX_NUMNODES && MAX_NUMNODES % BITS_PER_LONG != 0) { |
1307 | unsigned long valid_mask = endmask; | |
1308 | ||
1309 | valid_mask &= ~((1UL << (MAX_NUMNODES % BITS_PER_LONG)) - 1); | |
1310 | if (get_user(t, nmask + nlongs - 1)) | |
1311 | return -EFAULT; | |
1312 | if (t & valid_mask) | |
1313 | return -EINVAL; | |
1314 | } | |
1315 | ||
8bccd85f CL |
1316 | if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long))) |
1317 | return -EFAULT; | |
1318 | nodes_addr(*nodes)[nlongs-1] &= endmask; | |
1319 | return 0; | |
1320 | } | |
1321 | ||
1322 | /* Copy a kernel node mask to user space */ | |
1323 | static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode, | |
1324 | nodemask_t *nodes) | |
1325 | { | |
1326 | unsigned long copy = ALIGN(maxnode-1, 64) / 8; | |
1327 | const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long); | |
1328 | ||
1329 | if (copy > nbytes) { | |
1330 | if (copy > PAGE_SIZE) | |
1331 | return -EINVAL; | |
1332 | if (clear_user((char __user *)mask + nbytes, copy - nbytes)) | |
1333 | return -EFAULT; | |
1334 | copy = nbytes; | |
1335 | } | |
1336 | return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0; | |
1337 | } | |
1338 | ||
e7dc9ad6 DB |
1339 | static long kernel_mbind(unsigned long start, unsigned long len, |
1340 | unsigned long mode, const unsigned long __user *nmask, | |
1341 | unsigned long maxnode, unsigned int flags) | |
8bccd85f CL |
1342 | { |
1343 | nodemask_t nodes; | |
1344 | int err; | |
028fec41 | 1345 | unsigned short mode_flags; |
8bccd85f | 1346 | |
028fec41 DR |
1347 | mode_flags = mode & MPOL_MODE_FLAGS; |
1348 | mode &= ~MPOL_MODE_FLAGS; | |
a3b51e01 DR |
1349 | if (mode >= MPOL_MAX) |
1350 | return -EINVAL; | |
4c50bc01 DR |
1351 | if ((mode_flags & MPOL_F_STATIC_NODES) && |
1352 | (mode_flags & MPOL_F_RELATIVE_NODES)) | |
1353 | return -EINVAL; | |
8bccd85f CL |
1354 | err = get_nodes(&nodes, nmask, maxnode); |
1355 | if (err) | |
1356 | return err; | |
028fec41 | 1357 | return do_mbind(start, len, mode, mode_flags, &nodes, flags); |
8bccd85f CL |
1358 | } |
1359 | ||
e7dc9ad6 DB |
1360 | SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len, |
1361 | unsigned long, mode, const unsigned long __user *, nmask, | |
1362 | unsigned long, maxnode, unsigned int, flags) | |
1363 | { | |
1364 | return kernel_mbind(start, len, mode, nmask, maxnode, flags); | |
1365 | } | |
1366 | ||
8bccd85f | 1367 | /* Set the process memory policy */ |
af03c4ac DB |
1368 | static long kernel_set_mempolicy(int mode, const unsigned long __user *nmask, |
1369 | unsigned long maxnode) | |
8bccd85f CL |
1370 | { |
1371 | int err; | |
1372 | nodemask_t nodes; | |
028fec41 | 1373 | unsigned short flags; |
8bccd85f | 1374 | |
028fec41 DR |
1375 | flags = mode & MPOL_MODE_FLAGS; |
1376 | mode &= ~MPOL_MODE_FLAGS; | |
1377 | if ((unsigned int)mode >= MPOL_MAX) | |
8bccd85f | 1378 | return -EINVAL; |
4c50bc01 DR |
1379 | if ((flags & MPOL_F_STATIC_NODES) && (flags & MPOL_F_RELATIVE_NODES)) |
1380 | return -EINVAL; | |
8bccd85f CL |
1381 | err = get_nodes(&nodes, nmask, maxnode); |
1382 | if (err) | |
1383 | return err; | |
028fec41 | 1384 | return do_set_mempolicy(mode, flags, &nodes); |
8bccd85f CL |
1385 | } |
1386 | ||
af03c4ac DB |
1387 | SYSCALL_DEFINE3(set_mempolicy, int, mode, const unsigned long __user *, nmask, |
1388 | unsigned long, maxnode) | |
1389 | { | |
1390 | return kernel_set_mempolicy(mode, nmask, maxnode); | |
1391 | } | |
1392 | ||
b6e9b0ba DB |
1393 | static int kernel_migrate_pages(pid_t pid, unsigned long maxnode, |
1394 | const unsigned long __user *old_nodes, | |
1395 | const unsigned long __user *new_nodes) | |
39743889 | 1396 | { |
596d7cfa | 1397 | struct mm_struct *mm = NULL; |
39743889 | 1398 | struct task_struct *task; |
39743889 CL |
1399 | nodemask_t task_nodes; |
1400 | int err; | |
596d7cfa KM |
1401 | nodemask_t *old; |
1402 | nodemask_t *new; | |
1403 | NODEMASK_SCRATCH(scratch); | |
1404 | ||
1405 | if (!scratch) | |
1406 | return -ENOMEM; | |
39743889 | 1407 | |
596d7cfa KM |
1408 | old = &scratch->mask1; |
1409 | new = &scratch->mask2; | |
1410 | ||
1411 | err = get_nodes(old, old_nodes, maxnode); | |
39743889 | 1412 | if (err) |
596d7cfa | 1413 | goto out; |
39743889 | 1414 | |
596d7cfa | 1415 | err = get_nodes(new, new_nodes, maxnode); |
39743889 | 1416 | if (err) |
596d7cfa | 1417 | goto out; |
39743889 CL |
1418 | |
1419 | /* Find the mm_struct */ | |
55cfaa3c | 1420 | rcu_read_lock(); |
228ebcbe | 1421 | task = pid ? find_task_by_vpid(pid) : current; |
39743889 | 1422 | if (!task) { |
55cfaa3c | 1423 | rcu_read_unlock(); |
596d7cfa KM |
1424 | err = -ESRCH; |
1425 | goto out; | |
39743889 | 1426 | } |
3268c63e | 1427 | get_task_struct(task); |
39743889 | 1428 | |
596d7cfa | 1429 | err = -EINVAL; |
39743889 CL |
1430 | |
1431 | /* | |
31367466 OE |
1432 | * Check if this process has the right to modify the specified process. |
1433 | * Use the regular "ptrace_may_access()" checks. | |
39743889 | 1434 | */ |
31367466 | 1435 | if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) { |
c69e8d9c | 1436 | rcu_read_unlock(); |
39743889 | 1437 | err = -EPERM; |
3268c63e | 1438 | goto out_put; |
39743889 | 1439 | } |
c69e8d9c | 1440 | rcu_read_unlock(); |
39743889 CL |
1441 | |
1442 | task_nodes = cpuset_mems_allowed(task); | |
1443 | /* Is the user allowed to access the target nodes? */ | |
596d7cfa | 1444 | if (!nodes_subset(*new, task_nodes) && !capable(CAP_SYS_NICE)) { |
39743889 | 1445 | err = -EPERM; |
3268c63e | 1446 | goto out_put; |
39743889 CL |
1447 | } |
1448 | ||
0486a38b YX |
1449 | task_nodes = cpuset_mems_allowed(current); |
1450 | nodes_and(*new, *new, task_nodes); | |
1451 | if (nodes_empty(*new)) | |
1452 | goto out_put; | |
1453 | ||
1454 | nodes_and(*new, *new, node_states[N_MEMORY]); | |
1455 | if (nodes_empty(*new)) | |
3268c63e | 1456 | goto out_put; |
3b42d28b | 1457 | |
86c3a764 DQ |
1458 | err = security_task_movememory(task); |
1459 | if (err) | |
3268c63e | 1460 | goto out_put; |
86c3a764 | 1461 | |
3268c63e CL |
1462 | mm = get_task_mm(task); |
1463 | put_task_struct(task); | |
f2a9ef88 SL |
1464 | |
1465 | if (!mm) { | |
3268c63e | 1466 | err = -EINVAL; |
f2a9ef88 SL |
1467 | goto out; |
1468 | } | |
1469 | ||
1470 | err = do_migrate_pages(mm, old, new, | |
1471 | capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE); | |
3268c63e CL |
1472 | |
1473 | mmput(mm); | |
1474 | out: | |
596d7cfa KM |
1475 | NODEMASK_SCRATCH_FREE(scratch); |
1476 | ||
39743889 | 1477 | return err; |
3268c63e CL |
1478 | |
1479 | out_put: | |
1480 | put_task_struct(task); | |
1481 | goto out; | |
1482 | ||
39743889 CL |
1483 | } |
1484 | ||
b6e9b0ba DB |
1485 | SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, |
1486 | const unsigned long __user *, old_nodes, | |
1487 | const unsigned long __user *, new_nodes) | |
1488 | { | |
1489 | return kernel_migrate_pages(pid, maxnode, old_nodes, new_nodes); | |
1490 | } | |
1491 | ||
39743889 | 1492 | |
8bccd85f | 1493 | /* Retrieve NUMA policy */ |
af03c4ac DB |
1494 | static int kernel_get_mempolicy(int __user *policy, |
1495 | unsigned long __user *nmask, | |
1496 | unsigned long maxnode, | |
1497 | unsigned long addr, | |
1498 | unsigned long flags) | |
8bccd85f | 1499 | { |
dbcb0f19 AB |
1500 | int err; |
1501 | int uninitialized_var(pval); | |
8bccd85f CL |
1502 | nodemask_t nodes; |
1503 | ||
1504 | if (nmask != NULL && maxnode < MAX_NUMNODES) | |
1505 | return -EINVAL; | |
1506 | ||
1507 | err = do_get_mempolicy(&pval, &nodes, addr, flags); | |
1508 | ||
1509 | if (err) | |
1510 | return err; | |
1511 | ||
1512 | if (policy && put_user(pval, policy)) | |
1513 | return -EFAULT; | |
1514 | ||
1515 | if (nmask) | |
1516 | err = copy_nodes_to_user(nmask, maxnode, &nodes); | |
1517 | ||
1518 | return err; | |
1519 | } | |
1520 | ||
af03c4ac DB |
1521 | SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, |
1522 | unsigned long __user *, nmask, unsigned long, maxnode, | |
1523 | unsigned long, addr, unsigned long, flags) | |
1524 | { | |
1525 | return kernel_get_mempolicy(policy, nmask, maxnode, addr, flags); | |
1526 | } | |
1527 | ||
1da177e4 LT |
1528 | #ifdef CONFIG_COMPAT |
1529 | ||
c93e0f6c HC |
1530 | COMPAT_SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, |
1531 | compat_ulong_t __user *, nmask, | |
1532 | compat_ulong_t, maxnode, | |
1533 | compat_ulong_t, addr, compat_ulong_t, flags) | |
1da177e4 LT |
1534 | { |
1535 | long err; | |
1536 | unsigned long __user *nm = NULL; | |
1537 | unsigned long nr_bits, alloc_size; | |
1538 | DECLARE_BITMAP(bm, MAX_NUMNODES); | |
1539 | ||
1540 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); | |
1541 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; | |
1542 | ||
1543 | if (nmask) | |
1544 | nm = compat_alloc_user_space(alloc_size); | |
1545 | ||
af03c4ac | 1546 | err = kernel_get_mempolicy(policy, nm, nr_bits+1, addr, flags); |
1da177e4 LT |
1547 | |
1548 | if (!err && nmask) { | |
2bbff6c7 KH |
1549 | unsigned long copy_size; |
1550 | copy_size = min_t(unsigned long, sizeof(bm), alloc_size); | |
1551 | err = copy_from_user(bm, nm, copy_size); | |
1da177e4 LT |
1552 | /* ensure entire bitmap is zeroed */ |
1553 | err |= clear_user(nmask, ALIGN(maxnode-1, 8) / 8); | |
1554 | err |= compat_put_bitmap(nmask, bm, nr_bits); | |
1555 | } | |
1556 | ||
1557 | return err; | |
1558 | } | |
1559 | ||
c93e0f6c HC |
1560 | COMPAT_SYSCALL_DEFINE3(set_mempolicy, int, mode, compat_ulong_t __user *, nmask, |
1561 | compat_ulong_t, maxnode) | |
1da177e4 | 1562 | { |
1da177e4 LT |
1563 | unsigned long __user *nm = NULL; |
1564 | unsigned long nr_bits, alloc_size; | |
1565 | DECLARE_BITMAP(bm, MAX_NUMNODES); | |
1566 | ||
1567 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); | |
1568 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; | |
1569 | ||
1570 | if (nmask) { | |
cf01fb99 CS |
1571 | if (compat_get_bitmap(bm, nmask, nr_bits)) |
1572 | return -EFAULT; | |
1da177e4 | 1573 | nm = compat_alloc_user_space(alloc_size); |
cf01fb99 CS |
1574 | if (copy_to_user(nm, bm, alloc_size)) |
1575 | return -EFAULT; | |
1da177e4 LT |
1576 | } |
1577 | ||
af03c4ac | 1578 | return kernel_set_mempolicy(mode, nm, nr_bits+1); |
1da177e4 LT |
1579 | } |
1580 | ||
c93e0f6c HC |
1581 | COMPAT_SYSCALL_DEFINE6(mbind, compat_ulong_t, start, compat_ulong_t, len, |
1582 | compat_ulong_t, mode, compat_ulong_t __user *, nmask, | |
1583 | compat_ulong_t, maxnode, compat_ulong_t, flags) | |
1da177e4 | 1584 | { |
1da177e4 LT |
1585 | unsigned long __user *nm = NULL; |
1586 | unsigned long nr_bits, alloc_size; | |
dfcd3c0d | 1587 | nodemask_t bm; |
1da177e4 LT |
1588 | |
1589 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); | |
1590 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; | |
1591 | ||
1592 | if (nmask) { | |
cf01fb99 CS |
1593 | if (compat_get_bitmap(nodes_addr(bm), nmask, nr_bits)) |
1594 | return -EFAULT; | |
1da177e4 | 1595 | nm = compat_alloc_user_space(alloc_size); |
cf01fb99 CS |
1596 | if (copy_to_user(nm, nodes_addr(bm), alloc_size)) |
1597 | return -EFAULT; | |
1da177e4 LT |
1598 | } |
1599 | ||
e7dc9ad6 | 1600 | return kernel_mbind(start, len, mode, nm, nr_bits+1, flags); |
1da177e4 LT |
1601 | } |
1602 | ||
b6e9b0ba DB |
1603 | COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, |
1604 | compat_ulong_t, maxnode, | |
1605 | const compat_ulong_t __user *, old_nodes, | |
1606 | const compat_ulong_t __user *, new_nodes) | |
1607 | { | |
1608 | unsigned long __user *old = NULL; | |
1609 | unsigned long __user *new = NULL; | |
1610 | nodemask_t tmp_mask; | |
1611 | unsigned long nr_bits; | |
1612 | unsigned long size; | |
1613 | ||
1614 | nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); | |
1615 | size = ALIGN(nr_bits, BITS_PER_LONG) / 8; | |
1616 | if (old_nodes) { | |
1617 | if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) | |
1618 | return -EFAULT; | |
1619 | old = compat_alloc_user_space(new_nodes ? size * 2 : size); | |
1620 | if (new_nodes) | |
1621 | new = old + size / sizeof(unsigned long); | |
1622 | if (copy_to_user(old, nodes_addr(tmp_mask), size)) | |
1623 | return -EFAULT; | |
1624 | } | |
1625 | if (new_nodes) { | |
1626 | if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) | |
1627 | return -EFAULT; | |
1628 | if (new == NULL) | |
1629 | new = compat_alloc_user_space(size); | |
1630 | if (copy_to_user(new, nodes_addr(tmp_mask), size)) | |
1631 | return -EFAULT; | |
1632 | } | |
1633 | return kernel_migrate_pages(pid, nr_bits + 1, old, new); | |
1634 | } | |
1635 | ||
1636 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 1637 | |
74d2c3a0 ON |
1638 | struct mempolicy *__get_vma_policy(struct vm_area_struct *vma, |
1639 | unsigned long addr) | |
1da177e4 | 1640 | { |
8d90274b | 1641 | struct mempolicy *pol = NULL; |
1da177e4 LT |
1642 | |
1643 | if (vma) { | |
480eccf9 | 1644 | if (vma->vm_ops && vma->vm_ops->get_policy) { |
8d90274b | 1645 | pol = vma->vm_ops->get_policy(vma, addr); |
00442ad0 | 1646 | } else if (vma->vm_policy) { |
1da177e4 | 1647 | pol = vma->vm_policy; |
00442ad0 MG |
1648 | |
1649 | /* | |
1650 | * shmem_alloc_page() passes MPOL_F_SHARED policy with | |
1651 | * a pseudo vma whose vma->vm_ops=NULL. Take a reference | |
1652 | * count on these policies which will be dropped by | |
1653 | * mpol_cond_put() later | |
1654 | */ | |
1655 | if (mpol_needs_cond_ref(pol)) | |
1656 | mpol_get(pol); | |
1657 | } | |
1da177e4 | 1658 | } |
f15ca78e | 1659 | |
74d2c3a0 ON |
1660 | return pol; |
1661 | } | |
1662 | ||
1663 | /* | |
dd6eecb9 | 1664 | * get_vma_policy(@vma, @addr) |
74d2c3a0 ON |
1665 | * @vma: virtual memory area whose policy is sought |
1666 | * @addr: address in @vma for shared policy lookup | |
1667 | * | |
1668 | * Returns effective policy for a VMA at specified address. | |
dd6eecb9 | 1669 | * Falls back to current->mempolicy or system default policy, as necessary. |
74d2c3a0 ON |
1670 | * Shared policies [those marked as MPOL_F_SHARED] require an extra reference |
1671 | * count--added by the get_policy() vm_op, as appropriate--to protect against | |
1672 | * freeing by another task. It is the caller's responsibility to free the | |
1673 | * extra reference for shared policies. | |
1674 | */ | |
dd6eecb9 ON |
1675 | static struct mempolicy *get_vma_policy(struct vm_area_struct *vma, |
1676 | unsigned long addr) | |
74d2c3a0 ON |
1677 | { |
1678 | struct mempolicy *pol = __get_vma_policy(vma, addr); | |
1679 | ||
8d90274b | 1680 | if (!pol) |
dd6eecb9 | 1681 | pol = get_task_policy(current); |
8d90274b | 1682 | |
1da177e4 LT |
1683 | return pol; |
1684 | } | |
1685 | ||
6b6482bb | 1686 | bool vma_policy_mof(struct vm_area_struct *vma) |
fc314724 | 1687 | { |
6b6482bb | 1688 | struct mempolicy *pol; |
fc314724 | 1689 | |
6b6482bb ON |
1690 | if (vma->vm_ops && vma->vm_ops->get_policy) { |
1691 | bool ret = false; | |
fc314724 | 1692 | |
6b6482bb ON |
1693 | pol = vma->vm_ops->get_policy(vma, vma->vm_start); |
1694 | if (pol && (pol->flags & MPOL_F_MOF)) | |
1695 | ret = true; | |
1696 | mpol_cond_put(pol); | |
8d90274b | 1697 | |
6b6482bb | 1698 | return ret; |
fc314724 MG |
1699 | } |
1700 | ||
6b6482bb | 1701 | pol = vma->vm_policy; |
8d90274b | 1702 | if (!pol) |
6b6482bb | 1703 | pol = get_task_policy(current); |
8d90274b | 1704 | |
fc314724 MG |
1705 | return pol->flags & MPOL_F_MOF; |
1706 | } | |
1707 | ||
d3eb1570 LJ |
1708 | static int apply_policy_zone(struct mempolicy *policy, enum zone_type zone) |
1709 | { | |
1710 | enum zone_type dynamic_policy_zone = policy_zone; | |
1711 | ||
1712 | BUG_ON(dynamic_policy_zone == ZONE_MOVABLE); | |
1713 | ||
1714 | /* | |
1715 | * if policy->v.nodes has movable memory only, | |
1716 | * we apply policy when gfp_zone(gfp) = ZONE_MOVABLE only. | |
1717 | * | |
1718 | * policy->v.nodes is intersect with node_states[N_MEMORY]. | |
1719 | * so if the following test faile, it implies | |
1720 | * policy->v.nodes has movable memory only. | |
1721 | */ | |
1722 | if (!nodes_intersects(policy->v.nodes, node_states[N_HIGH_MEMORY])) | |
1723 | dynamic_policy_zone = ZONE_MOVABLE; | |
1724 | ||
1725 | return zone >= dynamic_policy_zone; | |
1726 | } | |
1727 | ||
52cd3b07 LS |
1728 | /* |
1729 | * Return a nodemask representing a mempolicy for filtering nodes for | |
1730 | * page allocation | |
1731 | */ | |
1732 | static nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy) | |
19770b32 MG |
1733 | { |
1734 | /* Lower zones don't get a nodemask applied for MPOL_BIND */ | |
45c4745a | 1735 | if (unlikely(policy->mode == MPOL_BIND) && |
d3eb1570 | 1736 | apply_policy_zone(policy, gfp_zone(gfp)) && |
19770b32 MG |
1737 | cpuset_nodemask_valid_mems_allowed(&policy->v.nodes)) |
1738 | return &policy->v.nodes; | |
1739 | ||
1740 | return NULL; | |
1741 | } | |
1742 | ||
04ec6264 VB |
1743 | /* Return the node id preferred by the given mempolicy, or the given id */ |
1744 | static int policy_node(gfp_t gfp, struct mempolicy *policy, | |
1745 | int nd) | |
1da177e4 | 1746 | { |
6d840958 MH |
1747 | if (policy->mode == MPOL_PREFERRED && !(policy->flags & MPOL_F_LOCAL)) |
1748 | nd = policy->v.preferred_node; | |
1749 | else { | |
19770b32 | 1750 | /* |
6d840958 MH |
1751 | * __GFP_THISNODE shouldn't even be used with the bind policy |
1752 | * because we might easily break the expectation to stay on the | |
1753 | * requested node and not break the policy. | |
19770b32 | 1754 | */ |
6d840958 | 1755 | WARN_ON_ONCE(policy->mode == MPOL_BIND && (gfp & __GFP_THISNODE)); |
1da177e4 | 1756 | } |
6d840958 | 1757 | |
04ec6264 | 1758 | return nd; |
1da177e4 LT |
1759 | } |
1760 | ||
1761 | /* Do dynamic interleaving for a process */ | |
1762 | static unsigned interleave_nodes(struct mempolicy *policy) | |
1763 | { | |
45816682 | 1764 | unsigned next; |
1da177e4 LT |
1765 | struct task_struct *me = current; |
1766 | ||
45816682 | 1767 | next = next_node_in(me->il_prev, policy->v.nodes); |
f5b087b5 | 1768 | if (next < MAX_NUMNODES) |
45816682 VB |
1769 | me->il_prev = next; |
1770 | return next; | |
1da177e4 LT |
1771 | } |
1772 | ||
dc85da15 CL |
1773 | /* |
1774 | * Depending on the memory policy provide a node from which to allocate the | |
1775 | * next slab entry. | |
1776 | */ | |
2a389610 | 1777 | unsigned int mempolicy_slab_node(void) |
dc85da15 | 1778 | { |
e7b691b0 | 1779 | struct mempolicy *policy; |
2a389610 | 1780 | int node = numa_mem_id(); |
e7b691b0 AK |
1781 | |
1782 | if (in_interrupt()) | |
2a389610 | 1783 | return node; |
e7b691b0 AK |
1784 | |
1785 | policy = current->mempolicy; | |
fc36b8d3 | 1786 | if (!policy || policy->flags & MPOL_F_LOCAL) |
2a389610 | 1787 | return node; |
bea904d5 LS |
1788 | |
1789 | switch (policy->mode) { | |
1790 | case MPOL_PREFERRED: | |
fc36b8d3 LS |
1791 | /* |
1792 | * handled MPOL_F_LOCAL above | |
1793 | */ | |
1794 | return policy->v.preferred_node; | |
765c4507 | 1795 | |
dc85da15 CL |
1796 | case MPOL_INTERLEAVE: |
1797 | return interleave_nodes(policy); | |
1798 | ||
dd1a239f | 1799 | case MPOL_BIND: { |
c33d6c06 MG |
1800 | struct zoneref *z; |
1801 | ||
dc85da15 CL |
1802 | /* |
1803 | * Follow bind policy behavior and start allocation at the | |
1804 | * first node. | |
1805 | */ | |
19770b32 | 1806 | struct zonelist *zonelist; |
19770b32 | 1807 | enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL); |
c9634cf0 | 1808 | zonelist = &NODE_DATA(node)->node_zonelists[ZONELIST_FALLBACK]; |
c33d6c06 MG |
1809 | z = first_zones_zonelist(zonelist, highest_zoneidx, |
1810 | &policy->v.nodes); | |
1811 | return z->zone ? z->zone->node : node; | |
dd1a239f | 1812 | } |
dc85da15 | 1813 | |
dc85da15 | 1814 | default: |
bea904d5 | 1815 | BUG(); |
dc85da15 CL |
1816 | } |
1817 | } | |
1818 | ||
fee83b3a AM |
1819 | /* |
1820 | * Do static interleaving for a VMA with known offset @n. Returns the n'th | |
1821 | * node in pol->v.nodes (starting from n=0), wrapping around if n exceeds the | |
1822 | * number of present nodes. | |
1823 | */ | |
98c70baa | 1824 | static unsigned offset_il_node(struct mempolicy *pol, unsigned long n) |
1da177e4 | 1825 | { |
dfcd3c0d | 1826 | unsigned nnodes = nodes_weight(pol->v.nodes); |
f5b087b5 | 1827 | unsigned target; |
fee83b3a AM |
1828 | int i; |
1829 | int nid; | |
1da177e4 | 1830 | |
f5b087b5 DR |
1831 | if (!nnodes) |
1832 | return numa_node_id(); | |
fee83b3a AM |
1833 | target = (unsigned int)n % nnodes; |
1834 | nid = first_node(pol->v.nodes); | |
1835 | for (i = 0; i < target; i++) | |
dfcd3c0d | 1836 | nid = next_node(nid, pol->v.nodes); |
1da177e4 LT |
1837 | return nid; |
1838 | } | |
1839 | ||
5da7ca86 CL |
1840 | /* Determine a node number for interleave */ |
1841 | static inline unsigned interleave_nid(struct mempolicy *pol, | |
1842 | struct vm_area_struct *vma, unsigned long addr, int shift) | |
1843 | { | |
1844 | if (vma) { | |
1845 | unsigned long off; | |
1846 | ||
3b98b087 NA |
1847 | /* |
1848 | * for small pages, there is no difference between | |
1849 | * shift and PAGE_SHIFT, so the bit-shift is safe. | |
1850 | * for huge pages, since vm_pgoff is in units of small | |
1851 | * pages, we need to shift off the always 0 bits to get | |
1852 | * a useful offset. | |
1853 | */ | |
1854 | BUG_ON(shift < PAGE_SHIFT); | |
1855 | off = vma->vm_pgoff >> (shift - PAGE_SHIFT); | |
5da7ca86 | 1856 | off += (addr - vma->vm_start) >> shift; |
98c70baa | 1857 | return offset_il_node(pol, off); |
5da7ca86 CL |
1858 | } else |
1859 | return interleave_nodes(pol); | |
1860 | } | |
1861 | ||
00ac59ad | 1862 | #ifdef CONFIG_HUGETLBFS |
480eccf9 | 1863 | /* |
04ec6264 | 1864 | * huge_node(@vma, @addr, @gfp_flags, @mpol) |
b46e14ac FF |
1865 | * @vma: virtual memory area whose policy is sought |
1866 | * @addr: address in @vma for shared policy lookup and interleave policy | |
1867 | * @gfp_flags: for requested zone | |
1868 | * @mpol: pointer to mempolicy pointer for reference counted mempolicy | |
1869 | * @nodemask: pointer to nodemask pointer for MPOL_BIND nodemask | |
480eccf9 | 1870 | * |
04ec6264 | 1871 | * Returns a nid suitable for a huge page allocation and a pointer |
52cd3b07 LS |
1872 | * to the struct mempolicy for conditional unref after allocation. |
1873 | * If the effective policy is 'BIND, returns a pointer to the mempolicy's | |
1874 | * @nodemask for filtering the zonelist. | |
c0ff7453 | 1875 | * |
d26914d1 | 1876 | * Must be protected by read_mems_allowed_begin() |
480eccf9 | 1877 | */ |
04ec6264 VB |
1878 | int huge_node(struct vm_area_struct *vma, unsigned long addr, gfp_t gfp_flags, |
1879 | struct mempolicy **mpol, nodemask_t **nodemask) | |
5da7ca86 | 1880 | { |
04ec6264 | 1881 | int nid; |
5da7ca86 | 1882 | |
dd6eecb9 | 1883 | *mpol = get_vma_policy(vma, addr); |
19770b32 | 1884 | *nodemask = NULL; /* assume !MPOL_BIND */ |
5da7ca86 | 1885 | |
52cd3b07 | 1886 | if (unlikely((*mpol)->mode == MPOL_INTERLEAVE)) { |
04ec6264 VB |
1887 | nid = interleave_nid(*mpol, vma, addr, |
1888 | huge_page_shift(hstate_vma(vma))); | |
52cd3b07 | 1889 | } else { |
04ec6264 | 1890 | nid = policy_node(gfp_flags, *mpol, numa_node_id()); |
52cd3b07 LS |
1891 | if ((*mpol)->mode == MPOL_BIND) |
1892 | *nodemask = &(*mpol)->v.nodes; | |
480eccf9 | 1893 | } |
04ec6264 | 1894 | return nid; |
5da7ca86 | 1895 | } |
06808b08 LS |
1896 | |
1897 | /* | |
1898 | * init_nodemask_of_mempolicy | |
1899 | * | |
1900 | * If the current task's mempolicy is "default" [NULL], return 'false' | |
1901 | * to indicate default policy. Otherwise, extract the policy nodemask | |
1902 | * for 'bind' or 'interleave' policy into the argument nodemask, or | |
1903 | * initialize the argument nodemask to contain the single node for | |
1904 | * 'preferred' or 'local' policy and return 'true' to indicate presence | |
1905 | * of non-default mempolicy. | |
1906 | * | |
1907 | * We don't bother with reference counting the mempolicy [mpol_get/put] | |
1908 | * because the current task is examining it's own mempolicy and a task's | |
1909 | * mempolicy is only ever changed by the task itself. | |
1910 | * | |
1911 | * N.B., it is the caller's responsibility to free a returned nodemask. | |
1912 | */ | |
1913 | bool init_nodemask_of_mempolicy(nodemask_t *mask) | |
1914 | { | |
1915 | struct mempolicy *mempolicy; | |
1916 | int nid; | |
1917 | ||
1918 | if (!(mask && current->mempolicy)) | |
1919 | return false; | |
1920 | ||
c0ff7453 | 1921 | task_lock(current); |
06808b08 LS |
1922 | mempolicy = current->mempolicy; |
1923 | switch (mempolicy->mode) { | |
1924 | case MPOL_PREFERRED: | |
1925 | if (mempolicy->flags & MPOL_F_LOCAL) | |
1926 | nid = numa_node_id(); | |
1927 | else | |
1928 | nid = mempolicy->v.preferred_node; | |
1929 | init_nodemask_of_node(mask, nid); | |
1930 | break; | |
1931 | ||
1932 | case MPOL_BIND: | |
1933 | /* Fall through */ | |
1934 | case MPOL_INTERLEAVE: | |
1935 | *mask = mempolicy->v.nodes; | |
1936 | break; | |
1937 | ||
1938 | default: | |
1939 | BUG(); | |
1940 | } | |
c0ff7453 | 1941 | task_unlock(current); |
06808b08 LS |
1942 | |
1943 | return true; | |
1944 | } | |
00ac59ad | 1945 | #endif |
5da7ca86 | 1946 | |
6f48d0eb DR |
1947 | /* |
1948 | * mempolicy_nodemask_intersects | |
1949 | * | |
1950 | * If tsk's mempolicy is "default" [NULL], return 'true' to indicate default | |
1951 | * policy. Otherwise, check for intersection between mask and the policy | |
1952 | * nodemask for 'bind' or 'interleave' policy. For 'perferred' or 'local' | |
1953 | * policy, always return true since it may allocate elsewhere on fallback. | |
1954 | * | |
1955 | * Takes task_lock(tsk) to prevent freeing of its mempolicy. | |
1956 | */ | |
1957 | bool mempolicy_nodemask_intersects(struct task_struct *tsk, | |
1958 | const nodemask_t *mask) | |
1959 | { | |
1960 | struct mempolicy *mempolicy; | |
1961 | bool ret = true; | |
1962 | ||
1963 | if (!mask) | |
1964 | return ret; | |
1965 | task_lock(tsk); | |
1966 | mempolicy = tsk->mempolicy; | |
1967 | if (!mempolicy) | |
1968 | goto out; | |
1969 | ||
1970 | switch (mempolicy->mode) { | |
1971 | case MPOL_PREFERRED: | |
1972 | /* | |
1973 | * MPOL_PREFERRED and MPOL_F_LOCAL are only preferred nodes to | |
1974 | * allocate from, they may fallback to other nodes when oom. | |
1975 | * Thus, it's possible for tsk to have allocated memory from | |
1976 | * nodes in mask. | |
1977 | */ | |
1978 | break; | |
1979 | case MPOL_BIND: | |
1980 | case MPOL_INTERLEAVE: | |
1981 | ret = nodes_intersects(mempolicy->v.nodes, *mask); | |
1982 | break; | |
1983 | default: | |
1984 | BUG(); | |
1985 | } | |
1986 | out: | |
1987 | task_unlock(tsk); | |
1988 | return ret; | |
1989 | } | |
1990 | ||
1da177e4 LT |
1991 | /* Allocate a page in interleaved policy. |
1992 | Own path because it needs to do special accounting. */ | |
662f3a0b AK |
1993 | static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, |
1994 | unsigned nid) | |
1da177e4 | 1995 | { |
1da177e4 LT |
1996 | struct page *page; |
1997 | ||
04ec6264 | 1998 | page = __alloc_pages(gfp, order, nid); |
4518085e KW |
1999 | /* skip NUMA_INTERLEAVE_HIT counter update if numa stats is disabled */ |
2000 | if (!static_branch_likely(&vm_numa_stat_key)) | |
2001 | return page; | |
de55c8b2 AR |
2002 | if (page && page_to_nid(page) == nid) { |
2003 | preempt_disable(); | |
2004 | __inc_numa_state(page_zone(page), NUMA_INTERLEAVE_HIT); | |
2005 | preempt_enable(); | |
2006 | } | |
1da177e4 LT |
2007 | return page; |
2008 | } | |
2009 | ||
2010 | /** | |
0bbbc0b3 | 2011 | * alloc_pages_vma - Allocate a page for a VMA. |
1da177e4 LT |
2012 | * |
2013 | * @gfp: | |
2014 | * %GFP_USER user allocation. | |
2015 | * %GFP_KERNEL kernel allocations, | |
2016 | * %GFP_HIGHMEM highmem/user allocations, | |
2017 | * %GFP_FS allocation should not call back into a file system. | |
2018 | * %GFP_ATOMIC don't sleep. | |
2019 | * | |
0bbbc0b3 | 2020 | * @order:Order of the GFP allocation. |
1da177e4 LT |
2021 | * @vma: Pointer to VMA or NULL if not available. |
2022 | * @addr: Virtual Address of the allocation. Must be inside the VMA. | |
be97a41b VB |
2023 | * @node: Which node to prefer for allocation (modulo policy). |
2024 | * @hugepage: for hugepages try only the preferred node if possible | |
1da177e4 LT |
2025 | * |
2026 | * This function allocates a page from the kernel page pool and applies | |
2027 | * a NUMA policy associated with the VMA or the current process. | |
2028 | * When VMA is not NULL caller must hold down_read on the mmap_sem of the | |
2029 | * mm_struct of the VMA to prevent it from going away. Should be used for | |
be97a41b VB |
2030 | * all allocations for pages that will be mapped into user space. Returns |
2031 | * NULL when no page can be allocated. | |
1da177e4 LT |
2032 | */ |
2033 | struct page * | |
0bbbc0b3 | 2034 | alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma, |
be97a41b | 2035 | unsigned long addr, int node, bool hugepage) |
1da177e4 | 2036 | { |
cc9a6c87 | 2037 | struct mempolicy *pol; |
c0ff7453 | 2038 | struct page *page; |
04ec6264 | 2039 | int preferred_nid; |
be97a41b | 2040 | nodemask_t *nmask; |
cc9a6c87 | 2041 | |
dd6eecb9 | 2042 | pol = get_vma_policy(vma, addr); |
1da177e4 | 2043 | |
0867a57c VB |
2044 | if (pol->mode == MPOL_INTERLEAVE) { |
2045 | unsigned nid; | |
2046 | ||
2047 | nid = interleave_nid(pol, vma, addr, PAGE_SHIFT + order); | |
2048 | mpol_cond_put(pol); | |
2049 | page = alloc_page_interleave(gfp, order, nid); | |
2050 | goto out; | |
2051 | } | |
2052 | ||
2053 | if (unlikely(IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && hugepage)) { | |
2054 | int hpage_node = node; | |
2055 | ||
be97a41b VB |
2056 | /* |
2057 | * For hugepage allocation and non-interleave policy which | |
0867a57c VB |
2058 | * allows the current node (or other explicitly preferred |
2059 | * node) we only try to allocate from the current/preferred | |
2060 | * node and don't fall back to other nodes, as the cost of | |
2061 | * remote accesses would likely offset THP benefits. | |
be97a41b VB |
2062 | * |
2063 | * If the policy is interleave, or does not allow the current | |
2064 | * node in its nodemask, we allocate the standard way. | |
2065 | */ | |
0867a57c VB |
2066 | if (pol->mode == MPOL_PREFERRED && |
2067 | !(pol->flags & MPOL_F_LOCAL)) | |
2068 | hpage_node = pol->v.preferred_node; | |
2069 | ||
be97a41b | 2070 | nmask = policy_nodemask(gfp, pol); |
0867a57c | 2071 | if (!nmask || node_isset(hpage_node, *nmask)) { |
be97a41b | 2072 | mpol_cond_put(pol); |
96db800f | 2073 | page = __alloc_pages_node(hpage_node, |
5265047a | 2074 | gfp | __GFP_THISNODE, order); |
be97a41b VB |
2075 | goto out; |
2076 | } | |
2077 | } | |
2078 | ||
be97a41b | 2079 | nmask = policy_nodemask(gfp, pol); |
04ec6264 VB |
2080 | preferred_nid = policy_node(gfp, pol, node); |
2081 | page = __alloc_pages_nodemask(gfp, order, preferred_nid, nmask); | |
d51e9894 | 2082 | mpol_cond_put(pol); |
be97a41b | 2083 | out: |
c0ff7453 | 2084 | return page; |
1da177e4 LT |
2085 | } |
2086 | ||
2087 | /** | |
2088 | * alloc_pages_current - Allocate pages. | |
2089 | * | |
2090 | * @gfp: | |
2091 | * %GFP_USER user allocation, | |
2092 | * %GFP_KERNEL kernel allocation, | |
2093 | * %GFP_HIGHMEM highmem allocation, | |
2094 | * %GFP_FS don't call back into a file system. | |
2095 | * %GFP_ATOMIC don't sleep. | |
2096 | * @order: Power of two of allocation size in pages. 0 is a single page. | |
2097 | * | |
2098 | * Allocate a page from the kernel page pool. When not in | |
2099 | * interrupt context and apply the current process NUMA policy. | |
2100 | * Returns NULL when no page can be allocated. | |
1da177e4 | 2101 | */ |
dd0fc66f | 2102 | struct page *alloc_pages_current(gfp_t gfp, unsigned order) |
1da177e4 | 2103 | { |
8d90274b | 2104 | struct mempolicy *pol = &default_policy; |
c0ff7453 | 2105 | struct page *page; |
1da177e4 | 2106 | |
8d90274b ON |
2107 | if (!in_interrupt() && !(gfp & __GFP_THISNODE)) |
2108 | pol = get_task_policy(current); | |
52cd3b07 LS |
2109 | |
2110 | /* | |
2111 | * No reference counting needed for current->mempolicy | |
2112 | * nor system default_policy | |
2113 | */ | |
45c4745a | 2114 | if (pol->mode == MPOL_INTERLEAVE) |
c0ff7453 MX |
2115 | page = alloc_page_interleave(gfp, order, interleave_nodes(pol)); |
2116 | else | |
2117 | page = __alloc_pages_nodemask(gfp, order, | |
04ec6264 | 2118 | policy_node(gfp, pol, numa_node_id()), |
5c4b4be3 | 2119 | policy_nodemask(gfp, pol)); |
cc9a6c87 | 2120 | |
c0ff7453 | 2121 | return page; |
1da177e4 LT |
2122 | } |
2123 | EXPORT_SYMBOL(alloc_pages_current); | |
2124 | ||
ef0855d3 ON |
2125 | int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst) |
2126 | { | |
2127 | struct mempolicy *pol = mpol_dup(vma_policy(src)); | |
2128 | ||
2129 | if (IS_ERR(pol)) | |
2130 | return PTR_ERR(pol); | |
2131 | dst->vm_policy = pol; | |
2132 | return 0; | |
2133 | } | |
2134 | ||
4225399a | 2135 | /* |
846a16bf | 2136 | * If mpol_dup() sees current->cpuset == cpuset_being_rebound, then it |
4225399a PJ |
2137 | * rebinds the mempolicy its copying by calling mpol_rebind_policy() |
2138 | * with the mems_allowed returned by cpuset_mems_allowed(). This | |
2139 | * keeps mempolicies cpuset relative after its cpuset moves. See | |
2140 | * further kernel/cpuset.c update_nodemask(). | |
708c1bbc MX |
2141 | * |
2142 | * current's mempolicy may be rebinded by the other task(the task that changes | |
2143 | * cpuset's mems), so we needn't do rebind work for current task. | |
4225399a | 2144 | */ |
4225399a | 2145 | |
846a16bf LS |
2146 | /* Slow path of a mempolicy duplicate */ |
2147 | struct mempolicy *__mpol_dup(struct mempolicy *old) | |
1da177e4 LT |
2148 | { |
2149 | struct mempolicy *new = kmem_cache_alloc(policy_cache, GFP_KERNEL); | |
2150 | ||
2151 | if (!new) | |
2152 | return ERR_PTR(-ENOMEM); | |
708c1bbc MX |
2153 | |
2154 | /* task's mempolicy is protected by alloc_lock */ | |
2155 | if (old == current->mempolicy) { | |
2156 | task_lock(current); | |
2157 | *new = *old; | |
2158 | task_unlock(current); | |
2159 | } else | |
2160 | *new = *old; | |
2161 | ||
4225399a PJ |
2162 | if (current_cpuset_is_being_rebound()) { |
2163 | nodemask_t mems = cpuset_mems_allowed(current); | |
213980c0 | 2164 | mpol_rebind_policy(new, &mems); |
4225399a | 2165 | } |
1da177e4 | 2166 | atomic_set(&new->refcnt, 1); |
1da177e4 LT |
2167 | return new; |
2168 | } | |
2169 | ||
2170 | /* Slow path of a mempolicy comparison */ | |
fcfb4dcc | 2171 | bool __mpol_equal(struct mempolicy *a, struct mempolicy *b) |
1da177e4 LT |
2172 | { |
2173 | if (!a || !b) | |
fcfb4dcc | 2174 | return false; |
45c4745a | 2175 | if (a->mode != b->mode) |
fcfb4dcc | 2176 | return false; |
19800502 | 2177 | if (a->flags != b->flags) |
fcfb4dcc | 2178 | return false; |
19800502 BL |
2179 | if (mpol_store_user_nodemask(a)) |
2180 | if (!nodes_equal(a->w.user_nodemask, b->w.user_nodemask)) | |
fcfb4dcc | 2181 | return false; |
19800502 | 2182 | |
45c4745a | 2183 | switch (a->mode) { |
19770b32 MG |
2184 | case MPOL_BIND: |
2185 | /* Fall through */ | |
1da177e4 | 2186 | case MPOL_INTERLEAVE: |
fcfb4dcc | 2187 | return !!nodes_equal(a->v.nodes, b->v.nodes); |
1da177e4 | 2188 | case MPOL_PREFERRED: |
8970a63e YX |
2189 | /* a's ->flags is the same as b's */ |
2190 | if (a->flags & MPOL_F_LOCAL) | |
2191 | return true; | |
75719661 | 2192 | return a->v.preferred_node == b->v.preferred_node; |
1da177e4 LT |
2193 | default: |
2194 | BUG(); | |
fcfb4dcc | 2195 | return false; |
1da177e4 LT |
2196 | } |
2197 | } | |
2198 | ||
1da177e4 LT |
2199 | /* |
2200 | * Shared memory backing store policy support. | |
2201 | * | |
2202 | * Remember policies even when nobody has shared memory mapped. | |
2203 | * The policies are kept in Red-Black tree linked from the inode. | |
4a8c7bb5 | 2204 | * They are protected by the sp->lock rwlock, which should be held |
1da177e4 LT |
2205 | * for any accesses to the tree. |
2206 | */ | |
2207 | ||
4a8c7bb5 NZ |
2208 | /* |
2209 | * lookup first element intersecting start-end. Caller holds sp->lock for | |
2210 | * reading or for writing | |
2211 | */ | |
1da177e4 LT |
2212 | static struct sp_node * |
2213 | sp_lookup(struct shared_policy *sp, unsigned long start, unsigned long end) | |
2214 | { | |
2215 | struct rb_node *n = sp->root.rb_node; | |
2216 | ||
2217 | while (n) { | |
2218 | struct sp_node *p = rb_entry(n, struct sp_node, nd); | |
2219 | ||
2220 | if (start >= p->end) | |
2221 | n = n->rb_right; | |
2222 | else if (end <= p->start) | |
2223 | n = n->rb_left; | |
2224 | else | |
2225 | break; | |
2226 | } | |
2227 | if (!n) | |
2228 | return NULL; | |
2229 | for (;;) { | |
2230 | struct sp_node *w = NULL; | |
2231 | struct rb_node *prev = rb_prev(n); | |
2232 | if (!prev) | |
2233 | break; | |
2234 | w = rb_entry(prev, struct sp_node, nd); | |
2235 | if (w->end <= start) | |
2236 | break; | |
2237 | n = prev; | |
2238 | } | |
2239 | return rb_entry(n, struct sp_node, nd); | |
2240 | } | |
2241 | ||
4a8c7bb5 NZ |
2242 | /* |
2243 | * Insert a new shared policy into the list. Caller holds sp->lock for | |
2244 | * writing. | |
2245 | */ | |
1da177e4 LT |
2246 | static void sp_insert(struct shared_policy *sp, struct sp_node *new) |
2247 | { | |
2248 | struct rb_node **p = &sp->root.rb_node; | |
2249 | struct rb_node *parent = NULL; | |
2250 | struct sp_node *nd; | |
2251 | ||
2252 | while (*p) { | |
2253 | parent = *p; | |
2254 | nd = rb_entry(parent, struct sp_node, nd); | |
2255 | if (new->start < nd->start) | |
2256 | p = &(*p)->rb_left; | |
2257 | else if (new->end > nd->end) | |
2258 | p = &(*p)->rb_right; | |
2259 | else | |
2260 | BUG(); | |
2261 | } | |
2262 | rb_link_node(&new->nd, parent, p); | |
2263 | rb_insert_color(&new->nd, &sp->root); | |
140d5a49 | 2264 | pr_debug("inserting %lx-%lx: %d\n", new->start, new->end, |
45c4745a | 2265 | new->policy ? new->policy->mode : 0); |
1da177e4 LT |
2266 | } |
2267 | ||
2268 | /* Find shared policy intersecting idx */ | |
2269 | struct mempolicy * | |
2270 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
2271 | { | |
2272 | struct mempolicy *pol = NULL; | |
2273 | struct sp_node *sn; | |
2274 | ||
2275 | if (!sp->root.rb_node) | |
2276 | return NULL; | |
4a8c7bb5 | 2277 | read_lock(&sp->lock); |
1da177e4 LT |
2278 | sn = sp_lookup(sp, idx, idx+1); |
2279 | if (sn) { | |
2280 | mpol_get(sn->policy); | |
2281 | pol = sn->policy; | |
2282 | } | |
4a8c7bb5 | 2283 | read_unlock(&sp->lock); |
1da177e4 LT |
2284 | return pol; |
2285 | } | |
2286 | ||
63f74ca2 KM |
2287 | static void sp_free(struct sp_node *n) |
2288 | { | |
2289 | mpol_put(n->policy); | |
2290 | kmem_cache_free(sn_cache, n); | |
2291 | } | |
2292 | ||
771fb4d8 LS |
2293 | /** |
2294 | * mpol_misplaced - check whether current page node is valid in policy | |
2295 | * | |
b46e14ac FF |
2296 | * @page: page to be checked |
2297 | * @vma: vm area where page mapped | |
2298 | * @addr: virtual address where page mapped | |
771fb4d8 LS |
2299 | * |
2300 | * Lookup current policy node id for vma,addr and "compare to" page's | |
2301 | * node id. | |
2302 | * | |
2303 | * Returns: | |
2304 | * -1 - not misplaced, page is in the right node | |
2305 | * node - node id where the page should be | |
2306 | * | |
2307 | * Policy determination "mimics" alloc_page_vma(). | |
2308 | * Called from fault path where we know the vma and faulting address. | |
2309 | */ | |
2310 | int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long addr) | |
2311 | { | |
2312 | struct mempolicy *pol; | |
c33d6c06 | 2313 | struct zoneref *z; |
771fb4d8 LS |
2314 | int curnid = page_to_nid(page); |
2315 | unsigned long pgoff; | |
90572890 PZ |
2316 | int thiscpu = raw_smp_processor_id(); |
2317 | int thisnid = cpu_to_node(thiscpu); | |
771fb4d8 LS |
2318 | int polnid = -1; |
2319 | int ret = -1; | |
2320 | ||
dd6eecb9 | 2321 | pol = get_vma_policy(vma, addr); |
771fb4d8 LS |
2322 | if (!(pol->flags & MPOL_F_MOF)) |
2323 | goto out; | |
2324 | ||
2325 | switch (pol->mode) { | |
2326 | case MPOL_INTERLEAVE: | |
771fb4d8 LS |
2327 | pgoff = vma->vm_pgoff; |
2328 | pgoff += (addr - vma->vm_start) >> PAGE_SHIFT; | |
98c70baa | 2329 | polnid = offset_il_node(pol, pgoff); |
771fb4d8 LS |
2330 | break; |
2331 | ||
2332 | case MPOL_PREFERRED: | |
2333 | if (pol->flags & MPOL_F_LOCAL) | |
2334 | polnid = numa_node_id(); | |
2335 | else | |
2336 | polnid = pol->v.preferred_node; | |
2337 | break; | |
2338 | ||
2339 | case MPOL_BIND: | |
c33d6c06 | 2340 | |
771fb4d8 LS |
2341 | /* |
2342 | * allows binding to multiple nodes. | |
2343 | * use current page if in policy nodemask, | |
2344 | * else select nearest allowed node, if any. | |
2345 | * If no allowed nodes, use current [!misplaced]. | |
2346 | */ | |
2347 | if (node_isset(curnid, pol->v.nodes)) | |
2348 | goto out; | |
c33d6c06 | 2349 | z = first_zones_zonelist( |
771fb4d8 LS |
2350 | node_zonelist(numa_node_id(), GFP_HIGHUSER), |
2351 | gfp_zone(GFP_HIGHUSER), | |
c33d6c06 MG |
2352 | &pol->v.nodes); |
2353 | polnid = z->zone->node; | |
771fb4d8 LS |
2354 | break; |
2355 | ||
2356 | default: | |
2357 | BUG(); | |
2358 | } | |
5606e387 MG |
2359 | |
2360 | /* Migrate the page towards the node whose CPU is referencing it */ | |
e42c8ff2 | 2361 | if (pol->flags & MPOL_F_MORON) { |
90572890 | 2362 | polnid = thisnid; |
5606e387 | 2363 | |
10f39042 | 2364 | if (!should_numa_migrate_memory(current, page, curnid, thiscpu)) |
de1c9ce6 | 2365 | goto out; |
e42c8ff2 MG |
2366 | } |
2367 | ||
771fb4d8 LS |
2368 | if (curnid != polnid) |
2369 | ret = polnid; | |
2370 | out: | |
2371 | mpol_cond_put(pol); | |
2372 | ||
2373 | return ret; | |
2374 | } | |
2375 | ||
c11600e4 DR |
2376 | /* |
2377 | * Drop the (possibly final) reference to task->mempolicy. It needs to be | |
2378 | * dropped after task->mempolicy is set to NULL so that any allocation done as | |
2379 | * part of its kmem_cache_free(), such as by KASAN, doesn't reference a freed | |
2380 | * policy. | |
2381 | */ | |
2382 | void mpol_put_task_policy(struct task_struct *task) | |
2383 | { | |
2384 | struct mempolicy *pol; | |
2385 | ||
2386 | task_lock(task); | |
2387 | pol = task->mempolicy; | |
2388 | task->mempolicy = NULL; | |
2389 | task_unlock(task); | |
2390 | mpol_put(pol); | |
2391 | } | |
2392 | ||
1da177e4 LT |
2393 | static void sp_delete(struct shared_policy *sp, struct sp_node *n) |
2394 | { | |
140d5a49 | 2395 | pr_debug("deleting %lx-l%lx\n", n->start, n->end); |
1da177e4 | 2396 | rb_erase(&n->nd, &sp->root); |
63f74ca2 | 2397 | sp_free(n); |
1da177e4 LT |
2398 | } |
2399 | ||
42288fe3 MG |
2400 | static void sp_node_init(struct sp_node *node, unsigned long start, |
2401 | unsigned long end, struct mempolicy *pol) | |
2402 | { | |
2403 | node->start = start; | |
2404 | node->end = end; | |
2405 | node->policy = pol; | |
2406 | } | |
2407 | ||
dbcb0f19 AB |
2408 | static struct sp_node *sp_alloc(unsigned long start, unsigned long end, |
2409 | struct mempolicy *pol) | |
1da177e4 | 2410 | { |
869833f2 KM |
2411 | struct sp_node *n; |
2412 | struct mempolicy *newpol; | |
1da177e4 | 2413 | |
869833f2 | 2414 | n = kmem_cache_alloc(sn_cache, GFP_KERNEL); |
1da177e4 LT |
2415 | if (!n) |
2416 | return NULL; | |
869833f2 KM |
2417 | |
2418 | newpol = mpol_dup(pol); | |
2419 | if (IS_ERR(newpol)) { | |
2420 | kmem_cache_free(sn_cache, n); | |
2421 | return NULL; | |
2422 | } | |
2423 | newpol->flags |= MPOL_F_SHARED; | |
42288fe3 | 2424 | sp_node_init(n, start, end, newpol); |
869833f2 | 2425 | |
1da177e4 LT |
2426 | return n; |
2427 | } | |
2428 | ||
2429 | /* Replace a policy range. */ | |
2430 | static int shared_policy_replace(struct shared_policy *sp, unsigned long start, | |
2431 | unsigned long end, struct sp_node *new) | |
2432 | { | |
b22d127a | 2433 | struct sp_node *n; |
42288fe3 MG |
2434 | struct sp_node *n_new = NULL; |
2435 | struct mempolicy *mpol_new = NULL; | |
b22d127a | 2436 | int ret = 0; |
1da177e4 | 2437 | |
42288fe3 | 2438 | restart: |
4a8c7bb5 | 2439 | write_lock(&sp->lock); |
1da177e4 LT |
2440 | n = sp_lookup(sp, start, end); |
2441 | /* Take care of old policies in the same range. */ | |
2442 | while (n && n->start < end) { | |
2443 | struct rb_node *next = rb_next(&n->nd); | |
2444 | if (n->start >= start) { | |
2445 | if (n->end <= end) | |
2446 | sp_delete(sp, n); | |
2447 | else | |
2448 | n->start = end; | |
2449 | } else { | |
2450 | /* Old policy spanning whole new range. */ | |
2451 | if (n->end > end) { | |
42288fe3 MG |
2452 | if (!n_new) |
2453 | goto alloc_new; | |
2454 | ||
2455 | *mpol_new = *n->policy; | |
2456 | atomic_set(&mpol_new->refcnt, 1); | |
7880639c | 2457 | sp_node_init(n_new, end, n->end, mpol_new); |
1da177e4 | 2458 | n->end = start; |
5ca39575 | 2459 | sp_insert(sp, n_new); |
42288fe3 MG |
2460 | n_new = NULL; |
2461 | mpol_new = NULL; | |
1da177e4 LT |
2462 | break; |
2463 | } else | |
2464 | n->end = start; | |
2465 | } | |
2466 | if (!next) | |
2467 | break; | |
2468 | n = rb_entry(next, struct sp_node, nd); | |
2469 | } | |
2470 | if (new) | |
2471 | sp_insert(sp, new); | |
4a8c7bb5 | 2472 | write_unlock(&sp->lock); |
42288fe3 MG |
2473 | ret = 0; |
2474 | ||
2475 | err_out: | |
2476 | if (mpol_new) | |
2477 | mpol_put(mpol_new); | |
2478 | if (n_new) | |
2479 | kmem_cache_free(sn_cache, n_new); | |
2480 | ||
b22d127a | 2481 | return ret; |
42288fe3 MG |
2482 | |
2483 | alloc_new: | |
4a8c7bb5 | 2484 | write_unlock(&sp->lock); |
42288fe3 MG |
2485 | ret = -ENOMEM; |
2486 | n_new = kmem_cache_alloc(sn_cache, GFP_KERNEL); | |
2487 | if (!n_new) | |
2488 | goto err_out; | |
2489 | mpol_new = kmem_cache_alloc(policy_cache, GFP_KERNEL); | |
2490 | if (!mpol_new) | |
2491 | goto err_out; | |
2492 | goto restart; | |
1da177e4 LT |
2493 | } |
2494 | ||
71fe804b LS |
2495 | /** |
2496 | * mpol_shared_policy_init - initialize shared policy for inode | |
2497 | * @sp: pointer to inode shared policy | |
2498 | * @mpol: struct mempolicy to install | |
2499 | * | |
2500 | * Install non-NULL @mpol in inode's shared policy rb-tree. | |
2501 | * On entry, the current task has a reference on a non-NULL @mpol. | |
2502 | * This must be released on exit. | |
4bfc4495 | 2503 | * This is called at get_inode() calls and we can use GFP_KERNEL. |
71fe804b LS |
2504 | */ |
2505 | void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol) | |
2506 | { | |
58568d2a MX |
2507 | int ret; |
2508 | ||
71fe804b | 2509 | sp->root = RB_ROOT; /* empty tree == default mempolicy */ |
4a8c7bb5 | 2510 | rwlock_init(&sp->lock); |
71fe804b LS |
2511 | |
2512 | if (mpol) { | |
2513 | struct vm_area_struct pvma; | |
2514 | struct mempolicy *new; | |
4bfc4495 | 2515 | NODEMASK_SCRATCH(scratch); |
71fe804b | 2516 | |
4bfc4495 | 2517 | if (!scratch) |
5c0c1654 | 2518 | goto put_mpol; |
71fe804b LS |
2519 | /* contextualize the tmpfs mount point mempolicy */ |
2520 | new = mpol_new(mpol->mode, mpol->flags, &mpol->w.user_nodemask); | |
15d77835 | 2521 | if (IS_ERR(new)) |
0cae3457 | 2522 | goto free_scratch; /* no valid nodemask intersection */ |
58568d2a MX |
2523 | |
2524 | task_lock(current); | |
4bfc4495 | 2525 | ret = mpol_set_nodemask(new, &mpol->w.user_nodemask, scratch); |
58568d2a | 2526 | task_unlock(current); |
15d77835 | 2527 | if (ret) |
5c0c1654 | 2528 | goto put_new; |
71fe804b LS |
2529 | |
2530 | /* Create pseudo-vma that contains just the policy */ | |
2531 | memset(&pvma, 0, sizeof(struct vm_area_struct)); | |
2532 | pvma.vm_end = TASK_SIZE; /* policy covers entire file */ | |
2533 | mpol_set_shared_policy(sp, &pvma, new); /* adds ref */ | |
15d77835 | 2534 | |
5c0c1654 | 2535 | put_new: |
71fe804b | 2536 | mpol_put(new); /* drop initial ref */ |
0cae3457 | 2537 | free_scratch: |
4bfc4495 | 2538 | NODEMASK_SCRATCH_FREE(scratch); |
5c0c1654 LS |
2539 | put_mpol: |
2540 | mpol_put(mpol); /* drop our incoming ref on sb mpol */ | |
7339ff83 RH |
2541 | } |
2542 | } | |
2543 | ||
1da177e4 LT |
2544 | int mpol_set_shared_policy(struct shared_policy *info, |
2545 | struct vm_area_struct *vma, struct mempolicy *npol) | |
2546 | { | |
2547 | int err; | |
2548 | struct sp_node *new = NULL; | |
2549 | unsigned long sz = vma_pages(vma); | |
2550 | ||
028fec41 | 2551 | pr_debug("set_shared_policy %lx sz %lu %d %d %lx\n", |
1da177e4 | 2552 | vma->vm_pgoff, |
45c4745a | 2553 | sz, npol ? npol->mode : -1, |
028fec41 | 2554 | npol ? npol->flags : -1, |
00ef2d2f | 2555 | npol ? nodes_addr(npol->v.nodes)[0] : NUMA_NO_NODE); |
1da177e4 LT |
2556 | |
2557 | if (npol) { | |
2558 | new = sp_alloc(vma->vm_pgoff, vma->vm_pgoff + sz, npol); | |
2559 | if (!new) | |
2560 | return -ENOMEM; | |
2561 | } | |
2562 | err = shared_policy_replace(info, vma->vm_pgoff, vma->vm_pgoff+sz, new); | |
2563 | if (err && new) | |
63f74ca2 | 2564 | sp_free(new); |
1da177e4 LT |
2565 | return err; |
2566 | } | |
2567 | ||
2568 | /* Free a backing policy store on inode delete. */ | |
2569 | void mpol_free_shared_policy(struct shared_policy *p) | |
2570 | { | |
2571 | struct sp_node *n; | |
2572 | struct rb_node *next; | |
2573 | ||
2574 | if (!p->root.rb_node) | |
2575 | return; | |
4a8c7bb5 | 2576 | write_lock(&p->lock); |
1da177e4 LT |
2577 | next = rb_first(&p->root); |
2578 | while (next) { | |
2579 | n = rb_entry(next, struct sp_node, nd); | |
2580 | next = rb_next(&n->nd); | |
63f74ca2 | 2581 | sp_delete(p, n); |
1da177e4 | 2582 | } |
4a8c7bb5 | 2583 | write_unlock(&p->lock); |
1da177e4 LT |
2584 | } |
2585 | ||
1a687c2e | 2586 | #ifdef CONFIG_NUMA_BALANCING |
c297663c | 2587 | static int __initdata numabalancing_override; |
1a687c2e MG |
2588 | |
2589 | static void __init check_numabalancing_enable(void) | |
2590 | { | |
2591 | bool numabalancing_default = false; | |
2592 | ||
2593 | if (IS_ENABLED(CONFIG_NUMA_BALANCING_DEFAULT_ENABLED)) | |
2594 | numabalancing_default = true; | |
2595 | ||
c297663c MG |
2596 | /* Parsed by setup_numabalancing. override == 1 enables, -1 disables */ |
2597 | if (numabalancing_override) | |
2598 | set_numabalancing_state(numabalancing_override == 1); | |
2599 | ||
b0dc2b9b | 2600 | if (num_online_nodes() > 1 && !numabalancing_override) { |
756a025f | 2601 | pr_info("%s automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl\n", |
c297663c | 2602 | numabalancing_default ? "Enabling" : "Disabling"); |
1a687c2e MG |
2603 | set_numabalancing_state(numabalancing_default); |
2604 | } | |
2605 | } | |
2606 | ||
2607 | static int __init setup_numabalancing(char *str) | |
2608 | { | |
2609 | int ret = 0; | |
2610 | if (!str) | |
2611 | goto out; | |
1a687c2e MG |
2612 | |
2613 | if (!strcmp(str, "enable")) { | |
c297663c | 2614 | numabalancing_override = 1; |
1a687c2e MG |
2615 | ret = 1; |
2616 | } else if (!strcmp(str, "disable")) { | |
c297663c | 2617 | numabalancing_override = -1; |
1a687c2e MG |
2618 | ret = 1; |
2619 | } | |
2620 | out: | |
2621 | if (!ret) | |
4a404bea | 2622 | pr_warn("Unable to parse numa_balancing=\n"); |
1a687c2e MG |
2623 | |
2624 | return ret; | |
2625 | } | |
2626 | __setup("numa_balancing=", setup_numabalancing); | |
2627 | #else | |
2628 | static inline void __init check_numabalancing_enable(void) | |
2629 | { | |
2630 | } | |
2631 | #endif /* CONFIG_NUMA_BALANCING */ | |
2632 | ||
1da177e4 LT |
2633 | /* assumes fs == KERNEL_DS */ |
2634 | void __init numa_policy_init(void) | |
2635 | { | |
b71636e2 PM |
2636 | nodemask_t interleave_nodes; |
2637 | unsigned long largest = 0; | |
2638 | int nid, prefer = 0; | |
2639 | ||
1da177e4 LT |
2640 | policy_cache = kmem_cache_create("numa_policy", |
2641 | sizeof(struct mempolicy), | |
20c2df83 | 2642 | 0, SLAB_PANIC, NULL); |
1da177e4 LT |
2643 | |
2644 | sn_cache = kmem_cache_create("shared_policy_node", | |
2645 | sizeof(struct sp_node), | |
20c2df83 | 2646 | 0, SLAB_PANIC, NULL); |
1da177e4 | 2647 | |
5606e387 MG |
2648 | for_each_node(nid) { |
2649 | preferred_node_policy[nid] = (struct mempolicy) { | |
2650 | .refcnt = ATOMIC_INIT(1), | |
2651 | .mode = MPOL_PREFERRED, | |
2652 | .flags = MPOL_F_MOF | MPOL_F_MORON, | |
2653 | .v = { .preferred_node = nid, }, | |
2654 | }; | |
2655 | } | |
2656 | ||
b71636e2 PM |
2657 | /* |
2658 | * Set interleaving policy for system init. Interleaving is only | |
2659 | * enabled across suitably sized nodes (default is >= 16MB), or | |
2660 | * fall back to the largest node if they're all smaller. | |
2661 | */ | |
2662 | nodes_clear(interleave_nodes); | |
01f13bd6 | 2663 | for_each_node_state(nid, N_MEMORY) { |
b71636e2 PM |
2664 | unsigned long total_pages = node_present_pages(nid); |
2665 | ||
2666 | /* Preserve the largest node */ | |
2667 | if (largest < total_pages) { | |
2668 | largest = total_pages; | |
2669 | prefer = nid; | |
2670 | } | |
2671 | ||
2672 | /* Interleave this node? */ | |
2673 | if ((total_pages << PAGE_SHIFT) >= (16 << 20)) | |
2674 | node_set(nid, interleave_nodes); | |
2675 | } | |
2676 | ||
2677 | /* All too small, use the largest */ | |
2678 | if (unlikely(nodes_empty(interleave_nodes))) | |
2679 | node_set(prefer, interleave_nodes); | |
1da177e4 | 2680 | |
028fec41 | 2681 | if (do_set_mempolicy(MPOL_INTERLEAVE, 0, &interleave_nodes)) |
b1de0d13 | 2682 | pr_err("%s: interleaving failed\n", __func__); |
1a687c2e MG |
2683 | |
2684 | check_numabalancing_enable(); | |
1da177e4 LT |
2685 | } |
2686 | ||
8bccd85f | 2687 | /* Reset policy of current process to default */ |
1da177e4 LT |
2688 | void numa_default_policy(void) |
2689 | { | |
028fec41 | 2690 | do_set_mempolicy(MPOL_DEFAULT, 0, NULL); |
1da177e4 | 2691 | } |
68860ec1 | 2692 | |
095f1fc4 LS |
2693 | /* |
2694 | * Parse and format mempolicy from/to strings | |
2695 | */ | |
2696 | ||
1a75a6c8 | 2697 | /* |
f2a07f40 | 2698 | * "local" is implemented internally by MPOL_PREFERRED with MPOL_F_LOCAL flag. |
1a75a6c8 | 2699 | */ |
345ace9c LS |
2700 | static const char * const policy_modes[] = |
2701 | { | |
2702 | [MPOL_DEFAULT] = "default", | |
2703 | [MPOL_PREFERRED] = "prefer", | |
2704 | [MPOL_BIND] = "bind", | |
2705 | [MPOL_INTERLEAVE] = "interleave", | |
d3a71033 | 2706 | [MPOL_LOCAL] = "local", |
345ace9c | 2707 | }; |
1a75a6c8 | 2708 | |
095f1fc4 LS |
2709 | |
2710 | #ifdef CONFIG_TMPFS | |
2711 | /** | |
f2a07f40 | 2712 | * mpol_parse_str - parse string to mempolicy, for tmpfs mpol mount option. |
095f1fc4 | 2713 | * @str: string containing mempolicy to parse |
71fe804b | 2714 | * @mpol: pointer to struct mempolicy pointer, returned on success. |
095f1fc4 LS |
2715 | * |
2716 | * Format of input: | |
2717 | * <mode>[=<flags>][:<nodelist>] | |
2718 | * | |
71fe804b | 2719 | * On success, returns 0, else 1 |
095f1fc4 | 2720 | */ |
a7a88b23 | 2721 | int mpol_parse_str(char *str, struct mempolicy **mpol) |
095f1fc4 | 2722 | { |
71fe804b | 2723 | struct mempolicy *new = NULL; |
b4652e84 | 2724 | unsigned short mode; |
f2a07f40 | 2725 | unsigned short mode_flags; |
71fe804b | 2726 | nodemask_t nodes; |
095f1fc4 LS |
2727 | char *nodelist = strchr(str, ':'); |
2728 | char *flags = strchr(str, '='); | |
095f1fc4 LS |
2729 | int err = 1; |
2730 | ||
2731 | if (nodelist) { | |
2732 | /* NUL-terminate mode or flags string */ | |
2733 | *nodelist++ = '\0'; | |
71fe804b | 2734 | if (nodelist_parse(nodelist, nodes)) |
095f1fc4 | 2735 | goto out; |
01f13bd6 | 2736 | if (!nodes_subset(nodes, node_states[N_MEMORY])) |
095f1fc4 | 2737 | goto out; |
71fe804b LS |
2738 | } else |
2739 | nodes_clear(nodes); | |
2740 | ||
095f1fc4 LS |
2741 | if (flags) |
2742 | *flags++ = '\0'; /* terminate mode string */ | |
2743 | ||
479e2802 | 2744 | for (mode = 0; mode < MPOL_MAX; mode++) { |
345ace9c | 2745 | if (!strcmp(str, policy_modes[mode])) { |
095f1fc4 LS |
2746 | break; |
2747 | } | |
2748 | } | |
a720094d | 2749 | if (mode >= MPOL_MAX) |
095f1fc4 LS |
2750 | goto out; |
2751 | ||
71fe804b | 2752 | switch (mode) { |
095f1fc4 | 2753 | case MPOL_PREFERRED: |
71fe804b LS |
2754 | /* |
2755 | * Insist on a nodelist of one node only | |
2756 | */ | |
095f1fc4 LS |
2757 | if (nodelist) { |
2758 | char *rest = nodelist; | |
2759 | while (isdigit(*rest)) | |
2760 | rest++; | |
926f2ae0 KM |
2761 | if (*rest) |
2762 | goto out; | |
095f1fc4 LS |
2763 | } |
2764 | break; | |
095f1fc4 LS |
2765 | case MPOL_INTERLEAVE: |
2766 | /* | |
2767 | * Default to online nodes with memory if no nodelist | |
2768 | */ | |
2769 | if (!nodelist) | |
01f13bd6 | 2770 | nodes = node_states[N_MEMORY]; |
3f226aa1 | 2771 | break; |
71fe804b | 2772 | case MPOL_LOCAL: |
3f226aa1 | 2773 | /* |
71fe804b | 2774 | * Don't allow a nodelist; mpol_new() checks flags |
3f226aa1 | 2775 | */ |
71fe804b | 2776 | if (nodelist) |
3f226aa1 | 2777 | goto out; |
71fe804b | 2778 | mode = MPOL_PREFERRED; |
3f226aa1 | 2779 | break; |
413b43de RT |
2780 | case MPOL_DEFAULT: |
2781 | /* | |
2782 | * Insist on a empty nodelist | |
2783 | */ | |
2784 | if (!nodelist) | |
2785 | err = 0; | |
2786 | goto out; | |
d69b2e63 KM |
2787 | case MPOL_BIND: |
2788 | /* | |
2789 | * Insist on a nodelist | |
2790 | */ | |
2791 | if (!nodelist) | |
2792 | goto out; | |
095f1fc4 LS |
2793 | } |
2794 | ||
71fe804b | 2795 | mode_flags = 0; |
095f1fc4 LS |
2796 | if (flags) { |
2797 | /* | |
2798 | * Currently, we only support two mutually exclusive | |
2799 | * mode flags. | |
2800 | */ | |
2801 | if (!strcmp(flags, "static")) | |
71fe804b | 2802 | mode_flags |= MPOL_F_STATIC_NODES; |
095f1fc4 | 2803 | else if (!strcmp(flags, "relative")) |
71fe804b | 2804 | mode_flags |= MPOL_F_RELATIVE_NODES; |
095f1fc4 | 2805 | else |
926f2ae0 | 2806 | goto out; |
095f1fc4 | 2807 | } |
71fe804b LS |
2808 | |
2809 | new = mpol_new(mode, mode_flags, &nodes); | |
2810 | if (IS_ERR(new)) | |
926f2ae0 KM |
2811 | goto out; |
2812 | ||
f2a07f40 HD |
2813 | /* |
2814 | * Save nodes for mpol_to_str() to show the tmpfs mount options | |
2815 | * for /proc/mounts, /proc/pid/mounts and /proc/pid/mountinfo. | |
2816 | */ | |
2817 | if (mode != MPOL_PREFERRED) | |
2818 | new->v.nodes = nodes; | |
2819 | else if (nodelist) | |
2820 | new->v.preferred_node = first_node(nodes); | |
2821 | else | |
2822 | new->flags |= MPOL_F_LOCAL; | |
2823 | ||
2824 | /* | |
2825 | * Save nodes for contextualization: this will be used to "clone" | |
2826 | * the mempolicy in a specific context [cpuset] at a later time. | |
2827 | */ | |
2828 | new->w.user_nodemask = nodes; | |
2829 | ||
926f2ae0 | 2830 | err = 0; |
71fe804b | 2831 | |
095f1fc4 LS |
2832 | out: |
2833 | /* Restore string for error message */ | |
2834 | if (nodelist) | |
2835 | *--nodelist = ':'; | |
2836 | if (flags) | |
2837 | *--flags = '='; | |
71fe804b LS |
2838 | if (!err) |
2839 | *mpol = new; | |
095f1fc4 LS |
2840 | return err; |
2841 | } | |
2842 | #endif /* CONFIG_TMPFS */ | |
2843 | ||
71fe804b LS |
2844 | /** |
2845 | * mpol_to_str - format a mempolicy structure for printing | |
2846 | * @buffer: to contain formatted mempolicy string | |
2847 | * @maxlen: length of @buffer | |
2848 | * @pol: pointer to mempolicy to be formatted | |
71fe804b | 2849 | * |
948927ee DR |
2850 | * Convert @pol into a string. If @buffer is too short, truncate the string. |
2851 | * Recommend a @maxlen of at least 32 for the longest mode, "interleave", the | |
2852 | * longest flag, "relative", and to display at least a few node ids. | |
1a75a6c8 | 2853 | */ |
948927ee | 2854 | void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol) |
1a75a6c8 CL |
2855 | { |
2856 | char *p = buffer; | |
948927ee DR |
2857 | nodemask_t nodes = NODE_MASK_NONE; |
2858 | unsigned short mode = MPOL_DEFAULT; | |
2859 | unsigned short flags = 0; | |
2291990a | 2860 | |
8790c71a | 2861 | if (pol && pol != &default_policy && !(pol->flags & MPOL_F_MORON)) { |
bea904d5 | 2862 | mode = pol->mode; |
948927ee DR |
2863 | flags = pol->flags; |
2864 | } | |
bea904d5 | 2865 | |
1a75a6c8 CL |
2866 | switch (mode) { |
2867 | case MPOL_DEFAULT: | |
1a75a6c8 | 2868 | break; |
1a75a6c8 | 2869 | case MPOL_PREFERRED: |
fc36b8d3 | 2870 | if (flags & MPOL_F_LOCAL) |
f2a07f40 | 2871 | mode = MPOL_LOCAL; |
53f2556b | 2872 | else |
fc36b8d3 | 2873 | node_set(pol->v.preferred_node, nodes); |
1a75a6c8 | 2874 | break; |
1a75a6c8 | 2875 | case MPOL_BIND: |
1a75a6c8 | 2876 | case MPOL_INTERLEAVE: |
f2a07f40 | 2877 | nodes = pol->v.nodes; |
1a75a6c8 | 2878 | break; |
1a75a6c8 | 2879 | default: |
948927ee DR |
2880 | WARN_ON_ONCE(1); |
2881 | snprintf(p, maxlen, "unknown"); | |
2882 | return; | |
1a75a6c8 CL |
2883 | } |
2884 | ||
b7a9f420 | 2885 | p += snprintf(p, maxlen, "%s", policy_modes[mode]); |
1a75a6c8 | 2886 | |
fc36b8d3 | 2887 | if (flags & MPOL_MODE_FLAGS) { |
948927ee | 2888 | p += snprintf(p, buffer + maxlen - p, "="); |
f5b087b5 | 2889 | |
2291990a LS |
2890 | /* |
2891 | * Currently, the only defined flags are mutually exclusive | |
2892 | */ | |
f5b087b5 | 2893 | if (flags & MPOL_F_STATIC_NODES) |
2291990a LS |
2894 | p += snprintf(p, buffer + maxlen - p, "static"); |
2895 | else if (flags & MPOL_F_RELATIVE_NODES) | |
2896 | p += snprintf(p, buffer + maxlen - p, "relative"); | |
f5b087b5 DR |
2897 | } |
2898 | ||
9e763e0f TH |
2899 | if (!nodes_empty(nodes)) |
2900 | p += scnprintf(p, buffer + maxlen - p, ":%*pbl", | |
2901 | nodemask_pr_args(&nodes)); | |
1a75a6c8 | 2902 | } |