*/
static DEFINE_SPINLOCK(cgroup_file_kn_lock);
-struct percpu_rw_semaphore cgroup_threadgroup_rwsem;
+DEFINE_PERCPU_RWSEM(cgroup_threadgroup_rwsem);
#define cgroup_assert_mutex_or_rcu_locked() \
RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \
static int cgroup_apply_control(struct cgroup *cgrp);
static void cgroup_finalize_control(struct cgroup *cgrp, int ret);
-static void css_task_iter_advance(struct css_task_iter *it);
+static void css_task_iter_skip(struct css_task_iter *it,
+ struct task_struct *task);
static int cgroup_destroy_locked(struct cgroup *cgrp);
static struct cgroup_subsys_state *css_create(struct cgroup *cgrp,
struct cgroup_subsys *ss);
.dom_cset = &init_css_set,
.tasks = LIST_HEAD_INIT(init_css_set.tasks),
.mg_tasks = LIST_HEAD_INIT(init_css_set.mg_tasks),
+ .dying_tasks = LIST_HEAD_INIT(init_css_set.dying_tasks),
.task_iters = LIST_HEAD_INIT(init_css_set.task_iters),
.threaded_csets = LIST_HEAD_INIT(init_css_set.threaded_csets),
.cgrp_links = LIST_HEAD_INIT(init_css_set.cgrp_links),
cgroup_update_populated(link->cgrp, populated);
}
+/*
+ * @task is leaving, advance task iterators which are pointing to it so
+ * that they can resume at the next position. Advancing an iterator might
+ * remove it from the list, use safe walk. See css_task_iter_skip() for
+ * details.
+ */
+static void css_set_skip_task_iters(struct css_set *cset,
+ struct task_struct *task)
+{
+ struct css_task_iter *it, *pos;
+
+ list_for_each_entry_safe(it, pos, &cset->task_iters, iters_node)
+ css_task_iter_skip(it, task);
+}
+
/**
* css_set_move_task - move a task from one css_set to another
* @task: task being moved
css_set_update_populated(to_cset, true);
if (from_cset) {
- struct css_task_iter *it, *pos;
-
WARN_ON_ONCE(list_empty(&task->cg_list));
- /*
- * @task is leaving, advance task iterators which are
- * pointing to it so that they can resume at the next
- * position. Advancing an iterator might remove it from
- * the list, use safe walk. See css_task_iter_advance*()
- * for details.
- */
- list_for_each_entry_safe(it, pos, &from_cset->task_iters,
- iters_node)
- if (it->task_pos == &task->cg_list)
- css_task_iter_advance(it);
-
+ css_set_skip_task_iters(from_cset, task);
list_del_init(&task->cg_list);
if (!css_set_populated(from_cset))
css_set_update_populated(from_cset, false);
cset->dom_cset = cset;
INIT_LIST_HEAD(&cset->tasks);
INIT_LIST_HEAD(&cset->mg_tasks);
+ INIT_LIST_HEAD(&cset->dying_tasks);
INIT_LIST_HEAD(&cset->task_iters);
INIT_LIST_HEAD(&cset->threaded_csets);
INIT_HLIST_NODE(&cset->hlist);
enum cgroup2_param {
Opt_nsdelegate,
+ Opt_memory_localevents,
nr__cgroup2_params
};
static const struct fs_parameter_spec cgroup2_param_specs[] = {
- fsparam_flag ("nsdelegate", Opt_nsdelegate),
+ fsparam_flag("nsdelegate", Opt_nsdelegate),
+ fsparam_flag("memory_localevents", Opt_memory_localevents),
{}
};
case Opt_nsdelegate:
ctx->flags |= CGRP_ROOT_NS_DELEGATE;
return 0;
+ case Opt_memory_localevents:
+ ctx->flags |= CGRP_ROOT_MEMORY_LOCAL_EVENTS;
+ return 0;
}
return -EINVAL;
}
cgrp_dfl_root.flags |= CGRP_ROOT_NS_DELEGATE;
else
cgrp_dfl_root.flags &= ~CGRP_ROOT_NS_DELEGATE;
+
+ if (root_flags & CGRP_ROOT_MEMORY_LOCAL_EVENTS)
+ cgrp_dfl_root.flags |= CGRP_ROOT_MEMORY_LOCAL_EVENTS;
+ else
+ cgrp_dfl_root.flags &= ~CGRP_ROOT_MEMORY_LOCAL_EVENTS;
}
}
{
if (cgrp_dfl_root.flags & CGRP_ROOT_NS_DELEGATE)
seq_puts(seq, ",nsdelegate");
+ if (cgrp_dfl_root.flags & CGRP_ROOT_MEMORY_LOCAL_EVENTS)
+ seq_puts(seq, ",memory_localevents");
return 0;
}
return NULL;
}
+EXPORT_SYMBOL_GPL(css_next_descendant_pre);
/**
* css_rightmost_descendant - return the rightmost descendant of a css
it->task_pos = NULL;
return;
}
- } while (!css_set_populated(cset));
+ } while (!css_set_populated(cset) && list_empty(&cset->dying_tasks));
if (!list_empty(&cset->tasks))
it->task_pos = cset->tasks.next;
- else
+ else if (!list_empty(&cset->mg_tasks))
it->task_pos = cset->mg_tasks.next;
+ else
+ it->task_pos = cset->dying_tasks.next;
it->tasks_head = &cset->tasks;
it->mg_tasks_head = &cset->mg_tasks;
+ it->dying_tasks_head = &cset->dying_tasks;
/*
* We don't keep css_sets locked across iteration steps and thus
list_add(&it->iters_node, &cset->task_iters);
}
+static void css_task_iter_skip(struct css_task_iter *it,
+ struct task_struct *task)
+{
+ lockdep_assert_held(&css_set_lock);
+
+ if (it->task_pos == &task->cg_list) {
+ it->task_pos = it->task_pos->next;
+ it->flags |= CSS_TASK_ITER_SKIPPED;
+ }
+}
+
static void css_task_iter_advance(struct css_task_iter *it)
{
- struct list_head *next;
+ struct task_struct *task;
lockdep_assert_held(&css_set_lock);
repeat:
* consumed first and then ->mg_tasks. After ->mg_tasks,
* we move onto the next cset.
*/
- next = it->task_pos->next;
-
- if (next == it->tasks_head)
- next = it->mg_tasks_head->next;
+ if (it->flags & CSS_TASK_ITER_SKIPPED)
+ it->flags &= ~CSS_TASK_ITER_SKIPPED;
+ else
+ it->task_pos = it->task_pos->next;
- if (next == it->mg_tasks_head)
+ if (it->task_pos == it->tasks_head)
+ it->task_pos = it->mg_tasks_head->next;
+ if (it->task_pos == it->mg_tasks_head)
+ it->task_pos = it->dying_tasks_head->next;
+ if (it->task_pos == it->dying_tasks_head)
css_task_iter_advance_css_set(it);
- else
- it->task_pos = next;
} else {
/* called from start, proceed to the first cset */
css_task_iter_advance_css_set(it);
}
- /* if PROCS, skip over tasks which aren't group leaders */
- if ((it->flags & CSS_TASK_ITER_PROCS) && it->task_pos &&
- !thread_group_leader(list_entry(it->task_pos, struct task_struct,
- cg_list)))
- goto repeat;
+ if (!it->task_pos)
+ return;
+
+ task = list_entry(it->task_pos, struct task_struct, cg_list);
+
+ if (it->flags & CSS_TASK_ITER_PROCS) {
+ /* if PROCS, skip over tasks which aren't group leaders */
+ if (!thread_group_leader(task))
+ goto repeat;
+
+ /* and dying leaders w/o live member threads */
+ if (!atomic_read(&task->signal->live))
+ goto repeat;
+ } else {
+ /* skip all dying ones */
+ if (task->flags & PF_EXITING)
+ goto repeat;
+ }
}
/**
spin_lock_irq(&css_set_lock);
+ /* @it may be half-advanced by skips, finish advancing */
+ if (it->flags & CSS_TASK_ITER_SKIPPED)
+ css_task_iter_advance(it);
+
if (it->task_pos) {
it->cur_task = list_entry(it->task_pos, struct task_struct,
cg_list);
if (cgrp->kn)
RCU_INIT_POINTER(*(void __rcu __force **)&cgrp->kn->priv,
NULL);
-
- cgroup_bpf_put(cgrp);
}
mutex_unlock(&cgroup_mutex);
cgroup1_check_for_release(parent);
+ cgroup_bpf_offline(cgrp);
+
/* put the base reference */
percpu_ref_kill(&cgrp->self.refcnt);
int ssid;
BUILD_BUG_ON(CGROUP_SUBSYS_COUNT > 16);
- BUG_ON(percpu_init_rwsem(&cgroup_threadgroup_rwsem));
BUG_ON(cgroup_init_cftypes(NULL, cgroup_base_files));
BUG_ON(cgroup_init_cftypes(NULL, cgroup1_base_files));
if (!list_empty(&tsk->cg_list)) {
spin_lock_irq(&css_set_lock);
css_set_move_task(tsk, cset, NULL, false);
+ list_add_tail(&tsk->cg_list, &cset->dying_tasks);
cset->nr_tasks--;
WARN_ON_ONCE(cgroup_task_frozen(tsk));
do_each_subsys_mask(ss, ssid, have_release_callback) {
ss->release(task);
} while_each_subsys_mask();
+
+ if (use_task_css_set_links) {
+ spin_lock_irq(&css_set_lock);
+ css_set_skip_task_iters(task_css_set(task), task);
+ list_del_init(&task->cg_list);
+ spin_unlock_irq(&css_set_lock);
+ }
}
void cgroup_free(struct task_struct *task)
}
EXPORT_SYMBOL_GPL(cgroup_get_from_fd);
+static u64 power_of_ten(int power)
+{
+ u64 v = 1;
+ while (power--)
+ v *= 10;
+ return v;
+}
+
+/**
+ * cgroup_parse_float - parse a floating number
+ * @input: input string
+ * @dec_shift: number of decimal digits to shift
+ * @v: output
+ *
+ * Parse a decimal floating point number in @input and store the result in
+ * @v with decimal point right shifted @dec_shift times. For example, if
+ * @input is "12.3456" and @dec_shift is 3, *@v will be set to 12345.
+ * Returns 0 on success, -errno otherwise.
+ *
+ * There's nothing cgroup specific about this function except that it's
+ * currently the only user.
+ */
+int cgroup_parse_float(const char *input, unsigned dec_shift, s64 *v)
+{
+ s64 whole, frac = 0;
+ int fstart = 0, fend = 0, flen;
+
+ if (!sscanf(input, "%lld.%n%lld%n", &whole, &fstart, &frac, &fend))
+ return -EINVAL;
+ if (frac < 0)
+ return -EINVAL;
+
+ flen = fend > fstart ? fend - fstart : 0;
+ if (flen < dec_shift)
+ frac *= power_of_ten(dec_shift - flen);
+ else
+ frac = DIV_ROUND_CLOSEST_ULL(frac, power_of_ten(flen - dec_shift));
+
+ *v = whole * power_of_ten(dec_shift) + frac;
+ return 0;
+}
+
/*
* sock->sk_cgrp_data handling. For more info, see sock_cgroup_data
* definition in cgroup-defs.h.
* Don't use cgroup_get_live().
*/
cgroup_get(sock_cgroup_ptr(skcd));
+ cgroup_bpf_get(sock_cgroup_ptr(skcd));
return;
}
cset = task_css_set(current);
if (likely(cgroup_tryget(cset->dfl_cgrp))) {
skcd->val = (unsigned long)cset->dfl_cgrp;
+ cgroup_bpf_get(cset->dfl_cgrp);
break;
}
cpu_relax();
void cgroup_sk_free(struct sock_cgroup_data *skcd)
{
- cgroup_put(sock_cgroup_ptr(skcd));
+ struct cgroup *cgrp = sock_cgroup_ptr(skcd);
+
+ cgroup_bpf_put(cgrp);
+ cgroup_put(cgrp);
}
#endif /* CONFIG_SOCK_CGROUP_DATA */
static ssize_t features_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
- return snprintf(buf, PAGE_SIZE, "nsdelegate\n");
+ return snprintf(buf, PAGE_SIZE, "nsdelegate\nmemory_localevents\n");
}
static struct kobj_attribute cgroup_features_attr = __ATTR_RO(features);
return sysfs_create_group(kernel_kobj, &cgroup_sysfs_attr_group);
}
subsys_initcall(cgroup_sysfs_init);
+
#endif /* CONFIG_SYSFS */
projects / linux-2.6-block.git / blobdiff