projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 615d6e87 DB |
2 | #ifndef __LINUX_VMACACHE_H |
| 3 | #define __LINUX_VMACACHE_H | |
| 4 | ||
| 5 | #include <linux/sched.h> | |
| 6 | #include <linux/mm.h> | |
| 7 | ||
| 8 | /* | |
| 9 | * Hash based on the page number. Provides a good hit rate for | |
| 10 | * workloads with good locality and those with random accesses as well. | |
| 11 | */ | |
| 12 | #define VMACACHE_HASH(addr) ((addr >> PAGE_SHIFT) & VMACACHE_MASK) | |
| 13 | ||
| 14 | static inline void vmacache_flush(struct task_struct *tsk) | |
| 15 | { | |
| 314ff785 | 16 | memset(tsk->vmacache.vmas, 0, sizeof(tsk->vmacache.vmas)); |
| 615d6e87 DB |
17 | } |
| 18 | ||
| 19 | extern void vmacache_flush_all(struct mm_struct *mm); | |
| 20 | extern void vmacache_update(unsigned long addr, struct vm_area_struct *newvma); | |
| 21 | extern struct vm_area_struct *vmacache_find(struct mm_struct *mm, | |
| 22 | unsigned long addr); | |
| 23 | ||
| 24 | #ifndef CONFIG_MMU | |
| 25 | extern struct vm_area_struct *vmacache_find_exact(struct mm_struct *mm, | |
| 26 | unsigned long start, | |
| 27 | unsigned long end); | |
| 28 | #endif | |
| 29 | ||
| 30 | static inline void vmacache_invalidate(struct mm_struct *mm) | |
| 31 | { | |
| 32 | mm->vmacache_seqnum++; | |
| 33 | ||
| 34 | /* deal with overflows */ | |
| 35 | if (unlikely(mm->vmacache_seqnum == 0)) | |
| 36 | vmacache_flush_all(mm); | |
| 37 | } | |
| 38 | ||
| 39 | #endif /* __LINUX_VMACACHE_H */ |