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[mirror_ubuntu-bionic-kernel.git] / include / linux / vmacache.h
1 /* SPDX-License-Identifier: GPL-2.0 */
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 {
16 memset(tsk->vmacache.vmas, 0, sizeof(tsk->vmacache.vmas));
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 */