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_update(unsigned long addr, struct vm_area_struct *newvma);
  20 extern struct vm_area_struct *vmacache_find(struct mm_struct *mm,
  21                                                     unsigned long addr);
  22
  23 #ifndef CONFIG_MMU
  24 extern struct vm_area_struct *vmacache_find_exact(struct mm_struct *mm,
  25                                                   unsigned long start,
  26                                                   unsigned long end);
  27 #endif
  28
  29 static inline void vmacache_invalidate(struct mm_struct *mm)
  30 {
  31         mm->vmacache_seqnum++;
  32 }
  33
  34 #endif /* __LINUX_VMACACHE_H */