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TOMOYO Linux Cross Reference
Linux/include/linux/vmacache.h

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  1 #ifndef __LINUX_VMACACHE_H
  2 #define __LINUX_VMACACHE_H
  3 
  4 #include <linux/sched.h>
  5 #include <linux/mm.h>
  6 
  7 /*
  8  * Hash based on the page number. Provides a good hit rate for
  9  * workloads with good locality and those with random accesses as well.
 10  */
 11 #define VMACACHE_HASH(addr) ((addr >> PAGE_SHIFT) & VMACACHE_MASK)
 12 
 13 static inline void vmacache_flush(struct task_struct *tsk)
 14 {
 15         memset(tsk->vmacache.vmas, 0, sizeof(tsk->vmacache.vmas));
 16 }
 17 
 18 extern void vmacache_flush_all(struct mm_struct *mm);
 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         /* deal with overflows */
 34         if (unlikely(mm->vmacache_seqnum == 0))
 35                 vmacache_flush_all(mm);
 36 }
 37 
 38 #endif /* __LINUX_VMACACHE_H */
 39 

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