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#ifndef __LINUX_VMACACHE_H
#define __LINUX_VMACACHE_H
#include <linux/sched.h>
#include <linux/mm.h>
/*
* Hash based on the page number. Provides a good hit rate for
* workloads with good locality and those with random accesses as well.
*/
#define VMACACHE_HASH(addr) ((addr >> PAGE_SHIFT) & VMACACHE_MASK)
static inline void vmacache_flush(struct task_struct *tsk)
{
memset(tsk->vmacache, 0, sizeof(tsk->vmacache));
}
extern void vmacache_flush_all(struct mm_struct *mm);
extern void vmacache_update(unsigned long addr, struct vm_area_struct *newvma);
extern struct vm_area_struct *vmacache_find(struct mm_struct *mm,
unsigned long addr);
#ifndef CONFIG_MMU
extern struct vm_area_struct *vmacache_find_exact(struct mm_struct *mm,
unsigned long start,
unsigned long end);
#endif
static inline void vmacache_invalidate(struct mm_struct *mm)
{
mm->vmacache_seqnum++;
/* deal with overflows */
if (unlikely(mm->vmacache_seqnum == 0))
vmacache_flush_all(mm);
}
#endif /* __LINUX_VMACACHE_H */