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