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38 lines
1.0 KiB
38 lines
1.0 KiB
#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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