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 13static inline void vmacache_flush(struct task_struct *tsk) 14{ 15 memset(tsk->vmacache, 0, sizeof(tsk->vmacache)); 16} 17 18extern void vmacache_flush_all(struct mm_struct *mm); 19extern void vmacache_update(unsigned long addr, struct vm_area_struct *newvma); 20extern struct vm_area_struct *vmacache_find(struct mm_struct *mm, 21 unsigned long addr); 22 23#ifndef CONFIG_MMU 24extern struct vm_area_struct *vmacache_find_exact(struct mm_struct *mm, 25 unsigned long start, 26 unsigned long end); 27#endif 28 29static 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