| #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 */ |
