[mirror_ubuntu-artful-kernel.git] / include / linux / vmacache.h

#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.vmas, 0, sizeof(tsk->vmacache.vmas));
}

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 */
Commit	Line	Data
615d6e87 DB	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
	13	static inline void vmacache_flush(struct task_struct *tsk)
	14	{
314ff785	15	memset(tsk->vmacache.vmas, 0, sizeof(tsk->vmacache.vmas));
615d6e87 DB	16	}
	17
	18	extern void vmacache_flush_all(struct mm_struct *mm);
	19	extern void vmacache_update(unsigned long addr, struct vm_area_struct *newvma);
	20	extern struct vm_area_struct vmacache_find(struct mm_struct mm,
	21	unsigned long addr);
	22
	23	#ifndef CONFIG_MMU
	24	extern struct vm_area_struct vmacache_find_exact(struct mm_struct mm,
	25	unsigned long start,
	26	unsigned long end);
	27	#endif
	28
	29	static 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 */