[linux-2.6-block.git] / include / linux / mm_types_task.h

#ifndef _LINUX_MM_TYPES_TASK_H
#define _LINUX_MM_TYPES_TASK_H

/*
 * Here are the definitions of the MM data types that are embedded in 'struct task_struct'.
 *
 * (These are defined separately to decouple sched.h from mm_types.h as much as possible.)
 */

#include <linux/types.h>
#include <linux/threads.h>
#include <linux/atomic.h>

#include <asm/page.h>

#define USE_SPLIT_PTE_PTLOCKS	(NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
#define USE_SPLIT_PMD_PTLOCKS	(USE_SPLIT_PTE_PTLOCKS && \
		IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK))
#define ALLOC_SPLIT_PTLOCKS	(SPINLOCK_SIZE > BITS_PER_LONG/8)

/*
 * The per task VMA cache array:
 */
#define VMACACHE_BITS 2
#define VMACACHE_SIZE (1U << VMACACHE_BITS)
#define VMACACHE_MASK (VMACACHE_SIZE - 1)

struct vmacache {
	u32 seqnum;
	struct vm_area_struct *vmas[VMACACHE_SIZE];
};

enum {
	MM_FILEPAGES,	/* Resident file mapping pages */
	MM_ANONPAGES,	/* Resident anonymous pages */
	MM_SWAPENTS,	/* Anonymous swap entries */
	MM_SHMEMPAGES,	/* Resident shared memory pages */
	NR_MM_COUNTERS
};

#if USE_SPLIT_PTE_PTLOCKS && defined(CONFIG_MMU)
#define SPLIT_RSS_COUNTING
/* per-thread cached information, */
struct task_rss_stat {
	int events;	/* for synchronization threshold */
	int count[NR_MM_COUNTERS];
};
#endif /* USE_SPLIT_PTE_PTLOCKS */

struct mm_rss_stat {
	atomic_long_t count[NR_MM_COUNTERS];
};

struct page_frag {
	struct page *page;
#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
	__u32 offset;
	__u32 size;
#else
	__u16 offset;
	__u16 size;
#endif
};

#endif /* _LINUX_MM_TYPES_TASK_H */
Commit	Line	Data
2e58f173 IM	1	#ifndef _LINUX_MM_TYPES_TASK_H
	2	#define _LINUX_MM_TYPES_TASK_H
	3
9e7d2e44 IM	4	/*
	5	* Here are the definitions of the MM data types that are embedded in 'struct task_struct'.
	6	*
	7	* (These are defined separately to decouple sched.h from mm_types.h as much as possible.)
	8	*/
	9
2e58f173 IM	10	#include <linux/types.h>
	11	#include <linux/threads.h>
	12	#include <linux/atomic.h>
	13
	14	#include <asm/page.h>
	15
9e7d2e44 IM	16	#define USE_SPLIT_PTE_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
	17	#define USE_SPLIT_PMD_PTLOCKS (USE_SPLIT_PTE_PTLOCKS && \
	18	IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK))
	19	#define ALLOC_SPLIT_PTLOCKS (SPINLOCK_SIZE > BITS_PER_LONG/8)
	20
	21	/*
	22	* The per task VMA cache array:
	23	*/
	24	#define VMACACHE_BITS 2
	25	#define VMACACHE_SIZE (1U << VMACACHE_BITS)
	26	#define VMACACHE_MASK (VMACACHE_SIZE - 1)
	27
	28	struct vmacache {
	29	u32 seqnum;
	30	struct vm_area_struct *vmas[VMACACHE_SIZE];
	31	};
	32
	33	enum {
	34	MM_FILEPAGES, /* Resident file mapping pages */
	35	MM_ANONPAGES, /* Resident anonymous pages */
	36	MM_SWAPENTS, /* Anonymous swap entries */
	37	MM_SHMEMPAGES, /* Resident shared memory pages */
	38	NR_MM_COUNTERS
	39	};
	40
	41	#if USE_SPLIT_PTE_PTLOCKS && defined(CONFIG_MMU)
	42	#define SPLIT_RSS_COUNTING
	43	/* per-thread cached information, */
	44	struct task_rss_stat {
	45	int events; /* for synchronization threshold */
	46	int count[NR_MM_COUNTERS];
	47	};
	48	#endif /* USE_SPLIT_PTE_PTLOCKS */
	49
	50	struct mm_rss_stat {
	51	atomic_long_t count[NR_MM_COUNTERS];
	52	};
	53
	54	struct page_frag {
	55	struct page *page;
	56	#if (BITS_PER_LONG > 32) \|\| (PAGE_SIZE >= 65536)
	57	__u32 offset;
	58	__u32 size;
	59	#else
	60	__u16 offset;
	61	__u16 size;
	62	#endif
	63	};
	64
2e58f173	65	#endif /* _LINUX_MM_TYPES_TASK_H */