1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_MM_TYPES_TASK_H
3 #define _LINUX_MM_TYPES_TASK_H
6 * Here are the definitions of the MM data types that are embedded in 'struct task_struct'.
8 * (These are defined separately to decouple sched.h from mm_types.h as much as possible.)
11 #include <linux/types.h>
12 #include <linux/threads.h>
13 #include <linux/atomic.h>
14 #include <linux/cpumask.h>
18 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
19 #include <asm/tlbbatch.h>
22 #define USE_SPLIT_PTE_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
23 #define USE_SPLIT_PMD_PTLOCKS (USE_SPLIT_PTE_PTLOCKS && \
24 IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK))
25 #define ALLOC_SPLIT_PTLOCKS (SPINLOCK_SIZE > BITS_PER_LONG/8)
28 * The per task VMA cache array:
30 #define VMACACHE_BITS 2
31 #define VMACACHE_SIZE (1U << VMACACHE_BITS)
32 #define VMACACHE_MASK (VMACACHE_SIZE - 1)
36 struct vm_area_struct
*vmas
[VMACACHE_SIZE
];
40 MM_FILEPAGES
, /* Resident file mapping pages */
41 MM_ANONPAGES
, /* Resident anonymous pages */
42 MM_SWAPENTS
, /* Anonymous swap entries */
43 MM_SHMEMPAGES
, /* Resident shared memory pages */
47 #if USE_SPLIT_PTE_PTLOCKS && defined(CONFIG_MMU)
48 #define SPLIT_RSS_COUNTING
49 /* per-thread cached information, */
50 struct task_rss_stat
{
51 int events
; /* for synchronization threshold */
52 int count
[NR_MM_COUNTERS
];
54 #endif /* USE_SPLIT_PTE_PTLOCKS */
57 atomic_long_t count
[NR_MM_COUNTERS
];
62 #if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
71 /* Track pages that require TLB flushes */
72 struct tlbflush_unmap_batch
{
73 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
75 * The arch code makes the following promise: generic code can modify a
76 * PTE, then call arch_tlbbatch_add_mm() (which internally provides all
77 * needed barriers), then call arch_tlbbatch_flush(), and the entries
78 * will be flushed on all CPUs by the time that arch_tlbbatch_flush()
81 struct arch_tlbflush_unmap_batch arch
;
83 /* True if a flush is needed. */
87 * If true then the PTE was dirty when unmapped. The entry must be
88 * flushed before IO is initiated or a stale TLB entry potentially
89 * allows an update without redirtying the page.
95 #endif /* _LINUX_MM_TYPES_TASK_H */