1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_MM_TYPES_TASK_H
3#define _LINUX_MM_TYPES_TASK_H
4
5/*
6 * Here are the definitions of the MM data types that are embedded in 'struct task_struct'.
7 *
8 * (These are defined separately to decouple sched.h from mm_types.h as much as possible.)
9 */
10
11#include <linux/types.h>
12#include <linux/threads.h>
13#include <linux/atomic.h>
14#include <linux/cpumask.h>
15
16#include <asm/page.h>
17
18#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
19#include <asm/tlbbatch.h>
20#endif
21
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)
26
27/*
28 * The per task VMA cache array:
29 */
30#define VMACACHE_BITS 2
31#define VMACACHE_SIZE (1U << VMACACHE_BITS)
32#define VMACACHE_MASK (VMACACHE_SIZE - 1)
33
34struct vmacache {
35 u32 seqnum;
36 struct vm_area_struct *vmas[VMACACHE_SIZE];
37};
38
39enum {
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 */
44 NR_MM_COUNTERS
45};
46
47#if USE_SPLIT_PTE_PTLOCKS && defined(CONFIG_MMU)
48#define SPLIT_RSS_COUNTING
49/* per-thread cached information, */
50struct task_rss_stat {
51 int events; /* for synchronization threshold */
52 int count[NR_MM_COUNTERS];
53};
54#endif /* USE_SPLIT_PTE_PTLOCKS */
55
56struct mm_rss_stat {
57 atomic_long_t count[NR_MM_COUNTERS];
58};
59
60struct page_frag {
61 struct page *page;
62#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
63 __u32 offset;
64 __u32 size;
65#else
66 __u16 offset;
67 __u16 size;
68#endif
69};
70
71/* Track pages that require TLB flushes */
72struct tlbflush_unmap_batch {
73#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
74 /*
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()
79 * returns.
80 */
81 struct arch_tlbflush_unmap_batch arch;
82
83 /* True if a flush is needed. */
84 bool flush_required;
85
86 /*
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.
90 */
91 bool writable;
92#endif
93};
94
95#endif /* _LINUX_MM_TYPES_TASK_H */
96