include/linux/mm_types_task.h

   1 #ifndef _LINUX_MM_TYPES_TASK_H
   2 #define _LINUX_MM_TYPES_TASK_H
   3
   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
  10 #include <linux/types.h>
  11 #include <linux/threads.h>
  12 #include <linux/atomic.h>
  13 #include <linux/cpumask.h>
  14
  15 #include <asm/page.h>
  16
  17 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
  18 #include <asm/tlbbatch.h>
  19 #endif
  20
  21 #define USE_SPLIT_PTE_PTLOCKS   (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
  22 #define USE_SPLIT_PMD_PTLOCKS   (USE_SPLIT_PTE_PTLOCKS && \
  23                 IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK))
  24 #define ALLOC_SPLIT_PTLOCKS     (SPINLOCK_SIZE > BITS_PER_LONG/8)
  25
  26 /*
  27  * The per task VMA cache array:
  28  */
  29 #define VMACACHE_BITS 2
  30 #define VMACACHE_SIZE (1U << VMACACHE_BITS)
  31 #define VMACACHE_MASK (VMACACHE_SIZE - 1)
  32
  33 struct vmacache {
  34         u32 seqnum;
  35         struct vm_area_struct *vmas[VMACACHE_SIZE];
  36 };
  37
  38 enum {
  39         MM_FILEPAGES,   /* Resident file mapping pages */
  40         MM_ANONPAGES,   /* Resident anonymous pages */
  41         MM_SWAPENTS,    /* Anonymous swap entries */
  42         MM_SHMEMPAGES,  /* Resident shared memory pages */
  43         NR_MM_COUNTERS
  44 };
  45
  46 #if USE_SPLIT_PTE_PTLOCKS && defined(CONFIG_MMU)
  47 #define SPLIT_RSS_COUNTING
  48 /* per-thread cached information, */
  49 struct task_rss_stat {
  50         int events;     /* for synchronization threshold */
  51         int count[NR_MM_COUNTERS];
  52 };
  53 #endif /* USE_SPLIT_PTE_PTLOCKS */
  54
  55 struct mm_rss_stat {
  56         atomic_long_t count[NR_MM_COUNTERS];
  57 };
  58
  59 struct page_frag {
  60         struct page *page;
  61 #if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
  62         __u32 offset;
  63         __u32 size;
  64 #else
  65         __u16 offset;
  66         __u16 size;
  67 #endif
  68 };
  69
  70 /* Track pages that require TLB flushes */
  71 struct tlbflush_unmap_batch {
  72 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
  73         /*
  74          * The arch code makes the following promise: generic code can modify a
  75          * PTE, then call arch_tlbbatch_add_mm() (which internally provides all
  76          * needed barriers), then call arch_tlbbatch_flush(), and the entries
  77          * will be flushed on all CPUs by the time that arch_tlbbatch_flush()
  78          * returns.
  79          */
  80         struct arch_tlbflush_unmap_batch arch;
  81
  82         /* True if a flush is needed. */
  83         bool flush_required;
  84
  85         /*
  86          * If true then the PTE was dirty when unmapped. The entry must be
  87          * flushed before IO is initiated or a stale TLB entry potentially
  88          * allows an update without redirtying the page.
  89          */
  90         bool writable;
  91 #endif
  92 };
  93
  94 #endif /* _LINUX_MM_TYPES_TASK_H */