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 #define USE_SPLIT_PTE_PTLOCKS   (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
  18 #define USE_SPLIT_PMD_PTLOCKS   (USE_SPLIT_PTE_PTLOCKS && \
  19                 IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK))
  20 #define ALLOC_SPLIT_PTLOCKS     (SPINLOCK_SIZE > BITS_PER_LONG/8)
  21
  22 /*
  23  * The per task VMA cache array:
  24  */
  25 #define VMACACHE_BITS 2
  26 #define VMACACHE_SIZE (1U << VMACACHE_BITS)
  27 #define VMACACHE_MASK (VMACACHE_SIZE - 1)
  28
  29 struct vmacache {
  30         u32 seqnum;
  31         struct vm_area_struct *vmas[VMACACHE_SIZE];
  32 };
  33
  34 enum {
  35         MM_FILEPAGES,   /* Resident file mapping pages */
  36         MM_ANONPAGES,   /* Resident anonymous pages */
  37         MM_SWAPENTS,    /* Anonymous swap entries */
  38         MM_SHMEMPAGES,  /* Resident shared memory pages */
  39         NR_MM_COUNTERS
  40 };
  41
  42 #if USE_SPLIT_PTE_PTLOCKS && defined(CONFIG_MMU)
  43 #define SPLIT_RSS_COUNTING
  44 /* per-thread cached information, */
  45 struct task_rss_stat {
  46         int events;     /* for synchronization threshold */
  47         int count[NR_MM_COUNTERS];
  48 };
  49 #endif /* USE_SPLIT_PTE_PTLOCKS */
  50
  51 struct mm_rss_stat {
  52         atomic_long_t count[NR_MM_COUNTERS];
  53 };
  54
  55 struct page_frag {
  56         struct page *page;
  57 #if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
  58         __u32 offset;
  59         __u32 size;
  60 #else
  61         __u16 offset;
  62         __u16 size;
  63 #endif
  64 };
  65
  66 /* Track pages that require TLB flushes */
  67 struct tlbflush_unmap_batch {
  68 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
  69         /*
  70          * Each bit set is a CPU that potentially has a TLB entry for one of
  71          * the PFNs being flushed. See set_tlb_ubc_flush_pending().
  72          */
  73         struct cpumask cpumask;
  74
  75         /* True if any bit in cpumask is set */
  76         bool flush_required;
  77
  78         /*
  79          * If true then the PTE was dirty when unmapped. The entry must be
  80          * flushed before IO is initiated or a stale TLB entry potentially
  81          * allows an update without redirtying the page.
  82          */
  83         bool writable;
  84 #endif
  85 };
  86
  87 #endif /* _LINUX_MM_TYPES_TASK_H */