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 34 struct vmacache { 35 u64 seqnum; 36 struct vm_area_struct *vmas[VMACACHE_SIZE]; 37 }; 38 39 enum { 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, */ 50 struct task_rss_stat { 51 int events; /* for synchronization threshold */ 52 int count[NR_MM_COUNTERS]; 53 }; 54 #endif /* USE_SPLIT_PTE_PTLOCKS */ 55 56 struct mm_rss_stat { 57 atomic_long_t count[NR_MM_COUNTERS]; 58 }; 59 60 struct 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 */ 72 struct 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