#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/mm.h>
-#include <linux/vmacache.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/swap.h>
activate_mm(active_mm, mm);
if (IS_ENABLED(CONFIG_ARCH_WANT_IRQS_OFF_ACTIVATE_MM))
local_irq_enable();
- tsk->mm->vmacache_seqnum = 0;
- vmacache_flush(tsk);
task_unlock(tsk);
lru_gen_use_mm(mm);
// SPDX-License-Identifier: GPL-2.0
#include <linux/pagewalk.h>
-#include <linux/vmacache.h>
#include <linux/mm_inline.h>
#include <linux/hugetlb.h>
#include <linux/huge_mm.h>
struct {
struct vm_area_struct *mmap; /* list of VMAs */
struct maple_tree mm_mt;
- u64 vmacache_seqnum; /* per-thread vmacache */
#ifdef CONFIG_MMU
unsigned long (*get_unmapped_area) (struct file *filp,
unsigned long addr, unsigned long len,
IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK))
#define ALLOC_SPLIT_PTLOCKS (SPINLOCK_SIZE > BITS_PER_LONG/8)
-/*
- * The per task VMA cache array:
- */
-#define VMACACHE_BITS 2
-#define VMACACHE_SIZE (1U << VMACACHE_BITS)
-#define VMACACHE_MASK (VMACACHE_SIZE - 1)
-
-struct vmacache {
- u64 seqnum;
- struct vm_area_struct *vmas[VMACACHE_SIZE];
-};
-
/*
* When updating this, please also update struct resident_page_types[] in
* kernel/fork.c
struct mm_struct *active_mm;
/* Per-thread vma caching: */
- struct vmacache vmacache;
#ifdef SPLIT_RSS_COUNTING
struct task_rss_stat rss_stat;
NR_TLB_LOCAL_FLUSH_ALL,
NR_TLB_LOCAL_FLUSH_ONE,
#endif /* CONFIG_DEBUG_TLBFLUSH */
-#ifdef CONFIG_DEBUG_VM_VMACACHE
- VMACACHE_FIND_CALLS,
- VMACACHE_FIND_HITS,
-#endif
#ifdef CONFIG_SWAP
SWAP_RA,
SWAP_RA_HIT,
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __LINUX_VMACACHE_H
-#define __LINUX_VMACACHE_H
-
-#include <linux/sched.h>
-#include <linux/mm.h>
-
-static inline void vmacache_flush(struct task_struct *tsk)
-{
- memset(tsk->vmacache.vmas, 0, sizeof(tsk->vmacache.vmas));
-}
-
-extern void vmacache_update(unsigned long addr, struct vm_area_struct *newvma);
-extern struct vm_area_struct *vmacache_find(struct mm_struct *mm,
- unsigned long addr);
-
-#ifndef CONFIG_MMU
-extern struct vm_area_struct *vmacache_find_exact(struct mm_struct *mm,
- unsigned long start,
- unsigned long end);
-#endif
-
-static inline void vmacache_invalidate(struct mm_struct *mm)
-{
- mm->vmacache_seqnum++;
-}
-
-#endif /* __LINUX_VMACACHE_H */
#define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
#endif
-#ifdef CONFIG_DEBUG_VM_VMACACHE
-#define count_vm_vmacache_event(x) count_vm_event(x)
-#else
-#define count_vm_vmacache_event(x) do {} while (0)
-#endif
-
#define __count_zid_vm_events(item, zid, delta) \
__count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta)
#include <linux/pid.h>
#include <linux/smp.h>
#include <linux/mm.h>
-#include <linux/vmacache.h>
#include <linux/rcupdate.h>
#include <linux/irq.h>
#include <linux/security.h>
if (!CACHE_FLUSH_IS_SAFE)
return;
- if (current->mm) {
- int i;
-
- for (i = 0; i < VMACACHE_SIZE; i++) {
- if (!current->vmacache.vmas[i])
- continue;
- flush_cache_range(current->vmacache.vmas[i],
- addr, addr + BREAK_INSTR_SIZE);
- }
- }
-
/* Force flush instruction cache if it was outside the mm */
flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
}
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mm_inline.h>
-#include <linux/vmacache.h>
#include <linux/nsproxy.h>
#include <linux/capability.h>
#include <linux/cpu.h>
mm->mmap = NULL;
mt_init_flags(&mm->mm_mt, MM_MT_FLAGS);
mt_set_external_lock(&mm->mm_mt, &mm->mmap_lock);
- mm->vmacache_seqnum = 0;
atomic_set(&mm->mm_users, 1);
atomic_set(&mm->mm_count, 1);
seqcount_init(&mm->write_protect_seq);
if (!oldmm)
return 0;
- /* initialize the new vmacache entries */
- vmacache_flush(tsk);
-
if (clone_flags & CLONE_VM) {
mmget(oldmm);
mm = oldmm;
If unsure, say N.
-config DEBUG_VM_VMACACHE
- bool "Debug VMA caching"
- depends on DEBUG_VM
- help
- Enable this to turn on VMA caching debug information. Doing so
- can cause significant overhead, so only enable it in non-production
- environments.
-
config DEBUG_VM_MAPLE_TREE
bool "Debug VM maple trees"
depends on DEBUG_VM
readahead.o swap.o truncate.o vmscan.o shmem.o \
util.o mmzone.o vmstat.o backing-dev.o \
mm_init.o percpu.o slab_common.o \
- compaction.o vmacache.o \
+ compaction.o \
interval_tree.o list_lru.o workingset.o \
debug.o gup.o mmap_lock.o $(mmu-y)
void dump_mm(const struct mm_struct *mm)
{
- pr_emerg("mm %px mmap %px seqnum %llu task_size %lu\n"
+ pr_emerg("mm %px mmap %px task_size %lu\n"
#ifdef CONFIG_MMU
"get_unmapped_area %px\n"
#endif
"tlb_flush_pending %d\n"
"def_flags: %#lx(%pGv)\n",
- mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size,
+ mm, mm->mmap, mm->task_size,
#ifdef CONFIG_MMU
mm->get_unmapped_area,
#endif
#include <linux/backing-dev.h>
#include <linux/mm.h>
#include <linux/mm_inline.h>
-#include <linux/vmacache.h>
#include <linux/shm.h>
#include <linux/mman.h>
#include <linux/pagemap.h>
/* Remove from mm linked list - also updates highest_vm_end */
__vma_unlink_list(mm, next);
- /* Kill the cache */
- vmacache_invalidate(mm);
-
if (file)
__remove_shared_vm_struct(next, file, mapping);
__vma_unlink_list(mm, next);
if (remove_next == 2)
__vma_unlink_list(mm, next_next);
- /* Kill the cache */
- vmacache_invalidate(mm);
if (file) {
__remove_shared_vm_struct(next, file, mapping);
unsigned long start_addr,
unsigned long end_addr)
{
- struct vm_area_struct *vma;
unsigned long index = start_addr;
mmap_assert_locked(mm);
- /* Check the cache first. */
- vma = vmacache_find(mm, start_addr);
- if (likely(vma))
- return vma;
-
- vma = mt_find(&mm->mm_mt, &index, end_addr - 1);
- if (vma)
- vmacache_update(start_addr, vma);
- return vma;
+ return mt_find(&mm->mm_mt, &index, end_addr - 1);
}
EXPORT_SYMBOL(find_vma_intersection);
*/
struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
{
- struct vm_area_struct *vma;
unsigned long index = addr;
mmap_assert_locked(mm);
- /* Check the cache first. */
- vma = vmacache_find(mm, addr);
- if (likely(vma))
- return vma;
-
- vma = mt_find(&mm->mm_mt, &index, ULONG_MAX);
- if (vma)
- vmacache_update(addr, vma);
- return vma;
+ return mt_find(&mm->mm_mt, &index, ULONG_MAX);
}
EXPORT_SYMBOL(find_vma);
mm->highest_vm_end = prev ? vm_end_gap(prev) : 0;
tail_vma->vm_next = NULL;
- /* Kill the cache */
- vmacache_invalidate(mm);
-
/*
* Do not downgrade mmap_lock if we are next to VM_GROWSDOWN or
* VM_GROWSUP VMA. Such VMAs can change their size under
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/sched/mm.h>
-#include <linux/vmacache.h>
#include <linux/mman.h>
#include <linux/swap.h>
#include <linux/file.h>
*/
static void delete_vma_from_mm(struct vm_area_struct *vma)
{
- int i;
- struct address_space *mapping;
- struct mm_struct *mm = vma->vm_mm;
- struct task_struct *curr = current;
MA_STATE(mas, &vma->vm_mm->mm_mt, 0, 0);
- mm->map_count--;
- for (i = 0; i < VMACACHE_SIZE; i++) {
- /* if the vma is cached, invalidate the entire cache */
- if (curr->vmacache.vmas[i] == vma) {
- vmacache_invalidate(mm);
- break;
- }
- }
-
+ vma->vm_mm->map_count--;
/* remove the VMA from the mapping */
if (vma->vm_file) {
+ struct address_space *mapping;
mapping = vma->vm_file->f_mapping;
i_mmap_lock_write(mapping);
/* remove from the MM's tree and list */
vma_mas_remove(vma, &mas);
- __vma_unlink_list(mm, vma);
+ __vma_unlink_list(vma->vm_mm, vma);
}
/*
*/
struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
{
- struct vm_area_struct *vma;
MA_STATE(mas, &mm->mm_mt, addr, addr);
- /* check the cache first */
- vma = vmacache_find(mm, addr);
- if (likely(vma))
- return vma;
-
- vma = mas_walk(&mas);
-
- if (vma)
- vmacache_update(addr, vma);
-
- return vma;
+ return mas_walk(&mas);
}
EXPORT_SYMBOL(find_vma);
unsigned long end = addr + len;
MA_STATE(mas, &mm->mm_mt, addr, addr);
- /* check the cache first */
- vma = vmacache_find_exact(mm, addr, end);
- if (vma)
- return vma;
-
vma = mas_walk(&mas);
if (!vma)
return NULL;
if (vma->vm_end != end)
return NULL;
- vmacache_update(addr, vma);
return vma;
}
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2014 Davidlohr Bueso.
- */
-#include <linux/sched/signal.h>
-#include <linux/sched/task.h>
-#include <linux/mm.h>
-#include <linux/vmacache.h>
-
-/*
- * Hash based on the pmd of addr if configured with MMU, which provides a good
- * hit rate for workloads with spatial locality. Otherwise, use pages.
- */
-#ifdef CONFIG_MMU
-#define VMACACHE_SHIFT PMD_SHIFT
-#else
-#define VMACACHE_SHIFT PAGE_SHIFT
-#endif
-#define VMACACHE_HASH(addr) ((addr >> VMACACHE_SHIFT) & VMACACHE_MASK)
-
-/*
- * This task may be accessing a foreign mm via (for example)
- * get_user_pages()->find_vma(). The vmacache is task-local and this
- * task's vmacache pertains to a different mm (ie, its own). There is
- * nothing we can do here.
- *
- * Also handle the case where a kernel thread has adopted this mm via
- * kthread_use_mm(). That kernel thread's vmacache is not applicable to this mm.
- */
-static inline bool vmacache_valid_mm(struct mm_struct *mm)
-{
- return current->mm == mm && !(current->flags & PF_KTHREAD);
-}
-
-void vmacache_update(unsigned long addr, struct vm_area_struct *newvma)
-{
- if (vmacache_valid_mm(newvma->vm_mm))
- current->vmacache.vmas[VMACACHE_HASH(addr)] = newvma;
-}
-
-static bool vmacache_valid(struct mm_struct *mm)
-{
- struct task_struct *curr;
-
- if (!vmacache_valid_mm(mm))
- return false;
-
- curr = current;
- if (mm->vmacache_seqnum != curr->vmacache.seqnum) {
- /*
- * First attempt will always be invalid, initialize
- * the new cache for this task here.
- */
- curr->vmacache.seqnum = mm->vmacache_seqnum;
- vmacache_flush(curr);
- return false;
- }
- return true;
-}
-
-struct vm_area_struct *vmacache_find(struct mm_struct *mm, unsigned long addr)
-{
- int idx = VMACACHE_HASH(addr);
- int i;
-
- count_vm_vmacache_event(VMACACHE_FIND_CALLS);
-
- if (!vmacache_valid(mm))
- return NULL;
-
- for (i = 0; i < VMACACHE_SIZE; i++) {
- struct vm_area_struct *vma = current->vmacache.vmas[idx];
-
- if (vma) {
-#ifdef CONFIG_DEBUG_VM_VMACACHE
- if (WARN_ON_ONCE(vma->vm_mm != mm))
- break;
-#endif
- if (vma->vm_start <= addr && vma->vm_end > addr) {
- count_vm_vmacache_event(VMACACHE_FIND_HITS);
- return vma;
- }
- }
- if (++idx == VMACACHE_SIZE)
- idx = 0;
- }
-
- return NULL;
-}
-
-#ifndef CONFIG_MMU
-struct vm_area_struct *vmacache_find_exact(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
-{
- int idx = VMACACHE_HASH(start);
- int i;
-
- count_vm_vmacache_event(VMACACHE_FIND_CALLS);
-
- if (!vmacache_valid(mm))
- return NULL;
-
- for (i = 0; i < VMACACHE_SIZE; i++) {
- struct vm_area_struct *vma = current->vmacache.vmas[idx];
-
- if (vma && vma->vm_start == start && vma->vm_end == end) {
- count_vm_vmacache_event(VMACACHE_FIND_HITS);
- return vma;
- }
- if (++idx == VMACACHE_SIZE)
- idx = 0;
- }
-
- return NULL;
-}
-#endif
"nr_tlb_local_flush_one",
#endif /* CONFIG_DEBUG_TLBFLUSH */
-#ifdef CONFIG_DEBUG_VM_VMACACHE
- "vmacache_find_calls",
- "vmacache_find_hits",
-#endif
#ifdef CONFIG_SWAP
"swap_ra",
"swap_ra_hit",
projects / kernel.git / commitdiff