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-rw-r--r--mm/Makefile2
-rw-r--r--mm/debug.c1
-rw-r--r--mm/filemap.c1
-rw-r--r--mm/filemap_xip.c1
-rw-r--r--mm/fremap.c283
-rw-r--r--mm/gup.c2
-rw-r--r--mm/hugetlb.c2
-rw-r--r--mm/interval_tree.c34
-rw-r--r--mm/ksm.c2
-rw-r--r--mm/madvise.c13
-rw-r--r--mm/memcontrol.c187
-rw-r--r--mm/memory.c276
-rw-r--r--mm/migrate.c32
-rw-r--r--mm/mincore.c9
-rw-r--r--mm/mmap.c93
-rw-r--r--mm/mprotect.c2
-rw-r--r--mm/mremap.c2
-rw-r--r--mm/msync.c5
-rw-r--r--mm/nommu.c8
-rw-r--r--mm/page_alloc.c8
-rw-r--r--mm/rmap.c225
-rw-r--r--mm/shmem.c1
-rw-r--r--mm/slab.h4
-rw-r--r--mm/slab_common.c151
-rw-r--r--mm/slub.c37
-rw-r--r--mm/swap.c4
-rw-r--r--mm/vmstat.c124
27 files changed, 411 insertions, 1098 deletions
diff --git a/mm/Makefile b/mm/Makefile
index 4bf586e66378..3548460ab7b6 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -3,7 +3,7 @@
#
mmu-y := nommu.o
-mmu-$(CONFIG_MMU) := fremap.o gup.o highmem.o memory.o mincore.o \
+mmu-$(CONFIG_MMU) := gup.o highmem.o memory.o mincore.o \
mlock.o mmap.o mprotect.o mremap.o msync.o rmap.o \
vmalloc.o pagewalk.o pgtable-generic.o
diff --git a/mm/debug.c b/mm/debug.c
index 0e58f3211f89..d69cb5a7ba9a 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -130,7 +130,6 @@ static const struct trace_print_flags vmaflags_names[] = {
{VM_ACCOUNT, "account" },
{VM_NORESERVE, "noreserve" },
{VM_HUGETLB, "hugetlb" },
- {VM_NONLINEAR, "nonlinear" },
#if defined(CONFIG_X86)
{VM_PAT, "pat" },
#elif defined(CONFIG_PPC)
diff --git a/mm/filemap.c b/mm/filemap.c
index 673e4581a2e5..bf7a27142704 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2087,7 +2087,6 @@ const struct vm_operations_struct generic_file_vm_ops = {
.fault = filemap_fault,
.map_pages = filemap_map_pages,
.page_mkwrite = filemap_page_mkwrite,
- .remap_pages = generic_file_remap_pages,
};
/* This is used for a general mmap of a disk file */
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index 0d105aeff82f..70c09da1a419 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -301,7 +301,6 @@ out:
static const struct vm_operations_struct xip_file_vm_ops = {
.fault = xip_file_fault,
.page_mkwrite = filemap_page_mkwrite,
- .remap_pages = generic_file_remap_pages,
};
int xip_file_mmap(struct file * file, struct vm_area_struct * vma)
diff --git a/mm/fremap.c b/mm/fremap.c
deleted file mode 100644
index 2805d71cf476..000000000000
--- a/mm/fremap.c
+++ /dev/null
@@ -1,283 +0,0 @@
-/*
- * linux/mm/fremap.c
- *
- * Explicit pagetable population and nonlinear (random) mappings support.
- *
- * started by Ingo Molnar, Copyright (C) 2002, 2003
- */
-#include <linux/export.h>
-#include <linux/backing-dev.h>
-#include <linux/mm.h>
-#include <linux/swap.h>
-#include <linux/file.h>
-#include <linux/mman.h>
-#include <linux/pagemap.h>
-#include <linux/swapops.h>
-#include <linux/rmap.h>
-#include <linux/syscalls.h>
-#include <linux/mmu_notifier.h>
-
-#include <asm/mmu_context.h>
-#include <asm/cacheflush.h>
-#include <asm/tlbflush.h>
-
-#include "internal.h"
-
-static int mm_counter(struct page *page)
-{
- return PageAnon(page) ? MM_ANONPAGES : MM_FILEPAGES;
-}
-
-static void zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep)
-{
- pte_t pte = *ptep;
- struct page *page;
- swp_entry_t entry;
-
- if (pte_present(pte)) {
- flush_cache_page(vma, addr, pte_pfn(pte));
- pte = ptep_clear_flush_notify(vma, addr, ptep);
- page = vm_normal_page(vma, addr, pte);
- if (page) {
- if (pte_dirty(pte))
- set_page_dirty(page);
- update_hiwater_rss(mm);
- dec_mm_counter(mm, mm_counter(page));
- page_remove_rmap(page);
- page_cache_release(page);
- }
- } else { /* zap_pte() is not called when pte_none() */
- if (!pte_file(pte)) {
- update_hiwater_rss(mm);
- entry = pte_to_swp_entry(pte);
- if (non_swap_entry(entry)) {
- if (is_migration_entry(entry)) {
- page = migration_entry_to_page(entry);
- dec_mm_counter(mm, mm_counter(page));
- }
- } else {
- free_swap_and_cache(entry);
- dec_mm_counter(mm, MM_SWAPENTS);
- }
- }
- pte_clear_not_present_full(mm, addr, ptep, 0);
- }
-}
-
-/*
- * Install a file pte to a given virtual memory address, release any
- * previously existing mapping.
- */
-static int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long addr, unsigned long pgoff, pgprot_t prot)
-{
- int err = -ENOMEM;
- pte_t *pte, ptfile;
- spinlock_t *ptl;
-
- pte = get_locked_pte(mm, addr, &ptl);
- if (!pte)
- goto out;
-
- ptfile = pgoff_to_pte(pgoff);
-
- if (!pte_none(*pte))
- zap_pte(mm, vma, addr, pte);
-
- set_pte_at(mm, addr, pte, pte_file_mksoft_dirty(ptfile));
- /*
- * We don't need to run update_mmu_cache() here because the "file pte"
- * being installed by install_file_pte() is not a real pte - it's a
- * non-present entry (like a swap entry), noting what file offset should
- * be mapped there when there's a fault (in a non-linear vma where
- * that's not obvious).
- */
- pte_unmap_unlock(pte, ptl);
- err = 0;
-out:
- return err;
-}
-
-int generic_file_remap_pages(struct vm_area_struct *vma, unsigned long addr,
- unsigned long size, pgoff_t pgoff)
-{
- struct mm_struct *mm = vma->vm_mm;
- int err;
-
- do {
- err = install_file_pte(mm, vma, addr, pgoff, vma->vm_page_prot);
- if (err)
- return err;
-
- size -= PAGE_SIZE;
- addr += PAGE_SIZE;
- pgoff++;
- } while (size);
-
- return 0;
-}
-EXPORT_SYMBOL(generic_file_remap_pages);
-
-/**
- * sys_remap_file_pages - remap arbitrary pages of an existing VM_SHARED vma
- * @start: start of the remapped virtual memory range
- * @size: size of the remapped virtual memory range
- * @prot: new protection bits of the range (see NOTE)
- * @pgoff: to-be-mapped page of the backing store file
- * @flags: 0 or MAP_NONBLOCKED - the later will cause no IO.
- *
- * sys_remap_file_pages remaps arbitrary pages of an existing VM_SHARED vma
- * (shared backing store file).
- *
- * This syscall works purely via pagetables, so it's the most efficient
- * way to map the same (large) file into a given virtual window. Unlike
- * mmap()/mremap() it does not create any new vmas. The new mappings are
- * also safe across swapout.
- *
- * NOTE: the @prot parameter right now is ignored (but must be zero),
- * and the vma's default protection is used. Arbitrary protections
- * might be implemented in the future.
- */
-SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
- unsigned long, prot, unsigned long, pgoff, unsigned long, flags)
-{
- struct mm_struct *mm = current->mm;
- struct address_space *mapping;
- struct vm_area_struct *vma;
- int err = -EINVAL;
- int has_write_lock = 0;
- vm_flags_t vm_flags = 0;
-
- pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. "
- "See Documentation/vm/remap_file_pages.txt.\n",
- current->comm, current->pid);
-
- if (prot)
- return err;
- /*
- * Sanitize the syscall parameters:
- */
- start = start & PAGE_MASK;
- size = size & PAGE_MASK;
-
- /* Does the address range wrap, or is the span zero-sized? */
- if (start + size <= start)
- return err;
-
- /* Does pgoff wrap? */
- if (pgoff + (size >> PAGE_SHIFT) < pgoff)
- return err;
-
- /* Can we represent this offset inside this architecture's pte's? */
-#if PTE_FILE_MAX_BITS < BITS_PER_LONG
- if (pgoff + (size >> PAGE_SHIFT) >= (1UL << PTE_FILE_MAX_BITS))
- return err;
-#endif
-
- /* We need down_write() to change vma->vm_flags. */
- down_read(&mm->mmap_sem);
- retry:
- vma = find_vma(mm, start);
-
- /*
- * Make sure the vma is shared, that it supports prefaulting,
- * and that the remapped range is valid and fully within
- * the single existing vma.
- */
- if (!vma || !(vma->vm_flags & VM_SHARED))
- goto out;
-
- if (!vma->vm_ops || !vma->vm_ops->remap_pages)
- goto out;
-
- if (start < vma->vm_start || start + size > vma->vm_end)
- goto out;
-
- /* Must set VM_NONLINEAR before any pages are populated. */
- if (!(vma->vm_flags & VM_NONLINEAR)) {
- /*
- * vm_private_data is used as a swapout cursor
- * in a VM_NONLINEAR vma.
- */
- if (vma->vm_private_data)
- goto out;
-
- /* Don't need a nonlinear mapping, exit success */
- if (pgoff == linear_page_index(vma, start)) {
- err = 0;
- goto out;
- }
-
- if (!has_write_lock) {
-get_write_lock:
- up_read(&mm->mmap_sem);
- down_write(&mm->mmap_sem);
- has_write_lock = 1;
- goto retry;
- }
- mapping = vma->vm_file->f_mapping;
- /*
- * page_mkclean doesn't work on nonlinear vmas, so if
- * dirty pages need to be accounted, emulate with linear
- * vmas.
- */
- if (mapping_cap_account_dirty(mapping)) {
- unsigned long addr;
- struct file *file = get_file(vma->vm_file);
- /* mmap_region may free vma; grab the info now */
- vm_flags = vma->vm_flags;
-
- addr = mmap_region(file, start, size, vm_flags, pgoff);
- fput(file);
- if (IS_ERR_VALUE(addr)) {
- err = addr;
- } else {
- BUG_ON(addr != start);
- err = 0;
- }
- goto out_freed;
- }
- i_mmap_lock_write(mapping);
- flush_dcache_mmap_lock(mapping);
- vma->vm_flags |= VM_NONLINEAR;
- vma_interval_tree_remove(vma, &mapping->i_mmap);
- vma_nonlinear_insert(vma, &mapping->i_mmap_nonlinear);
- flush_dcache_mmap_unlock(mapping);
- i_mmap_unlock_write(mapping);
- }
-
- if (vma->vm_flags & VM_LOCKED) {
- /*
- * drop PG_Mlocked flag for over-mapped range
- */
- if (!has_write_lock)
- goto get_write_lock;
- vm_flags = vma->vm_flags;
- munlock_vma_pages_range(vma, start, start + size);
- vma->vm_flags = vm_flags;
- }
-
- mmu_notifier_invalidate_range_start(mm, start, start + size);
- err = vma->vm_ops->remap_pages(vma, start, size, pgoff);
- mmu_notifier_invalidate_range_end(mm, start, start + size);
-
- /*
- * We can't clear VM_NONLINEAR because we'd have to do
- * it after ->populate completes, and that would prevent
- * downgrading the lock. (Locks can't be upgraded).
- */
-
-out:
- if (vma)
- vm_flags = vma->vm_flags;
-out_freed:
- if (likely(!has_write_lock))
- up_read(&mm->mmap_sem);
- else
- up_write(&mm->mmap_sem);
- if (!err && ((vm_flags & VM_LOCKED) || !(flags & MAP_NONBLOCK)))
- mm_populate(start, size);
-
- return err;
-}
diff --git a/mm/gup.c b/mm/gup.c
index 8dd50ce6326f..12bc2bc33da7 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -55,7 +55,7 @@ retry:
*/
if (likely(!(flags & FOLL_MIGRATION)))
goto no_page;
- if (pte_none(pte) || pte_file(pte))
+ if (pte_none(pte))
goto no_page;
entry = pte_to_swp_entry(pte);
if (!is_migration_entry(entry))
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 85032de5e20f..be0e5d0db5ec 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -35,7 +35,7 @@
#include <linux/node.h>
#include "internal.h"
-unsigned long hugepages_treat_as_movable;
+int hugepages_treat_as_movable;
int hugetlb_max_hstate __read_mostly;
unsigned int default_hstate_idx;
diff --git a/mm/interval_tree.c b/mm/interval_tree.c
index 8da581fa9060..f2c2492681bf 100644
--- a/mm/interval_tree.c
+++ b/mm/interval_tree.c
@@ -21,8 +21,8 @@ static inline unsigned long vma_last_pgoff(struct vm_area_struct *v)
return v->vm_pgoff + ((v->vm_end - v->vm_start) >> PAGE_SHIFT) - 1;
}
-INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.linear.rb,
- unsigned long, shared.linear.rb_subtree_last,
+INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.rb,
+ unsigned long, shared.rb_subtree_last,
vma_start_pgoff, vma_last_pgoff,, vma_interval_tree)
/* Insert node immediately after prev in the interval tree */
@@ -36,26 +36,26 @@ void vma_interval_tree_insert_after(struct vm_area_struct *node,
VM_BUG_ON_VMA(vma_start_pgoff(node) != vma_start_pgoff(prev), node);
- if (!prev->shared.linear.rb.rb_right) {
+ if (!prev->shared.rb.rb_right) {
parent = prev;
- link = &prev->shared.linear.rb.rb_right;
+ link = &prev->shared.rb.rb_right;
} else {
- parent = rb_entry(prev->shared.linear.rb.rb_right,
- struct vm_area_struct, shared.linear.rb);
- if (parent->shared.linear.rb_subtree_last < last)
- parent->shared.linear.rb_subtree_last = last;
- while (parent->shared.linear.rb.rb_left) {
- parent = rb_entry(parent->shared.linear.rb.rb_left,
- struct vm_area_struct, shared.linear.rb);
- if (parent->shared.linear.rb_subtree_last < last)
- parent->shared.linear.rb_subtree_last = last;
+ parent = rb_entry(prev->shared.rb.rb_right,
+ struct vm_area_struct, shared.rb);
+ if (parent->shared.rb_subtree_last < last)
+ parent->shared.rb_subtree_last = last;
+ while (parent->shared.rb.rb_left) {
+ parent = rb_entry(parent->shared.rb.rb_left,
+ struct vm_area_struct, shared.rb);
+ if (parent->shared.rb_subtree_last < last)
+ parent->shared.rb_subtree_last = last;
}
- link = &parent->shared.linear.rb.rb_left;
+ link = &parent->shared.rb.rb_left;
}
- node->shared.linear.rb_subtree_last = last;
- rb_link_node(&node->shared.linear.rb, &parent->shared.linear.rb, link);
- rb_insert_augmented(&node->shared.linear.rb, root,
+ node->shared.rb_subtree_last = last;
+ rb_link_node(&node->shared.rb, &parent->shared.rb, link);
+ rb_insert_augmented(&node->shared.rb, root,
&vma_interval_tree_augment);
}
diff --git a/mm/ksm.c b/mm/ksm.c
index 15647fb0394f..4162dce2eb44 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1748,7 +1748,7 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
*/
if (*vm_flags & (VM_MERGEABLE | VM_SHARED | VM_MAYSHARE |
VM_PFNMAP | VM_IO | VM_DONTEXPAND |
- VM_HUGETLB | VM_NONLINEAR | VM_MIXEDMAP))
+ VM_HUGETLB | VM_MIXEDMAP))
return 0; /* just ignore the advice */
#ifdef VM_SAO
diff --git a/mm/madvise.c b/mm/madvise.c
index a271adc93289..d79fb5e8f80a 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -155,7 +155,7 @@ static int swapin_walk_pmd_entry(pmd_t *pmd, unsigned long start,
pte = *(orig_pte + ((index - start) / PAGE_SIZE));
pte_unmap_unlock(orig_pte, ptl);
- if (pte_present(pte) || pte_none(pte) || pte_file(pte))
+ if (pte_present(pte) || pte_none(pte))
continue;
entry = pte_to_swp_entry(pte);
if (unlikely(non_swap_entry(entry)))
@@ -278,14 +278,7 @@ static long madvise_dontneed(struct vm_area_struct *vma,
if (vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP))
return -EINVAL;
- if (unlikely(vma->vm_flags & VM_NONLINEAR)) {
- struct zap_details details = {
- .nonlinear_vma = vma,
- .last_index = ULONG_MAX,
- };
- zap_page_range(vma, start, end - start, &details);
- } else
- zap_page_range(vma, start, end - start, NULL);
+ zap_page_range(vma, start, end - start, NULL);
return 0;
}
@@ -303,7 +296,7 @@ static long madvise_remove(struct vm_area_struct *vma,
*prev = NULL; /* tell sys_madvise we drop mmap_sem */
- if (vma->vm_flags & (VM_LOCKED|VM_NONLINEAR|VM_HUGETLB))
+ if (vma->vm_flags & (VM_LOCKED | VM_HUGETLB))
return -EINVAL;
f = vma->vm_file;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2f6893c2f01b..f3f8a4f52a0c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -343,9 +343,6 @@ struct mem_cgroup {
struct cg_proto tcp_mem;
#endif
#if defined(CONFIG_MEMCG_KMEM)
- /* analogous to slab_common's slab_caches list, but per-memcg;
- * protected by memcg_slab_mutex */
- struct list_head memcg_slab_caches;
/* Index in the kmem_cache->memcg_params->memcg_caches array */
int kmemcg_id;
#endif
@@ -2476,27 +2473,8 @@ static void commit_charge(struct page *page, struct mem_cgroup *memcg,
}
#ifdef CONFIG_MEMCG_KMEM
-/*
- * The memcg_slab_mutex is held whenever a per memcg kmem cache is created or
- * destroyed. It protects memcg_caches arrays and memcg_slab_caches lists.
- */
-static DEFINE_MUTEX(memcg_slab_mutex);
-
-/*
- * This is a bit cumbersome, but it is rarely used and avoids a backpointer
- * in the memcg_cache_params struct.
- */
-static struct kmem_cache *memcg_params_to_cache(struct memcg_cache_params *p)
-{
- struct kmem_cache *cachep;
-
- VM_BUG_ON(p->is_root_cache);
- cachep = p->root_cache;
- return cache_from_memcg_idx(cachep, memcg_cache_id(p->memcg));
-}
-
-static int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp,
- unsigned long nr_pages)
+int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp,
+ unsigned long nr_pages)
{
struct page_counter *counter;
int ret = 0;
@@ -2533,8 +2511,7 @@ static int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp,
return ret;
}
-static void memcg_uncharge_kmem(struct mem_cgroup *memcg,
- unsigned long nr_pages)
+void memcg_uncharge_kmem(struct mem_cgroup *memcg, unsigned long nr_pages)
{
page_counter_uncharge(&memcg->memory, nr_pages);
if (do_swap_account)
@@ -2579,10 +2556,7 @@ static int memcg_alloc_cache_id(void)
else if (size > MEMCG_CACHES_MAX_SIZE)
size = MEMCG_CACHES_MAX_SIZE;
- mutex_lock(&memcg_slab_mutex);
err = memcg_update_all_caches(size);
- mutex_unlock(&memcg_slab_mutex);
-
if (err) {
ida_simple_remove(&kmem_limited_groups, id);
return err;
@@ -2605,123 +2579,20 @@ void memcg_update_array_size(int num)
memcg_limited_groups_array_size = num;
}
-static void memcg_register_cache(struct mem_cgroup *memcg,
- struct kmem_cache *root_cache)
-{
- static char memcg_name_buf[NAME_MAX + 1]; /* protected by
- memcg_slab_mutex */
- struct kmem_cache *cachep;
- int id;
-
- lockdep_assert_held(&memcg_slab_mutex);
-
- id = memcg_cache_id(memcg);
-
- /*
- * Since per-memcg caches are created asynchronously on first
- * allocation (see memcg_kmem_get_cache()), several threads can try to
- * create the same cache, but only one of them may succeed.
- */
- if (cache_from_memcg_idx(root_cache, id))
- return;
-
- cgroup_name(memcg->css.cgroup, memcg_name_buf, NAME_MAX + 1);
- cachep = memcg_create_kmem_cache(memcg, root_cache, memcg_name_buf);
- /*
- * If we could not create a memcg cache, do not complain, because
- * that's not critical at all as we can always proceed with the root
- * cache.
- */
- if (!cachep)
- return;
-
- list_add(&cachep->memcg_params->list, &memcg->memcg_slab_caches);
-
- /*
- * Since readers won't lock (see cache_from_memcg_idx()), we need a
- * barrier here to ensure nobody will see the kmem_cache partially
- * initialized.
- */
- smp_wmb();
-
- BUG_ON(root_cache->memcg_params->memcg_caches[id]);
- root_cache->memcg_params->memcg_caches[id] = cachep;
-}
-
-static void memcg_unregister_cache(struct kmem_cache *cachep)
-{
- struct kmem_cache *root_cache;
- struct mem_cgroup *memcg;
- int id;
-
- lockdep_assert_held(&memcg_slab_mutex);
-
- BUG_ON(is_root_cache(cachep));
-
- root_cache = cachep->memcg_params->root_cache;
- memcg = cachep->memcg_params->memcg;
- id = memcg_cache_id(memcg);
-
- BUG_ON(root_cache->memcg_params->memcg_caches[id] != cachep);
- root_cache->memcg_params->memcg_caches[id] = NULL;
-
- list_del(&cachep->memcg_params->list);
-
- kmem_cache_destroy(cachep);
-}
-
-int __memcg_cleanup_cache_params(struct kmem_cache *s)
-{
- struct kmem_cache *c;
- int i, failed = 0;
-
- mutex_lock(&memcg_slab_mutex);
- for_each_memcg_cache_index(i) {
- c = cache_from_memcg_idx(s, i);
- if (!c)
- continue;
-
- memcg_unregister_cache(c);
-
- if (cache_from_memcg_idx(s, i))
- failed++;
- }
- mutex_unlock(&memcg_slab_mutex);
- return failed;
-}
-
-static void memcg_unregister_all_caches(struct mem_cgroup *memcg)
-{
- struct kmem_cache *cachep;
- struct memcg_cache_params *params, *tmp;
-
- if (!memcg_kmem_is_active(memcg))
- return;
-
- mutex_lock(&memcg_slab_mutex);
- list_for_each_entry_safe(params, tmp, &memcg->memcg_slab_caches, list) {
- cachep = memcg_params_to_cache(params);
- memcg_unregister_cache(cachep);
- }
- mutex_unlock(&memcg_slab_mutex);
-}
-
-struct memcg_register_cache_work {
+struct memcg_kmem_cache_create_work {
struct mem_cgroup *memcg;
struct kmem_cache *cachep;
struct work_struct work;
};
-static void memcg_register_cache_func(struct work_struct *w)
+static void memcg_kmem_cache_create_func(struct work_struct *w)
{
- struct memcg_register_cache_work *cw =
- container_of(w, struct memcg_register_cache_work, work);
+ struct memcg_kmem_cache_create_work *cw =
+ container_of(w, struct memcg_kmem_cache_create_work, work);
struct mem_cgroup *memcg = cw->memcg;
struct kmem_cache *cachep = cw->cachep;
- mutex_lock(&memcg_slab_mutex);
- memcg_register_cache(memcg, cachep);
- mutex_unlock(&memcg_slab_mutex);
+ memcg_create_kmem_cache(memcg, cachep);
css_put(&memcg->css);
kfree(cw);
@@ -2730,10 +2601,10 @@ static void memcg_register_cache_func(struct work_struct *w)
/*
* Enqueue the creation of a per-memcg kmem_cache.
*/
-static void __memcg_schedule_register_cache(struct mem_cgroup *memcg,
- struct kmem_cache *cachep)
+static void __memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg,
+ struct kmem_cache *cachep)
{
- struct memcg_register_cache_work *cw;
+ struct memcg_kmem_cache_create_work *cw;
cw = kmalloc(sizeof(*cw), GFP_NOWAIT);
if (!cw)
@@ -2743,18 +2614,18 @@ static void __memcg_schedule_register_cache(struct mem_cgroup *memcg,
cw->memcg = memcg;
cw->cachep = cachep;
+ INIT_WORK(&cw->work, memcg_kmem_cache_create_func);
- INIT_WORK(&cw->work, memcg_register_cache_func);
schedule_work(&cw->work);
}
-static void memcg_schedule_register_cache(struct mem_cgroup *memcg,
- struct kmem_cache *cachep)
+static void memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg,
+ struct kmem_cache *cachep)
{
/*
* We need to stop accounting when we kmalloc, because if the
* corresponding kmalloc cache is not yet created, the first allocation
- * in __memcg_schedule_register_cache will recurse.
+ * in __memcg_schedule_kmem_cache_create will recurse.
*
* However, it is better to enclose the whole function. Depending on
* the debugging options enabled, INIT_WORK(), for instance, can
@@ -2763,24 +2634,10 @@ static void memcg_schedule_register_cache(struct mem_cgroup *memcg,
* the safest choice is to do it like this, wrapping the whole function.
*/
current->memcg_kmem_skip_account = 1;
- __memcg_schedule_register_cache(memcg, cachep);
+ __memcg_schedule_kmem_cache_create(memcg, cachep);
current->memcg_kmem_skip_account = 0;
}
-int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order)
-{
- unsigned int nr_pages = 1 << order;
-
- return memcg_charge_kmem(cachep->memcg_params->memcg, gfp, nr_pages);
-}
-
-void __memcg_uncharge_slab(struct kmem_cache *cachep, int order)
-{
- unsigned int nr_pages = 1 << order;
-
- memcg_uncharge_kmem(cachep->memcg_params->memcg, nr_pages);
-}
-
/*
* Return the kmem_cache we're supposed to use for a slab allocation.
* We try to use the current memcg's version of the cache.
@@ -2825,7 +2682,7 @@ struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep)
* could happen with the slab_mutex held. So it's better to
* defer everything.
*/
- memcg_schedule_register_cache(memcg, cachep);
+ memcg_schedule_kmem_cache_create(memcg, cachep);
out:
css_put(&memcg->css);
return cachep;
@@ -4154,7 +4011,7 @@ static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
static void memcg_destroy_kmem(struct mem_cgroup *memcg)
{
- memcg_unregister_all_caches(memcg);
+ memcg_destroy_kmem_caches(memcg);
mem_cgroup_sockets_destroy(memcg);
}
#else
@@ -4682,7 +4539,6 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
spin_lock_init(&memcg->event_list_lock);
#ifdef CONFIG_MEMCG_KMEM
memcg->kmemcg_id = -1;
- INIT_LIST_HEAD(&memcg->memcg_slab_caches);
#endif
return &memcg->css;
@@ -4926,10 +4782,7 @@ static struct page *mc_handle_file_pte(struct vm_area_struct *vma,
return NULL;
mapping = vma->vm_file->f_mapping;
- if (pte_none(ptent))
- pgoff = linear_page_index(vma, addr);
- else /* pte_file(ptent) is true */
- pgoff = pte_to_pgoff(ptent);
+ pgoff = linear_page_index(vma, addr);
/* page is moved even if it's not RSS of this task(page-faulted). */
#ifdef CONFIG_SWAP
@@ -4961,7 +4814,7 @@ static enum mc_target_type get_mctgt_type(struct vm_area_struct *vma,
page = mc_handle_present_pte(vma, addr, ptent);
else if (is_swap_pte(ptent))
page = mc_handle_swap_pte(vma, addr, ptent, &ent);
- else if (pte_none(ptent) || pte_file(ptent))
+ else if (pte_none(ptent))
page = mc_handle_file_pte(vma, addr, ptent, &ent);
if (!page && !ent.val)
diff --git a/mm/memory.c b/mm/memory.c
index d707c4dfbbb4..d63849b5188f 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -813,42 +813,40 @@ copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
/* pte contains position in swap or file, so copy. */
if (unlikely(!pte_present(pte))) {
- if (!pte_file(pte)) {
- swp_entry_t entry = pte_to_swp_entry(pte);
-
- if (likely(!non_swap_entry(entry))) {
- if (swap_duplicate(entry) < 0)
- return entry.val;
-
- /* make sure dst_mm is on swapoff's mmlist. */
- if (unlikely(list_empty(&dst_mm->mmlist))) {
- spin_lock(&mmlist_lock);
- if (list_empty(&dst_mm->mmlist))
- list_add(&dst_mm->mmlist,
- &src_mm->mmlist);
- spin_unlock(&mmlist_lock);
- }
- rss[MM_SWAPENTS]++;
- } else if (is_migration_entry(entry)) {
- page = migration_entry_to_page(entry);
-
- if (PageAnon(page))
- rss[MM_ANONPAGES]++;
- else
- rss[MM_FILEPAGES]++;
-
- if (is_write_migration_entry(entry) &&
- is_cow_mapping(vm_flags)) {
- /*
- * COW mappings require pages in both
- * parent and child to be set to read.
- */
- make_migration_entry_read(&entry);
- pte = swp_entry_to_pte(entry);
- if (pte_swp_soft_dirty(*src_pte))
- pte = pte_swp_mksoft_dirty(pte);
- set_pte_at(src_mm, addr, src_pte, pte);
- }
+ swp_entry_t entry = pte_to_swp_entry(pte);
+
+ if (likely(!non_swap_entry(entry))) {
+ if (swap_duplicate(entry) < 0)
+ return entry.val;
+
+ /* make sure dst_mm is on swapoff's mmlist. */
+ if (unlikely(list_empty(&dst_mm->mmlist))) {
+ spin_lock(&mmlist_lock);
+ if (list_empty(&dst_mm->mmlist))
+ list_add(&dst_mm->mmlist,
+ &src_mm->mmlist);
+ spin_unlock(&mmlist_lock);
+ }
+ rss[MM_SWAPENTS]++;
+ } else if (is_migration_entry(entry)) {
+ page = migration_entry_to_page(entry);
+
+ if (PageAnon(page))
+ rss[MM_ANONPAGES]++;
+ else
+ rss[MM_FILEPAGES]++;
+
+ if (is_write_migration_entry(entry) &&
+ is_cow_mapping(vm_flags)) {
+ /*
+ * COW mappings require pages in both
+ * parent and child to be set to read.
+ */
+ make_migration_entry_read(&entry);
+ pte = swp_entry_to_pte(entry);
+ if (pte_swp_soft_dirty(*src_pte))
+ pte = pte_swp_mksoft_dirty(pte);
+ set_pte_at(src_mm, addr, src_pte, pte);
}
}
goto out_set_pte;
@@ -1022,11 +1020,9 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
* readonly mappings. The tradeoff is that copy_page_range is more
* efficient than faulting.
*/
- if (!(vma->vm_flags & (VM_HUGETLB | VM_NONLINEAR |
- VM_PFNMAP | VM_MIXEDMAP))) {
- if (!vma->anon_vma)
- return 0;
- }
+ if (!(vma->vm_flags & (VM_HUGETLB | VM_PFNMAP | VM_MIXEDMAP)) &&
+ !vma->anon_vma)
+ return 0;
if (is_vm_hugetlb_page(vma))
return copy_hugetlb_page_range(dst_mm, src_mm, vma);
@@ -1084,6 +1080,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
spinlock_t *ptl;
pte_t *start_pte;
pte_t *pte;
+ swp_entry_t entry;
again:
init_rss_vec(rss);
@@ -1109,28 +1106,12 @@ again:
if (details->check_mapping &&
details->check_mapping != page->mapping)
continue;
- /*
- * Each page->index must be checked when
- * invalidating or truncating nonlinear.
- */
- if (details->nonlinear_vma &&
- (page->index < details->first_index ||
- page->index > details->last_index))
- continue;
}
ptent = ptep_get_and_clear_full(mm, addr, pte,
tlb->fullmm);
tlb_remove_tlb_entry(tlb, pte, addr);
if (unlikely(!page))
continue;
- if (unlikely(details) && details->nonlinear_vma
- && linear_page_index(details->nonlinear_vma,
- addr) != page->index) {
- pte_t ptfile = pgoff_to_pte(page->index);
- if (pte_soft_dirty(ptent))
- ptfile = pte_file_mksoft_dirty(ptfile);
- set_pte_at(mm, addr, pte, ptfile);
- }
if (PageAnon(page))
rss[MM_ANONPAGES]--;
else {
@@ -1153,33 +1134,25 @@ again:
}
continue;
}
- /*
- * If details->check_mapping, we leave swap entries;
- * if details->nonlinear_vma, we leave file entries.
- */
+ /* If details->check_mapping, we leave swap entries. */
if (unlikely(details))
continue;
- if (pte_file(ptent)) {
- if (unlikely(!(vma->vm_flags & VM_NONLINEAR)))
- print_bad_pte(vma, addr, ptent, NULL);
- } else {
- swp_entry_t entry = pte_to_swp_entry(ptent);
- if (!non_swap_entry(entry))
- rss[MM_SWAPENTS]--;
- else if (is_migration_entry(entry)) {
- struct page *page;
+ entry = pte_to_swp_entry(ptent);
+ if (!non_swap_entry(entry))
+ rss[MM_SWAPENTS]--;
+ else if (is_migration_entry(entry)) {
+ struct page *page;
- page = migration_entry_to_page(entry);
+ page = migration_entry_to_page(entry);
- if (PageAnon(page))
- rss[MM_ANONPAGES]--;
- else
- rss[MM_FILEPAGES]--;
- }
- if (unlikely(!free_swap_and_cache(entry)))
- print_bad_pte(vma, addr, ptent, NULL);
+ if (PageAnon(page))
+ rss[MM_ANONPAGES]--;
+ else
+ rss[MM_FILEPAGES]--;
}
+ if (unlikely(!free_swap_and_cache(entry)))
+ print_bad_pte(vma, addr, ptent, NULL);
pte_clear_not_present_full(mm, addr, pte, tlb->fullmm);
} while (pte++, addr += PAGE_SIZE, addr != end);
@@ -1279,7 +1252,7 @@ static void unmap_page_range(struct mmu_gather *tlb,
pgd_t *pgd;
unsigned long next;
- if (details && !details->check_mapping && !details->nonlinear_vma)
+ if (details && !details->check_mapping)
details = NULL;
BUG_ON(addr >= end);
@@ -1373,7 +1346,7 @@ void unmap_vmas(struct mmu_gather *tlb,
* @vma: vm_area_struct holding the applicable pages
* @start: starting address of pages to zap
* @size: number of bytes to zap
- * @details: details of nonlinear truncation or shared cache invalidation
+ * @details: details of shared cache invalidation
*
* Caller must protect the VMA list
*/
@@ -1399,7 +1372,7 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
* @vma: vm_area_struct holding the applicable pages
* @address: starting address of pages to zap
* @size: number of bytes to zap
- * @details: details of nonlinear truncation or shared cache invalidation
+ * @details: details of shared cache invalidation
*
* The range must fit into one VMA.
*/
@@ -1924,12 +1897,11 @@ int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
EXPORT_SYMBOL_GPL(apply_to_page_range);
/*
- * handle_pte_fault chooses page fault handler according to an entry
- * which was read non-atomically. Before making any commitment, on
- * those architectures or configurations (e.g. i386 with PAE) which
- * might give a mix of unmatched parts, do_swap_page and do_nonlinear_fault
- * must check under lock before unmapping the pte and proceeding
- * (but do_wp_page is only called after already making such a check;
+ * handle_pte_fault chooses page fault handler according to an entry which was
+ * read non-atomically. Before making any commitment, on those architectures
+ * or configurations (e.g. i386 with PAE) which might give a mix of unmatched
+ * parts, do_swap_page must check under lock before unmapping the pte and
+ * proceeding (but do_wp_page is only called after already making such a check;
* and do_anonymous_page can safely check later on).
*/
static inline int pte_unmap_same(struct mm_struct *mm, pmd_t *pmd,
@@ -2035,7 +2007,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
pte_t entry;
int ret = 0;
int page_mkwrite = 0;
- struct page *dirty_page = NULL;
+ bool dirty_shared = false;
unsigned long mmun_start = 0; /* For mmu_notifiers */
unsigned long mmun_end = 0; /* For mmu_notifiers */
struct mem_cgroup *memcg;
@@ -2086,6 +2058,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
unlock_page(old_page);
} else if (unlikely((vma->vm_flags & (VM_WRITE|VM_SHARED)) ==
(VM_WRITE|VM_SHARED))) {
+ page_cache_get(old_page);
/*
* Only catch write-faults on shared writable pages,
* read-only shared pages can get COWed by
@@ -2093,7 +2066,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
*/
if (vma->vm_ops && vma->vm_ops->page_mkwrite) {
int tmp;
- page_cache_get(old_page);
+
pte_unmap_unlock(page_table, ptl);
tmp = do_page_mkwrite(vma, old_page, address);
if (unlikely(!tmp || (tmp &
@@ -2113,11 +2086,10 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
unlock_page(old_page);
goto unlock;
}
-
page_mkwrite = 1;
}
- dirty_page = old_page;
- get_page(dirty_page);
+
+ dirty_shared = true;
reuse:
/*
@@ -2136,20 +2108,20 @@ reuse:
pte_unmap_unlock(page_table, ptl);
ret |= VM_FAULT_WRITE;
- if (!dirty_page)
- return ret;
-
- if (!page_mkwrite) {
+ if (dirty_shared) {
struct address_space *mapping;
int dirtied;
- lock_page(dirty_page);
- dirtied = set_page_dirty(dirty_page);
- VM_BUG_ON_PAGE(PageAnon(dirty_page), dirty_page);
- mapping = dirty_page->mapping;
- unlock_page(dirty_page);
+ if (!page_mkwrite)
+ lock_page(old_page);
- if (dirtied && mapping) {
+ dirtied = set_page_dirty(old_page);
+ VM_BUG_ON_PAGE(PageAnon(old_page), old_page);
+ mapping = old_page->mapping;
+ unlock_page(old_page);
+ page_cache_release(old_page);
+
+ if ((dirtied || page_mkwrite) && mapping) {
/*
* Some device drivers do not set page.mapping
* but still dirty their pages
@@ -2157,25 +2129,9 @@ reuse:
balance_dirty_pages_ratelimited(mapping);
}
- /* file_update_time outside page_lock */
- if (vma->vm_file)
+ if (!page_mkwrite)
file_update_time(vma->vm_file);
}
- put_page(dirty_page);
- if (page_mkwrite) {
- struct address_space *mapping = dirty_page->mapping;
-
- set_page_dirty(dirty_page);
- unlock_page(dirty_page);
- page_cache_release(dirty_page);
- if (mapping) {
- /*
- * Some device drivers do not set page.mapping
- * but still dirty their pages
- */
- balance_dirty_pages_ratelimited(mapping);
- }
- }
return ret;
}
@@ -2333,25 +2289,11 @@ static inline void unmap_mapping_range_tree(struct rb_root *root,
}
}
-static inline void unmap_mapping_range_list(struct list_head *head,
- struct zap_details *details)
-{
- struct vm_area_struct *vma;
-
- /*
- * In nonlinear VMAs there is no correspondence between virtual address
- * offset and file offset. So we must perform an exhaustive search
- * across *all* the pages in each nonlinear VMA, not just the pages
- * whose virtual address lies outside the file truncation point.
- */
- list_for_each_entry(vma, head, shared.nonlinear) {
- details->nonlinear_vma = vma;
- unmap_mapping_range_vma(vma, vma->vm_start, vma->vm_end, details);
- }
-}
-
/**
- * unmap_mapping_range - unmap the portion of all mmaps in the specified address_space corresponding to the specified page range in the underlying file.
+ * unmap_mapping_range - unmap the portion of all mmaps in the specified
+ * address_space corresponding to the specified page range in the underlying
+ * file.
+ *
* @mapping: the address space containing mmaps to be unmapped.
* @holebegin: byte in first page to unmap, relative to the start of
* the underlying file. This will be rounded down to a PAGE_SIZE
@@ -2380,7 +2322,6 @@ void unmap_mapping_range(struct address_space *mapping,
}
details.check_mapping = even_cows? NULL: mapping;
- details.nonlinear_vma = NULL;
details.first_index = hba;
details.last_index = hba + hlen - 1;
if (details.last_index < details.first_index)
@@ -2390,8 +2331,6 @@ void unmap_mapping_range(struct address_space *mapping,
i_mmap_lock_write(mapping);
if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap)))
unmap_mapping_range_tree(&mapping->i_mmap, &details);
- if (unlikely(!list_empty(&mapping->i_mmap_nonlinear)))
- unmap_mapping_range_list(&mapping->i_mmap_nonlinear, &details);
i_mmap_unlock_write(mapping);
}
EXPORT_SYMBOL(unmap_mapping_range);
@@ -2752,8 +2691,6 @@ void do_set_pte(struct vm_area_struct *vma, unsigned long address,
entry = mk_pte(page, vma->vm_page_prot);
if (write)
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
- else if (pte_file(*pte) && pte_file_soft_dirty(*pte))
- entry = pte_mksoft_dirty(entry);
if (anon) {
inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
page_add_new_anon_rmap(page, vma, address);
@@ -2888,8 +2825,7 @@ static int do_read_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* if page by the offset is not ready to be mapped (cold cache or
* something).
*/
- if (vma->vm_ops->map_pages && !(flags & FAULT_FLAG_NONLINEAR) &&
- fault_around_bytes >> PAGE_SHIFT > 1) {
+ if (vma->vm_ops->map_pages && fault_around_bytes >> PAGE_SHIFT > 1) {
pte = pte_offset_map_lock(mm, pmd, address, &ptl);
do_fault_around(vma, address, pte, pgoff, flags);
if (!pte_same(*pte, orig_pte))
@@ -3021,8 +2957,7 @@ static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma,
balance_dirty_pages_ratelimited(mapping);
}
- /* file_update_time outside page_lock */
- if (vma->vm_file && !vma->vm_ops->page_mkwrite)
+ if (!vma->vm_ops->page_mkwrite)
file_update_time(vma->vm_file);
return ret;
@@ -3034,7 +2969,7 @@ static int do_shared_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* The mmap_sem may have been released depending on flags and our
* return value. See filemap_fault() and __lock_page_or_retry().
*/
-static int do_linear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
+static int do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, pte_t *page_table, pmd_t *pmd,
unsigned int flags, pte_t orig_pte)
{
@@ -3051,46 +2986,6 @@ static int do_linear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
return do_shared_fault(mm, vma, address, pmd, pgoff, flags, orig_pte);
}
-/*
- * Fault of a previously existing named mapping. Repopulate the pte
- * from the encoded file_pte if possible. This enables swappable
- * nonlinear vmas.
- *
- * We enter with non-exclusive mmap_sem (to exclude vma changes,
- * but allow concurrent faults), and pte mapped but not yet locked.
- * We return with pte unmapped and unlocked.
- * The mmap_sem may have been released depending on flags and our
- * return value. See filemap_fault() and __lock_page_or_retry().
- */
-static int do_nonlinear_fault(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, pte_t *page_table, pmd_t *pmd,
- unsigned int flags, pte_t orig_pte)
-{
- pgoff_t pgoff;
-
- flags |= FAULT_FLAG_NONLINEAR;
-
- if (!pte_unmap_same(mm, pmd, page_table, orig_pte))
- return 0;
-
- if (unlikely(!(vma->vm_flags & VM_NONLINEAR))) {
- /*
- * Page table corrupted: show pte and kill process.
- */
- print_bad_pte(vma, address, orig_pte, NULL);
- return VM_FAULT_SIGBUS;
- }
-
- pgoff = pte_to_pgoff(orig_pte);
- if (!(flags & FAULT_FLAG_WRITE))
- return do_read_fault(mm, vma, address, pmd, pgoff, flags,
- orig_pte);
- if (!(vma->vm_flags & VM_SHARED))
- return do_cow_fault(mm, vma, address, pmd, pgoff, flags,
- orig_pte);
- return do_shared_fault(mm, vma, address, pmd, pgoff, flags, orig_pte);
-}
-
static int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
unsigned long addr, int page_nid,
int *flags)
@@ -3218,15 +3113,12 @@ static int handle_pte_fault(struct mm_struct *mm,
if (pte_none(entry)) {
if (vma->vm_ops) {
if (likely(vma->vm_ops->fault))
- return do_linear_fault(mm, vma, address,
- pte, pmd, flags, entry);
+ return do_fault(mm, vma, address, pte,
+ pmd, flags, entry);
}
return do_anonymous_page(mm, vma, address,
pte, pmd, flags);
}
- if (pte_file(entry))
- return do_nonlinear_fault(mm, vma, address,
- pte, pmd, flags, entry);
return do_swap_page(mm, vma, address,
pte, pmd, flags, entry);
}
diff --git a/mm/migrate.c b/mm/migrate.c
index 344cdf692fc8..6e284bcca8bb 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -179,37 +179,6 @@ out:
}
/*
- * Congratulations to trinity for discovering this bug.
- * mm/fremap.c's remap_file_pages() accepts any range within a single vma to
- * convert that vma to VM_NONLINEAR; and generic_file_remap_pages() will then
- * replace the specified range by file ptes throughout (maybe populated after).
- * If page migration finds a page within that range, while it's still located
- * by vma_interval_tree rather than lost to i_mmap_nonlinear list, no problem:
- * zap_pte() clears the temporary migration entry before mmap_sem is dropped.
- * But if the migrating page is in a part of the vma outside the range to be
- * remapped, then it will not be cleared, and remove_migration_ptes() needs to
- * deal with it. Fortunately, this part of the vma is of course still linear,
- * so we just need to use linear location on the nonlinear list.
- */
-static int remove_linear_migration_ptes_from_nonlinear(struct page *page,
- struct address_space *mapping, void *arg)
-{
- struct vm_area_struct *vma;
- /* hugetlbfs does not support remap_pages, so no huge pgoff worries */
- pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
- unsigned long addr;
-
- list_for_each_entry(vma,
- &mapping->i_mmap_nonlinear, shared.nonlinear) {
-
- addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
- if (addr >= vma->vm_start && addr < vma->vm_end)
- remove_migration_pte(page, vma, addr, arg);
- }
- return SWAP_AGAIN;
-}
-
-/*
* Get rid of all migration entries and replace them by
* references to the indicated page.
*/
@@ -218,7 +187,6 @@ static void remove_migration_ptes(struct page *old, struct page *new)
struct rmap_walk_control rwc = {
.rmap_one = remove_migration_pte,
.arg = old,
- .file_nonlinear = remove_linear_migration_ptes_from_nonlinear,
};
rmap_walk(new, &rwc);
diff --git a/mm/mincore.c b/mm/mincore.c
index c8c528b36641..46527c023e0c 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -124,17 +124,13 @@ static void mincore_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
ptep = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
do {
pte_t pte = *ptep;
- pgoff_t pgoff;
next = addr + PAGE_SIZE;
if (pte_none(pte))
mincore_unmapped_range(vma, addr, next, vec);
else if (pte_present(pte))
*vec = 1;
- else if (pte_file(pte)) {
- pgoff = pte_to_pgoff(pte);
- *vec = mincore_page(vma->vm_file->f_mapping, pgoff);
- } else { /* pte is a swap entry */
+ else { /* pte is a swap entry */
swp_entry_t entry = pte_to_swp_entry(pte);
if (non_swap_entry(entry)) {
@@ -145,9 +141,8 @@ static void mincore_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
*vec = 1;
} else {
#ifdef CONFIG_SWAP
- pgoff = entry.val;
*vec = mincore_page(swap_address_space(entry),
- pgoff);
+ entry.val);
#else
WARN_ON(1);
*vec = 1;
diff --git a/mm/mmap.c b/mm/mmap.c
index 7f684d5a8087..14d84666e8ba 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -243,10 +243,7 @@ static void __remove_shared_vm_struct(struct vm_area_struct *vma,
mapping_unmap_writable(mapping);
flush_dcache_mmap_lock(mapping);
- if (unlikely(vma->vm_flags & VM_NONLINEAR))
- list_del_init(&vma->shared.nonlinear);
- else
- vma_interval_tree_remove(vma, &mapping->i_mmap);
+ vma_interval_tree_remove(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
}
@@ -649,10 +646,7 @@ static void __vma_link_file(struct vm_area_struct *vma)
atomic_inc(&mapping->i_mmap_writable);
flush_dcache_mmap_lock(mapping);
- if (unlikely(vma->vm_flags & VM_NONLINEAR))
- vma_nonlinear_insert(vma, &mapping->i_mmap_nonlinear);
- else
- vma_interval_tree_insert(vma, &mapping->i_mmap);
+ vma_interval_tree_insert(vma, &mapping->i_mmap);
flush_dcache_mmap_unlock(mapping);
}
}
@@ -789,14 +783,11 @@ again: remove_next = 1 + (end > next->vm_end);
if (file) {
mapping = file->f_mapping;
- if (!(vma->vm_flags & VM_NONLINEAR)) {
- root = &mapping->i_mmap;
- uprobe_munmap(vma, vma->vm_start, vma->vm_end);
+ root = &mapping->i_mmap;
+ uprobe_munmap(vma, vma->vm_start, vma->vm_end);
- if (adjust_next)
- uprobe_munmap(next, next->vm_start,
- next->vm_end);
- }
+ if (adjust_next)
+ uprobe_munmap(next, next->vm_start, next->vm_end);
i_mmap_lock_write(mapping);
if (insert) {
@@ -2634,6 +2625,75 @@ SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
return vm_munmap(addr, len);
}
+
+/*
+ * Emulation of deprecated remap_file_pages() syscall.
+ */
+SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
+ unsigned long, prot, unsigned long, pgoff, unsigned long, flags)
+{
+
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma;
+ unsigned long populate = 0;
+ unsigned long ret = -EINVAL;
+ struct file *file;
+
+ pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. "
+ "See Documentation/vm/remap_file_pages.txt.\n",
+ current->comm, current->pid);
+
+ if (prot)
+ return ret;
+ start = start & PAGE_MASK;
+ size = size & PAGE_MASK;
+
+ if (start + size <= start)
+ return ret;
+
+ /* Does pgoff wrap? */
+ if (pgoff + (size >> PAGE_SHIFT) < pgoff)
+ return ret;
+
+ down_write(&mm->mmap_sem);
+ vma = find_vma(mm, start);
+
+ if (!vma || !(vma->vm_flags & VM_SHARED))
+ goto out;
+
+ if (start < vma->vm_start || start + size > vma->vm_end)
+ goto out;
+
+ if (pgoff == linear_page_index(vma, start)) {
+ ret = 0;
+ goto out;
+ }
+
+ prot |= vma->vm_flags & VM_READ ? PROT_READ : 0;
+ prot |= vma->vm_flags & VM_WRITE ? PROT_WRITE : 0;
+ prot |= vma->vm_flags & VM_EXEC ? PROT_EXEC : 0;
+
+ flags &= MAP_NONBLOCK;
+ flags |= MAP_SHARED | MAP_FIXED | MAP_POPULATE;
+ if (vma->vm_flags & VM_LOCKED) {
+ flags |= MAP_LOCKED;
+ /* drop PG_Mlocked flag for over-mapped range */
+ munlock_vma_pages_range(vma, start, start + size);
+ }
+
+ file = get_file(vma->vm_file);
+ ret = do_mmap_pgoff(vma->vm_file, start, size,
+ prot, flags, pgoff, &populate);
+ fput(file);
+out:
+ up_write(&mm->mmap_sem);
+ if (populate)
+ mm_populate(ret, populate);
+ if (!IS_ERR_VALUE(ret))
+ ret = 0;
+ return ret;
+}
+
static inline void verify_mm_writelocked(struct mm_struct *mm)
{
#ifdef CONFIG_DEBUG_VM
@@ -3108,8 +3168,7 @@ static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping)
*
* mmap_sem in write mode is required in order to block all operations
* that could modify pagetables and free pages without need of
- * altering the vma layout (for example populate_range() with
- * nonlinear vmas). It's also needed in write mode to avoid new
+ * altering the vma layout. It's also needed in write mode to avoid new
* anon_vmas to be associated with existing vmas.
*
* A single task can't take more than one mm_take_all_locks() in a row
diff --git a/mm/mprotect.c b/mm/mprotect.c
index ace93454ce8e..33121662f08b 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -105,7 +105,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
}
if (updated)
pages++;
- } else if (IS_ENABLED(CONFIG_MIGRATION) && !pte_file(oldpte)) {
+ } else if (IS_ENABLED(CONFIG_MIGRATION)) {
swp_entry_t entry = pte_to_swp_entry(oldpte);
if (is_write_migration_entry(entry)) {
diff --git a/mm/mremap.c b/mm/mremap.c
index 17fa018f5f39..57dadc025c64 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -81,8 +81,6 @@ static pte_t move_soft_dirty_pte(pte_t pte)
pte = pte_mksoft_dirty(pte);
else if (is_swap_pte(pte))
pte = pte_swp_mksoft_dirty(pte);
- else if (pte_file(pte))
- pte = pte_file_mksoft_dirty(pte);
#endif
return pte;
}
diff --git a/mm/msync.c b/mm/msync.c
index 992a1673d488..bb04d53ae852 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -86,10 +86,7 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
(vma->vm_flags & VM_SHARED)) {
get_file(file);
up_read(&mm->mmap_sem);
- if (vma->vm_flags & VM_NONLINEAR)
- error = vfs_fsync(file, 1);
- else
- error = vfs_fsync_range(file, fstart, fend, 1);
+ error = vfs_fsync_range(file, fstart, fend, 1);
fput(file);
if (error || start >= end)
goto out;
diff --git a/mm/nommu.c b/mm/nommu.c
index 28bd8c4dff6f..541bed64e348 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1984,14 +1984,6 @@ void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf)
}
EXPORT_SYMBOL(filemap_map_pages);
-int generic_file_remap_pages(struct vm_area_struct *vma, unsigned long addr,
- unsigned long size, pgoff_t pgoff)
-{
- BUG();
- return 0;
-}
-EXPORT_SYMBOL(generic_file_remap_pages);
-
static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
unsigned long addr, void *buf, int len, int write)
{
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8e20f9c2fa5a..f121050e8530 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -552,17 +552,15 @@ static inline int page_is_buddy(struct page *page, struct page *buddy,
return 0;
if (page_is_guard(buddy) && page_order(buddy) == order) {
- VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
-
if (page_zone_id(page) != page_zone_id(buddy))
return 0;
+ VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
+
return 1;
}
if (PageBuddy(buddy) && page_order(buddy) == order) {
- VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
-
/*
* zone check is done late to avoid uselessly
* calculating zone/node ids for pages that could
@@ -571,6 +569,8 @@ static inline int page_is_buddy(struct page *page, struct page *buddy,
if (page_zone_id(page) != page_zone_id(buddy))
return 0;
+ VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
+
return 1;
}
return 0;
diff --git a/mm/rmap.c b/mm/rmap.c
index 71cd5bd0c17d..70b32498d4f2 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -590,9 +590,8 @@ unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
if (!vma->anon_vma || !page__anon_vma ||
vma->anon_vma->root != page__anon_vma->root)
return -EFAULT;
- } else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) {
- if (!vma->vm_file ||
- vma->vm_file->f_mapping != page->mapping)
+ } else if (page->mapping) {
+ if (!vma->vm_file || vma->vm_file->f_mapping != page->mapping)
return -EFAULT;
} else
return -EFAULT;
@@ -1274,7 +1273,6 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
if (pte_soft_dirty(pteval))
swp_pte = pte_swp_mksoft_dirty(swp_pte);
set_pte_at(mm, address, pte, swp_pte);
- BUG_ON(pte_file(*pte));
} else if (IS_ENABLED(CONFIG_MIGRATION) &&
(flags & TTU_MIGRATION)) {
/* Establish migration entry for a file page */
@@ -1316,211 +1314,6 @@ out_mlock:
return ret;
}
-/*
- * objrmap doesn't work for nonlinear VMAs because the assumption that
- * offset-into-file correlates with offset-into-virtual-addresses does not hold.
- * Consequently, given a particular page and its ->index, we cannot locate the
- * ptes which are mapping that page without an exhaustive linear search.
- *
- * So what this code does is a mini "virtual scan" of each nonlinear VMA which
- * maps the file to which the target page belongs. The ->vm_private_data field
- * holds the current cursor into that scan. Successive searches will circulate
- * around the vma's virtual address space.
- *
- * So as more replacement pressure is applied to the pages in a nonlinear VMA,
- * more scanning pressure is placed against them as well. Eventually pages
- * will become fully unmapped and are eligible for eviction.
- *
- * For very sparsely populated VMAs this is a little inefficient - chances are
- * there there won't be many ptes located within the scan cluster. In this case
- * maybe we could scan further - to the end of the pte page, perhaps.
- *
- * Mlocked pages: check VM_LOCKED under mmap_sem held for read, if we can
- * acquire it without blocking. If vma locked, mlock the pages in the cluster,
- * rather than unmapping them. If we encounter the "check_page" that vmscan is
- * trying to unmap, return SWAP_MLOCK, else default SWAP_AGAIN.
- */
-#define CLUSTER_SIZE min(32*PAGE_SIZE, PMD_SIZE)
-#define CLUSTER_MASK (~(CLUSTER_SIZE - 1))
-
-static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
- struct vm_area_struct *vma, struct page *check_page)
-{
- struct mm_struct *mm = vma->vm_mm;
- pmd_t *pmd;
- pte_t *pte;
- pte_t pteval;
- spinlock_t *ptl;
- struct page *page;
- unsigned long address;
- unsigned long mmun_start; /* For mmu_notifiers */
- unsigned long mmun_end; /* For mmu_notifiers */
- unsigned long end;
- int ret = SWAP_AGAIN;
- int locked_vma = 0;
-
- address = (vma->vm_start + cursor) & CLUSTER_MASK;
- end = address + CLUSTER_SIZE;
- if (address < vma->vm_start)
- address = vma->vm_start;
- if (end > vma->vm_end)
- end = vma->vm_end;
-
- pmd = mm_find_pmd(mm, address);
- if (!pmd)
- return ret;
-
- mmun_start = address;
- mmun_end = end;
- mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
-
- /*
- * If we can acquire the mmap_sem for read, and vma is VM_LOCKED,
- * keep the sem while scanning the cluster for mlocking pages.
- */
- if (down_read_trylock(&vma->vm_mm->mmap_sem)) {
- locked_vma = (vma->vm_flags & VM_LOCKED);
- if (!locked_vma)
- up_read(&vma->vm_mm->mmap_sem); /* don't need it */
- }
-
- pte = pte_offset_map_lock(mm, pmd, address, &ptl);
-
- /* Update high watermark before we lower rss */
- update_hiwater_rss(mm);
-
- for (; address < end; pte++, address += PAGE_SIZE) {
- if (!pte_present(*pte))
- continue;
- page = vm_normal_page(vma, address, *pte);
- BUG_ON(!page || PageAnon(page));
-
- if (locked_vma) {
- if (page == check_page) {
- /* we know we have check_page locked */
- mlock_vma_page(page);
- ret = SWAP_MLOCK;
- } else if (trylock_page(page)) {
- /*
- * If we can lock the page, perform mlock.
- * Otherwise leave the page alone, it will be
- * eventually encountered again later.
- */
- mlock_vma_page(page);
- unlock_page(page);
- }
- continue; /* don't unmap */
- }
-
- /*
- * No need for _notify because we're within an
- * mmu_notifier_invalidate_range_ {start|end} scope.
- */
- if (ptep_clear_flush_young(vma, address, pte))
- continue;
-
- /* Nuke the page table entry. */
- flush_cache_page(vma, address, pte_pfn(*pte));
- pteval = ptep_clear_flush_notify(vma, address, pte);
-
- /* If nonlinear, store the file page offset in the pte. */
- if (page->index != linear_page_index(vma, address)) {
- pte_t ptfile = pgoff_to_pte(page->index);
- if (pte_soft_dirty(pteval))
- ptfile = pte_file_mksoft_dirty(ptfile);
- set_pte_at(mm, address, pte, ptfile);
- }
-
- /* Move the dirty bit to the physical page now the pte is gone. */
- if (pte_dirty(pteval))
- set_page_dirty(page);
-
- page_remove_rmap(page);
- page_cache_release(page);
- dec_mm_counter(mm, MM_FILEPAGES);
- (*mapcount)--;
- }
- pte_unmap_unlock(pte - 1, ptl);
- mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
- if (locked_vma)
- up_read(&vma->vm_mm->mmap_sem);
- return ret;
-}
-
-static int try_to_unmap_nonlinear(struct page *page,
- struct address_space *mapping, void *arg)
-{
- struct vm_area_struct *vma;
- int ret = SWAP_AGAIN;
- unsigned long cursor;
- unsigned long max_nl_cursor = 0;
- unsigned long max_nl_size = 0;
- unsigned int mapcount;
-
- list_for_each_entry(vma,
- &mapping->i_mmap_nonlinear, shared.nonlinear) {
-
- cursor = (unsigned long) vma->vm_private_data;
- if (cursor > max_nl_cursor)
- max_nl_cursor = cursor;
- cursor = vma->vm_end - vma->vm_start;
- if (cursor > max_nl_size)
- max_nl_size = cursor;
- }
-
- if (max_nl_size == 0) { /* all nonlinears locked or reserved ? */
- return SWAP_FAIL;
- }
-
- /*
- * We don't try to search for this page in the nonlinear vmas,
- * and page_referenced wouldn't have found it anyway. Instead
- * just walk the nonlinear vmas trying to age and unmap some.
- * The mapcount of the page we came in with is irrelevant,
- * but even so use it as a guide to how hard we should try?
- */
- mapcount = page_mapcount(page);
- if (!mapcount)
- return ret;
-
- cond_resched();
-
- max_nl_size = (max_nl_size + CLUSTER_SIZE - 1) & CLUSTER_MASK;
- if (max_nl_cursor == 0)
- max_nl_cursor = CLUSTER_SIZE;
-
- do {
- list_for_each_entry(vma,
- &mapping->i_mmap_nonlinear, shared.nonlinear) {
-
- cursor = (unsigned long) vma->vm_private_data;
- while (cursor < max_nl_cursor &&
- cursor < vma->vm_end - vma->vm_start) {
- if (try_to_unmap_cluster(cursor, &mapcount,
- vma, page) == SWAP_MLOCK)
- ret = SWAP_MLOCK;
- cursor += CLUSTER_SIZE;
- vma->vm_private_data = (void *) cursor;
- if ((int)mapcount <= 0)
- return ret;
- }
- vma->vm_private_data = (void *) max_nl_cursor;
- }
- cond_resched();
- max_nl_cursor += CLUSTER_SIZE;
- } while (max_nl_cursor <= max_nl_size);
-
- /*
- * Don't loop forever (perhaps all the remaining pages are
- * in locked vmas). Reset cursor on all unreserved nonlinear
- * vmas, now forgetting on which ones it had fallen behind.
- */
- list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.nonlinear)
- vma->vm_private_data = NULL;
-
- return ret;
-}
-
bool is_vma_temporary_stack(struct vm_area_struct *vma)
{
int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP);
@@ -1566,7 +1359,6 @@ int try_to_unmap(struct page *page, enum ttu_flags flags)
.rmap_one = try_to_unmap_one,
.arg = (void *)flags,
.done = page_not_mapped,
- .file_nonlinear = try_to_unmap_nonlinear,
.anon_lock = page_lock_anon_vma_read,
};
@@ -1612,12 +1404,6 @@ int try_to_munlock(struct page *page)
.rmap_one = try_to_unmap_one,
.arg = (void *)TTU_MUNLOCK,
.done = page_not_mapped,
- /*
- * We don't bother to try to find the munlocked page in
- * nonlinears. It's costly. Instead, later, page reclaim logic
- * may call try_to_unmap() and recover PG_mlocked lazily.
- */
- .file_nonlinear = NULL,
.anon_lock = page_lock_anon_vma_read,
};
@@ -1748,13 +1534,6 @@ static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc)
goto done;
}
- if (!rwc->file_nonlinear)
- goto done;
-
- if (list_empty(&mapping->i_mmap_nonlinear))
- goto done;
-
- ret = rwc->file_nonlinear(page, mapping, rwc->arg);
done:
i_mmap_unlock_read(mapping);
return ret;
diff --git a/mm/shmem.c b/mm/shmem.c
index 993e6ba689cc..b3e403181981 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3201,7 +3201,6 @@ static const struct vm_operations_struct shmem_vm_ops = {
.set_policy = shmem_set_policy,
.get_policy = shmem_get_policy,
#endif
- .remap_pages = generic_file_remap_pages,
};
static struct dentry *shmem_mount(struct file_system_type *fs_type,
diff --git a/mm/slab.h b/mm/slab.h
index 1cf4005482dd..90430d6f665e 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -235,7 +235,7 @@ static __always_inline int memcg_charge_slab(struct kmem_cache *s,
return 0;
if (is_root_cache(s))
return 0;
- return __memcg_charge_slab(s, gfp, order);
+ return memcg_charge_kmem(s->memcg_params->memcg, gfp, 1 << order);
}
static __always_inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
@@ -244,7 +244,7 @@ static __always_inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
return;
if (is_root_cache(s))
return;
- __memcg_uncharge_slab(s, order);
+ memcg_uncharge_kmem(s->memcg_params->memcg, 1 << order);
}
#else
static inline bool is_root_cache(struct kmem_cache *s)
diff --git a/mm/slab_common.c b/mm/slab_common.c
index e03dd6f2a272..6e1e4cf65836 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -331,7 +331,7 @@ out:
out_free_cache:
memcg_free_cache_params(s);
- kfree(s);
+ kmem_cache_free(kmem_cache, s);
goto out;
}
@@ -425,21 +425,64 @@ out_unlock:
}
EXPORT_SYMBOL(kmem_cache_create);
+static int do_kmem_cache_shutdown(struct kmem_cache *s,
+ struct list_head *release, bool *need_rcu_barrier)
+{
+ if (__kmem_cache_shutdown(s) != 0) {
+ printk(KERN_ERR "kmem_cache_destroy %s: "
+ "Slab cache still has objects\n", s->name);
+ dump_stack();
+ return -EBUSY;
+ }
+
+ if (s->flags & SLAB_DESTROY_BY_RCU)
+ *need_rcu_barrier = true;
+
+#ifdef CONFIG_MEMCG_KMEM
+ if (!is_root_cache(s)) {
+ struct kmem_cache *root_cache = s->memcg_params->root_cache;
+ int memcg_id = memcg_cache_id(s->memcg_params->memcg);
+
+ BUG_ON(root_cache->memcg_params->memcg_caches[memcg_id] != s);
+ root_cache->memcg_params->memcg_caches[memcg_id] = NULL;
+ }
+#endif
+ list_move(&s->list, release);
+ return 0;
+}
+
+static void do_kmem_cache_release(struct list_head *release,
+ bool need_rcu_barrier)
+{
+ struct kmem_cache *s, *s2;
+
+ if (need_rcu_barrier)
+ rcu_barrier();
+
+ list_for_each_entry_safe(s, s2, release, list) {
+#ifdef SLAB_SUPPORTS_SYSFS
+ sysfs_slab_remove(s);
+#else
+ slab_kmem_cache_release(s);
+#endif
+ }
+}
+
#ifdef CONFIG_MEMCG_KMEM
/*
* memcg_create_kmem_cache - Create a cache for a memory cgroup.
* @memcg: The memory cgroup the new cache is for.
* @root_cache: The parent of the new cache.
- * @memcg_name: The name of the memory cgroup (used for naming the new cache).
*
* This function attempts to create a kmem cache that will serve allocation
* requests going from @memcg to @root_cache. The new cache inherits properties
* from its parent.
*/
-struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
- struct kmem_cache *root_cache,
- const char *memcg_name)
+void memcg_create_kmem_cache(struct mem_cgroup *memcg,
+ struct kmem_cache *root_cache)
{
+ static char memcg_name_buf[NAME_MAX + 1]; /* protected by slab_mutex */
+ int memcg_id = memcg_cache_id(memcg);
struct kmem_cache *s = NULL;
char *cache_name;
@@ -448,8 +491,18 @@ struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
mutex_lock(&slab_mutex);
+ /*
+ * Since per-memcg caches are created asynchronously on first
+ * allocation (see memcg_kmem_get_cache()), several threads can try to
+ * create the same cache, but only one of them may succeed.
+ */
+ if (cache_from_memcg_idx(root_cache, memcg_id))
+ goto out_unlock;
+
+ cgroup_name(mem_cgroup_css(memcg)->cgroup,
+ memcg_name_buf, sizeof(memcg_name_buf));
cache_name = kasprintf(GFP_KERNEL, "%s(%d:%s)", root_cache->name,
- memcg_cache_id(memcg), memcg_name);
+ memcg_cache_id(memcg), memcg_name_buf);
if (!cache_name)
goto out_unlock;
@@ -457,49 +510,73 @@ struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
root_cache->size, root_cache->align,
root_cache->flags, root_cache->ctor,
memcg, root_cache);
+ /*
+ * If we could not create a memcg cache, do not complain, because
+ * that's not critical at all as we can always proceed with the root
+ * cache.
+ */
if (IS_ERR(s)) {
kfree(cache_name);
- s = NULL;
+ goto out_unlock;
}
+ /*
+ * Since readers won't lock (see cache_from_memcg_idx()), we need a
+ * barrier here to ensure nobody will see the kmem_cache partially
+ * initialized.
+ */
+ smp_wmb();
+ root_cache->memcg_params->memcg_caches[memcg_id] = s;
+
out_unlock:
mutex_unlock(&slab_mutex);
put_online_mems();
put_online_cpus();
-
- return s;
}
-static int memcg_cleanup_cache_params(struct kmem_cache *s)
+void memcg_destroy_kmem_caches(struct mem_cgroup *memcg)
{
- int rc;
+ LIST_HEAD(release);
+ bool need_rcu_barrier = false;
+ struct kmem_cache *s, *s2;
- if (!s->memcg_params ||
- !s->memcg_params->is_root_cache)
- return 0;
+ get_online_cpus();
+ get_online_mems();
- mutex_unlock(&slab_mutex);
- rc = __memcg_cleanup_cache_params(s);
mutex_lock(&slab_mutex);
+ list_for_each_entry_safe(s, s2, &slab_caches, list) {
+ if (is_root_cache(s) || s->memcg_params->memcg != memcg)
+ continue;
+ /*
+ * The cgroup is about to be freed and therefore has no charges
+ * left. Hence, all its caches must be empty by now.
+ */
+ BUG_ON(do_kmem_cache_shutdown(s, &release, &need_rcu_barrier));
+ }
+ mutex_unlock(&slab_mutex);
- return rc;
-}
-#else
-static int memcg_cleanup_cache_params(struct kmem_cache *s)
-{
- return 0;
+ put_online_mems();
+ put_online_cpus();
+
+ do_kmem_cache_release(&release, need_rcu_barrier);
}
#endif /* CONFIG_MEMCG_KMEM */
void slab_kmem_cache_release(struct kmem_cache *s)
{
+ memcg_free_cache_params(s);
kfree(s->name);
kmem_cache_free(kmem_cache, s);
}
void kmem_cache_destroy(struct kmem_cache *s)
{
+ int i;
+ LIST_HEAD(release);
+ bool need_rcu_barrier = false;
+ bool busy = false;
+
get_online_cpus();
get_online_mems();
@@ -509,35 +586,23 @@ void kmem_cache_destroy(struct kmem_cache *s)
if (s->refcount)
goto out_unlock;
- if (memcg_cleanup_cache_params(s) != 0)
- goto out_unlock;
+ for_each_memcg_cache_index(i) {
+ struct kmem_cache *c = cache_from_memcg_idx(s, i);
- if (__kmem_cache_shutdown(s) != 0) {
- printk(KERN_ERR "kmem_cache_destroy %s: "
- "Slab cache still has objects\n", s->name);
- dump_stack();
- goto out_unlock;
+ if (c && do_kmem_cache_shutdown(c, &release, &need_rcu_barrier))
+ busy = true;
}
- list_del(&s->list);
-
- mutex_unlock(&slab_mutex);
- if (s->flags & SLAB_DESTROY_BY_RCU)
- rcu_barrier();
-
- memcg_free_cache_params(s);
-#ifdef SLAB_SUPPORTS_SYSFS
- sysfs_slab_remove(s);
-#else
- slab_kmem_cache_release(s);
-#endif
- goto out;
+ if (!busy)
+ do_kmem_cache_shutdown(s, &release, &need_rcu_barrier);
out_unlock:
mutex_unlock(&slab_mutex);
-out:
+
put_online_mems();
put_online_cpus();
+
+ do_kmem_cache_release(&release, need_rcu_barrier);
}
EXPORT_SYMBOL(kmem_cache_destroy);
diff --git a/mm/slub.c b/mm/slub.c
index fe376fe1f4fe..8b8508adf9c2 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2398,13 +2398,24 @@ redo:
* reading from one cpu area. That does not matter as long
* as we end up on the original cpu again when doing the cmpxchg.
*
- * Preemption is disabled for the retrieval of the tid because that
- * must occur from the current processor. We cannot allow rescheduling
- * on a different processor between the determination of the pointer
- * and the retrieval of the tid.
+ * We should guarantee that tid and kmem_cache are retrieved on
+ * the same cpu. It could be different if CONFIG_PREEMPT so we need
+ * to check if it is matched or not.
*/
- preempt_disable();
- c = this_cpu_ptr(s->cpu_slab);
+ do {
+ tid = this_cpu_read(s->cpu_slab->tid);
+ c = raw_cpu_ptr(s->cpu_slab);
+ } while (IS_ENABLED(CONFIG_PREEMPT) && unlikely(tid != c->tid));
+
+ /*
+ * Irqless object alloc/free algorithm used here depends on sequence
+ * of fetching cpu_slab's data. tid should be fetched before anything
+ * on c to guarantee that object and page associated with previous tid
+ * won't be used with current tid. If we fetch tid first, object and
+ * page could be one associated with next tid and our alloc/free
+ * request will be failed. In this case, we will retry. So, no problem.
+ */
+ barrier();
/*
* The transaction ids are globally unique per cpu and per operation on
@@ -2412,8 +2423,6 @@ redo:
* occurs on the right processor and that there was no operation on the
* linked list in between.
*/
- tid = c->tid;
- preempt_enable();
object = c->freelist;
page = c->page;
@@ -2512,7 +2521,7 @@ EXPORT_SYMBOL(kmem_cache_alloc_node_trace);
#endif
/*
- * Slow patch handling. This may still be called frequently since objects
+ * Slow path handling. This may still be called frequently since objects
* have a longer lifetime than the cpu slabs in most processing loads.
*
* So we still attempt to reduce cache line usage. Just take the slab
@@ -2659,11 +2668,13 @@ redo:
* data is retrieved via this pointer. If we are on the same cpu
* during the cmpxchg then the free will succedd.
*/
- preempt_disable();
- c = this_cpu_ptr(s->cpu_slab);
+ do {
+ tid = this_cpu_read(s->cpu_slab->tid);
+ c = raw_cpu_ptr(s->cpu_slab);
+ } while (IS_ENABLED(CONFIG_PREEMPT) && unlikely(tid != c->tid));
- tid = c->tid;
- preempt_enable();
+ /* Same with comment on barrier() in slab_alloc_node() */
+ barrier();
if (likely(page == c->page)) {
set_freepointer(s, object, c->freelist);
diff --git a/mm/swap.c b/mm/swap.c
index 8a12b33936b4..5b3087228b99 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -1140,10 +1140,8 @@ void __init swap_setup(void)
if (bdi_init(swapper_spaces[0].backing_dev_info))
panic("Failed to init swap bdi");
- for (i = 0; i < MAX_SWAPFILES; i++) {
+ for (i = 0; i < MAX_SWAPFILES; i++)
spin_lock_init(&swapper_spaces[i].tree_lock);
- INIT_LIST_HEAD(&swapper_spaces[i].i_mmap_nonlinear);
- }
#endif
/* Use a smaller cluster for small-memory machines */
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 1284f89fca08..9943e5fd74e6 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -17,6 +17,9 @@
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/vmstat.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
#include <linux/sched.h>
#include <linux/math64.h>
#include <linux/writeback.h>
@@ -670,66 +673,6 @@ int fragmentation_index(struct zone *zone, unsigned int order)
}
#endif
-#if defined(CONFIG_PROC_FS) || defined(CONFIG_COMPACTION)
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-
-static char * const migratetype_names[MIGRATE_TYPES] = {
- "Unmovable",
- "Reclaimable",
- "Movable",
- "Reserve",
-#ifdef CONFIG_CMA
- "CMA",
-#endif
-#ifdef CONFIG_MEMORY_ISOLATION
- "Isolate",
-#endif
-};
-
-static void *frag_start(struct seq_file *m, loff_t *pos)
-{
- pg_data_t *pgdat;
- loff_t node = *pos;
- for (pgdat = first_online_pgdat();
- pgdat && node;
- pgdat = next_online_pgdat(pgdat))
- --node;
-
- return pgdat;
-}
-
-static void *frag_next(struct seq_file *m, void *arg, loff_t *pos)
-{
- pg_data_t *pgdat = (pg_data_t *)arg;
-
- (*pos)++;
- return next_online_pgdat(pgdat);
-}
-
-static void frag_stop(struct seq_file *m, void *arg)
-{
-}
-
-/* Walk all the zones in a node and print using a callback */
-static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat,
- void (*print)(struct seq_file *m, pg_data_t *, struct zone *))
-{
- struct zone *zone;
- struct zone *node_zones = pgdat->node_zones;
- unsigned long flags;
-
- for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
- if (!populated_zone(zone))
- continue;
-
- spin_lock_irqsave(&zone->lock, flags);
- print(m, pgdat, zone);
- spin_unlock_irqrestore(&zone->lock, flags);
- }
-}
-#endif
-
#if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS) || defined(CONFIG_NUMA)
#ifdef CONFIG_ZONE_DMA
#define TEXT_FOR_DMA(xx) xx "_dma",
@@ -907,7 +850,66 @@ const char * const vmstat_text[] = {
#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA */
+#if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_COMPACTION)) || \
+ defined(CONFIG_PROC_FS)
+static void *frag_start(struct seq_file *m, loff_t *pos)
+{
+ pg_data_t *pgdat;
+ loff_t node = *pos;
+
+ for (pgdat = first_online_pgdat();
+ pgdat && node;
+ pgdat = next_online_pgdat(pgdat))
+ --node;
+
+ return pgdat;
+}
+
+static void *frag_next(struct seq_file *m, void *arg, loff_t *pos)
+{
+ pg_data_t *pgdat = (pg_data_t *)arg;
+
+ (*pos)++;
+ return next_online_pgdat(pgdat);
+}
+
+static void frag_stop(struct seq_file *m, void *arg)
+{
+}
+
+/* Walk all the zones in a node and print using a callback */
+static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat,
+ void (*print)(struct seq_file *m, pg_data_t *, struct zone *))
+{
+ struct zone *zone;
+ struct zone *node_zones = pgdat->node_zones;
+ unsigned long flags;
+
+ for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
+ if (!populated_zone(zone))
+ continue;
+
+ spin_lock_irqsave(&zone->lock, flags);
+ print(m, pgdat, zone);
+ spin_unlock_irqrestore(&zone->lock, flags);
+ }
+}
+#endif
+
#ifdef CONFIG_PROC_FS
+static char * const migratetype_names[MIGRATE_TYPES] = {
+ "Unmovable",
+ "Reclaimable",
+ "Movable",
+ "Reserve",
+#ifdef CONFIG_CMA
+ "CMA",
+#endif
+#ifdef CONFIG_MEMORY_ISOLATION
+ "Isolate",
+#endif
+};
+
static void frag_show_print(struct seq_file *m, pg_data_t *pgdat,
struct zone *zone)
{
@@ -1536,8 +1538,6 @@ static int __init setup_vmstat(void)
module_init(setup_vmstat)
#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_COMPACTION)
-#include <linux/debugfs.h>
-
/*
* Return an index indicating how much of the available free memory is
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 21:19:43 +0000