The patch titled
shm_locked-pages-are-unevictable: revert shm change of shm_locked pages are unevictable patch
has been added to the -mm tree. Its filename is
shm_locked-pages-are-unevictable-revert-shm-change-of-shm_locked-pages-are-unevictable-patch.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: shm_locked-pages-are-unevictable: revert shm change of shm_locked pages are unevictable patch
From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
shm_locked-pages-are-unevictable.patch changed several shmem code because
that putback_lru_page() had needed page lock.
It has little performance degression and isn't necessary now. So,
reverting is better.
Fixup to handle changes to putback_lru_page() change. Add retry to loop
check_move_unevictable_page().
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 9 ++++-----
ipc/shm.c | 16 ++--------------
mm/shmem.c | 10 +++++-----
mm/vmscan.c | 19 +++++--------------
4 files changed, 16 insertions(+), 38 deletions(-)
diff -puN include/linux/mm.h~shm_locked-pages-are-unevictable-revert-shm-change-of-shm_locked-pages-are-unevictable-patch include/linux/mm.h
--- a/include/linux/mm.h~shm_locked-pages-are-unevictable-revert-shm-change-of-shm_locked-pages-are-unevictable-patch
+++ a/include/linux/mm.h
@@ -705,13 +705,12 @@ static inline int page_mapped(struct pag
extern void show_free_areas(void);
#ifdef CONFIG_SHMEM
-extern struct address_space *shmem_lock(struct file *file, int lock,
- struct user_struct *user);
+extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
#else
-static inline struct address_space *shmem_lock(struct file *file, int lock,
- struct user_struct *user)
+static inline int shmem_lock(struct file *file, int lock,
+ struct user_struct *user)
{
- return NULL;
+ return 0;
}
#endif
struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags);
diff -puN ipc/shm.c~shm_locked-pages-are-unevictable-revert-shm-change-of-shm_locked-pages-are-unevictable-patch ipc/shm.c
--- a/ipc/shm.c~shm_locked-pages-are-unevictable-revert-shm-change-of-shm_locked-pages-are-unevictable-patch
+++ a/ipc/shm.c
@@ -737,7 +737,6 @@ asmlinkage long sys_shmctl(int shmid, in
case SHM_LOCK:
case SHM_UNLOCK:
{
- struct address_space *mapping = NULL;
struct file *uninitialized_var(shm_file);
lru_add_drain_all(); /* drain pagevecs to lru lists */
@@ -769,29 +768,18 @@ asmlinkage long sys_shmctl(int shmid, in
if(cmd==SHM_LOCK) {
struct user_struct * user = current->user;
if (!is_file_hugepages(shp->shm_file)) {
- mapping = shmem_lock(shp->shm_file, 1, user);
- if (IS_ERR(mapping))
- err = PTR_ERR(mapping);
- mapping = NULL;
+ err = shmem_lock(shp->shm_file, 1, user);
if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){
shp->shm_perm.mode |= SHM_LOCKED;
shp->mlock_user = user;
}
}
} else if (!is_file_hugepages(shp->shm_file)) {
- mapping = shmem_lock(shp->shm_file, 0, shp->mlock_user);
+ shmem_lock(shp->shm_file, 0, shp->mlock_user);
shp->shm_perm.mode &= ~SHM_LOCKED;
shp->mlock_user = NULL;
- if (mapping) {
- shm_file = shp->shm_file;
- get_file(shm_file); /* hold across unlock */
- }
}
shm_unlock(shp);
- if (mapping) {
- scan_mapping_unevictable_pages(mapping);
- fput(shm_file);
- }
goto out;
}
case IPC_RMID:
diff -puN mm/shmem.c~shm_locked-pages-are-unevictable-revert-shm-change-of-shm_locked-pages-are-unevictable-patch mm/shmem.c
--- a/mm/shmem.c~shm_locked-pages-are-unevictable-revert-shm-change-of-shm_locked-pages-are-unevictable-patch
+++ a/mm/shmem.c
@@ -1468,12 +1468,11 @@ static struct mempolicy *shmem_get_polic
}
#endif
-struct address_space *shmem_lock(struct file *file, int lock,
- struct user_struct *user)
+int shmem_lock(struct file *file, int lock, struct user_struct *user)
{
struct inode *inode = file->f_path.dentry->d_inode;
struct shmem_inode_info *info = SHMEM_I(inode);
- struct address_space *retval = ERR_PTR(-ENOMEM);
+ int retval = -ENOMEM;
spin_lock(&info->lock);
if (lock && !(info->flags & VM_LOCKED)) {
@@ -1481,14 +1480,15 @@ struct address_space *shmem_lock(struct
goto out_nomem;
info->flags |= VM_LOCKED;
mapping_set_unevictable(file->f_mapping);
- retval = NULL;
}
if (!lock && (info->flags & VM_LOCKED) && user) {
user_shm_unlock(inode->i_size, user);
info->flags &= ~VM_LOCKED;
mapping_clear_unevictable(file->f_mapping);
- retval = file->f_mapping;
+ scan_mapping_unevictable_pages(file->f_mapping);
}
+ retval = 0;
+
out_nomem:
spin_unlock(&info->lock);
return retval;
diff -puN mm/vmscan.c~shm_locked-pages-are-unevictable-revert-shm-change-of-shm_locked-pages-are-unevictable-patch mm/vmscan.c
--- a/mm/vmscan.c~shm_locked-pages-are-unevictable-revert-shm-change-of-shm_locked-pages-are-unevictable-patch
+++ a/mm/vmscan.c
@@ -2391,8 +2391,10 @@ int page_evictable(struct page *page, st
*/
static void check_move_unevictable_page(struct page *page, struct zone *zone)
{
+ VM_BUG_ON(PageActive(page));
- ClearPageUnevictable(page); /* for page_evictable() */
+retry:
+ ClearPageUnevictable(page);
if (page_evictable(page, NULL)) {
enum lru_list l = LRU_INACTIVE_ANON + page_is_file_cache(page);
__dec_zone_state(zone, NR_UNEVICTABLE);
@@ -2404,6 +2406,8 @@ static void check_move_unevictable_page(
*/
SetPageUnevictable(page);
list_move(&page->lru, &zone->lru[LRU_UNEVICTABLE].list);
+ if (page_evictable(page, NULL))
+ goto retry;
}
}
@@ -2441,16 +2445,6 @@ void scan_mapping_unevictable_pages(stru
next = page_index;
next++;
- if (TestSetPageLocked(page)) {
- /*
- * OK, let's do it the hard way...
- */
- if (zone)
- spin_unlock_irq(&zone->lru_lock);
- zone = NULL;
- lock_page(page);
- }
-
if (pagezone != zone) {
if (zone)
spin_unlock_irq(&zone->lru_lock);
@@ -2460,9 +2454,6 @@ void scan_mapping_unevictable_pages(stru
if (PageLRU(page) && PageUnevictable(page))
check_move_unevictable_page(page, zone);
-
- unlock_page(page);
-
}
if (zone)
spin_unlock_irq(&zone->lru_lock);
_
Patches currently in -mm which might be from kosaki.motohiro@xxxxxxxxxxxxxx are
page-allocator-inlnie-some-__alloc_pages-wrappers.patch
page-allocator-inlnie-some-__alloc_pages-wrappers-fix.patch
mm-hugetlbc-fix-duplicate-variable.patch
page-flags-record-page-flag-overlays-explicitly.patch
slub-record-page-flag-overlays-explicitly.patch
slob-record-page-flag-overlays-explicitly.patch
pm-schedule-sysrq-poweroff-on-boot-cpu-fix.patch
call_usermodehelper-increase-reliability.patch
cgroup-list_for_each-cleanup-v2.patch
cgroup-anotate-two-variables-with-__read_mostly.patch
memcg-remove-refcnt-from-page_cgroup-fix-memcg-fix-mem_cgroup_end_migration-race.patch
memcg-remove-refcnt-from-page_cgroup-memcg-fix-shmem_unuse_inode-charging.patch
memcg-handle-swap-cache-fix-shmem-page-migration-incorrectness-on-memcgroup.patch
memcg-clean-up-checking-of-the-disabled-flag.patch
memcg-clean-up-checking-of-the-disabled-flag-memcg-further-checking-of-disabled-flag.patch
per-task-delay-accounting-update-document-and-getdelaysc-for-memory-reclaim.patch
full-conversion-to-early_initcall-interface-remove-old-interface-fix-fix.patch
relay-add-buffer-only-channels-useful-for-early-logging-fix.patch
mm-speculative-page-references-fix-migration_entry_wait-for-speculative-page-cache.patch
vmscan-use-an-indexed-array-for-lru-variables.patch
swap-use-an-array-for-the-lru-pagevecs.patch
define-page_file_cache-function-fix-splitlru-shmem_getpage-setpageswapbacked-sooner.patch
vmscan-split-lru-lists-into-anon-file-sets-collect-lru-meminfo-statistics-from-correct-offset.patch
vmscan-split-lru-lists-into-anon-file-sets-prevent-incorrect-oom-under-split_lru.patch
vmscan-split-lru-lists-into-anon-file-sets-split_lru-fix-pagevec_move_tail-doesnt-treat-unevictable-page.patch
vmscan-split-lru-lists-into-anon-file-sets-splitlru-memcg-swapbacked-pages-active.patch
vmscan-split-lru-lists-into-anon-file-sets-splitlru-bdi_cap_swap_backed.patch
vmscan-second-chance-replacement-for-anonymous-pages.patch
unevictable-lru-infrastructure.patch
unevictable-lru-infrastructure-fix.patch
unevictable-lru-infrastructure-remove-redundant-page-mapping-check.patch
unevictable-lru-infrastructure-putback_lru_page-unevictable-page-handling-rework.patch
unevictable-lru-infrastructure-kill-unnecessary-lock_page-in-vmscanc.patch
unevictable-lru-infrastructure-revert-migration-change-of-unevictable-lru-infrastructure.patch
unevictable-lru-page-statistics.patch
unevictable-lru-page-statistics-fix-printk-in-show_free_areas.patch
unevictable-lru-page-statistics-units-fix.patch
shm_locked-pages-are-unevictable.patch
shm_locked-pages-are-unevictable-revert-shm-change-of-shm_locked-pages-are-unevictable-patch.patch
mlock-mlocked-pages-are-unevictable.patch
mlock-mlocked-pages-are-unevictable-fix.patch
mlock-mlocked-pages-are-unevictable-fix-fix.patch
mlock-mlocked-pages-are-unevictable-fix-3.patch
mlock-mlocked-pages-are-unevictable-fix-fix-munlock-page-table-walk-now-requires-mm.patch
mlock-mlocked-pages-are-unevictable-restore-patch-failure-hunk-of-mlock-mlocked-pages-are-unevictablepatch.patch
mlock-mlocked-pages-are-unevictable-fix-truncate-race-and-sevaral-comments.patch
mmap-handle-mlocked-pages-during-map-remap-unmap.patch
fix-double-unlock_page-in-2626-rc5-mm3-kernel-bug-at-mm-filemapc-575.patch
mmap-handle-mlocked-pages-during-map-remap-unmap-cleanup.patch
vmstat-mlocked-pages-statistics.patch
vmstat-mlocked-pages-statistics-fix-incorrect-mlocked-field-of-proc-meminfo.patch
vmstat-mlocked-pages-statistics-fix.patch
swap-cull-unevictable-pages-in-fault-path-fix.patch
vmstat-unevictable-and-mlocked-pages-vm-events.patch
restore-patch-failure-of-vmstat-unevictable-and-mlocked-pages-vm-eventspatch.patch
vmscan-unevictable-lru-scan-sysctl.patch
vmscan-unevictable-lru-scan-sysctl-nommu-fix.patch
vmscam-kill-unused-lru-functions.patch
make-mm-memoryc-print_bad_pte-static.patch
mm-swapfilec-make-code-static.patch
make-mm-rmapc-anon_vma_cachep-static.patch
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