- memcg-handle-swap-cache.patch removed from -mm tree

- memcg-handle-swap-cache.patch removed from -mm tree

[akpm]

The patch titled
     memcg: handle swap cache
has been removed from the -mm tree.  Its filename was
     memcg-handle-swap-cache.patch

This patch was dropped because it was withdrawn

The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/

------------------------------------------------------
Subject: memcg: handle swap cache
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Now swapcache is not accounted. (because it had some troubles.)

This is retrying account swap cache, based on remove-refcnt patch.

 * If a page is swap-cache,  mem_cgroup_uncharge_page() will *not*
   uncharge a page even if page->mapcount == 0.
 * If a page is removed from swap-cache, mem_cgroup_uncharge_page()
   is called.
 * A new swapcache page is not charged until when it's mapped. By this
   we can avoid complicated read-ahead troubles.

 A file, memory.stat,"rss" member is changed to "anon/swapcache".
 (rss is not precise name here...)
 When all processes in cgroup exits, rss/swapcache counter can have some
 numbers because of lazy behavior of LRU. So the word "rss" is confusing.

 I can easily imagine a user says "Oh, there may be memory leak..."
 Precise counting of swapcache will be tried in future (if necessary)

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Cc: Paul Menage <menage@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memcontrol.c |    9 +++++----
 mm/migrate.c    |    3 ++-
 mm/swap_state.c |    1 +
 3 files changed, 8 insertions(+), 5 deletions(-)

diff -puN mm/memcontrol.c~memcg-handle-swap-cache mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-handle-swap-cache
+++ a/mm/memcontrol.c
@@ -44,10 +44,10 @@ static struct kmem_cache *page_cgroup_ca
  */
 enum mem_cgroup_stat_index {
 	/*
-	 * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
+	 * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss/swapcache.
 	 */
 	MEM_CGROUP_STAT_CACHE, 	   /* # of pages charged as cache */
-	MEM_CGROUP_STAT_RSS,	   /* # of pages charged as rss */
+	MEM_CGROUP_STAT_RSS,	   /* # of pages charged as anon/swapcache */
 	MEM_CGROUP_STAT_PGPGIN_COUNT,	/* # of pages paged in */
 	MEM_CGROUP_STAT_PGPGOUT_COUNT,	/* # of pages paged out */
 
@@ -697,7 +697,8 @@ __mem_cgroup_uncharge_common(struct page
 
 	if ((ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED)
 	    && ((pc->flags & PAGE_CGROUP_FLAG_CACHE)
-		|| page_mapped(page)))
+		|| page_mapped(page)
+		|| PageSwapCache(page)))
 		goto unlock;
 
 	mz = page_cgroup_zoneinfo(pc);
@@ -902,7 +903,7 @@ static const struct mem_cgroup_stat_desc
 	u64 unit;
 } mem_cgroup_stat_desc[] = {
 	[MEM_CGROUP_STAT_CACHE] = { "cache", PAGE_SIZE, },
-	[MEM_CGROUP_STAT_RSS] = { "rss", PAGE_SIZE, },
+	[MEM_CGROUP_STAT_RSS] = { "anon/swapcache", PAGE_SIZE, },
 	[MEM_CGROUP_STAT_PGPGIN_COUNT] = {"pgpgin", 1, },
 	[MEM_CGROUP_STAT_PGPGOUT_COUNT] = {"pgpgout", 1, },
 };
diff -puN mm/migrate.c~memcg-handle-swap-cache mm/migrate.c
--- a/mm/migrate.c~memcg-handle-swap-cache
+++ a/mm/migrate.c
@@ -360,7 +360,8 @@ static int migrate_page_move_mapping(str
 	write_unlock_irq(&mapping->tree_lock);
 	if (!PageSwapCache(newpage)) {
 		mem_cgroup_uncharge_cache_page(page);
-	}
+	} else
+		mem_cgroup_uncharge_page(page);
 
 	return 0;
 }
diff -puN mm/swap_state.c~memcg-handle-swap-cache mm/swap_state.c
--- a/mm/swap_state.c~memcg-handle-swap-cache
+++ a/mm/swap_state.c
@@ -110,6 +110,7 @@ void __delete_from_swap_cache(struct pag
 	total_swapcache_pages--;
 	__dec_zone_page_state(page, NR_FILE_PAGES);
 	INC_CACHE_INFO(del_total);
+	mem_cgroup_uncharge_page(page);
 }
 
 /**
_

Patches currently in -mm which might be from kamezawa.hiroyu@jp.fujitsu.com are

page-flags-record-page-flag-overlays-explicitly.patch
page-flags-record-page-flag-overlays-explicitly-xen.patch
memory-hotplugallocate-usemap-on-the-section-with-pgdat-take-4.patch
memory-hotplug-dont-calculate-vm_total_pages-twice-when-rebuilding-zonelists-in-online_pages.patch
memory-hotplug-add-sysfs-removable-attribute-for-hotplug-memory-remove.patch
mark-res_counter_charge_locked-with-__must_check.patch
cgroup-files-clean-up-whitespace-in-struct-cftype.patch
cgroup-files-add-write_string-cgroup-control-file-method.patch
cgroup-files-move-the-release_agent-file-to-use-typed-handlers.patch
cgroups-misc-cleanups-to-write_string-patchset.patch
cgroup-files-move-notify_on_release-file-to-separate-write-handler.patch
cgroup-files-turn-attach_task_by_pid-directly-into-a-cgroup-write-handler.patch
cgroup-files-remove-cpuset_common_file_write.patch
cgroup-files-convert-devcgroup_access_write-into-a-cgroup-write_string-handler.patch
cgroup-files-convert-res_counter_write-to-be-a-cgroups-write_string-handler.patch
cgroup_clone-use-pid-of-newly-created-task-for-new-cgroup.patch
cgroup_clone-use-pid-of-newly-created-task-for-new-cgroup-fix.patch
cgroup_clone-use-pid-of-newly-created-task-for-new-cgroup-checkpatch-fixes.patch
memcg-make-global-var-read_mostly.patch
memcg-avoid-unnecessary-initialization.patch
memcg-better-migration-handling.patch
memcg-remove-refcnt-from-page_cgroup.patch
memcg-remove-refcnt-from-page_cgroup-fix.patch
memcg-remove-refcnt-from-page_cgroup-fix-2.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.patch
memcg-handle-swap-cache-fix.patch
memcg-handle-swap-cache-fix-shmem-page-migration-incorrectness-on-memcgroup.patch
memcg-helper-function-for-relcaim-from-shmem.patch
memcg-helper-function-for-relcaim-from-shmem-memcg-shmem_getpage-release-page-sooner.patch
memcg-helper-function-for-relcaim-from-shmem-memcg-mem_cgroup_shrink_usage-css_put.patch
memcg-add-hints-for-branch.patch
memcg-remove-a-redundant-check.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
memrlimit-add-memrlimit-controller-documentation.patch
memrlimit-setup-the-memrlimit-controller.patch
memrlimit-setup-the-memrlimit-controller-memrlimit-correct-mremap-and-move_vma-accounting.patch
memrlimit-cgroup-mm-owner-callback-changes-to-add-task-info.patch
memrlimit-cgroup-mm-owner-callback-changes-to-add-task-info-memrlimit-fix-mmap_sem-deadlock.patch
memrlimit-cgroup-mm-owner-callback-changes-to-add-task-info-memrlimit-fix-sleep-inside-sleeplock-in-mm_update_next_owner.patch
memrlimit-add-memrlimit-controller-accounting-and-control.patch
memrlimit-add-memrlimit-controller-accounting-and-control-memrlimit-improve-fork-and-error-handling.patch
memrlimit-improve-error-handling.patch
memrlimit-improve-error-handling-update.patch
memrlimit-handle-attach_task-failure-add-can_attach-callback.patch
memrlimit-handle-attach_task-failure-add-can_attach-callback-update.patch
mm-speculative-page-references-fix-migration_entry_wait-for-speculative-page-cache.patch
define-page_file_cache-function-fix-splitlru-shmem_getpage-setpageswapbacked-sooner.patch
vmscan-split-lru-lists-into-anon-file-sets-splitlru-memcg-swapbacked-pages-active.patch
unevictable-lru-infrastructure-putback_lru_page-unevictable-page-handling-rework.patch
mlock-mlocked-pages-are-unevictable-fix-truncate-race-and-sevaral-comments.patch
fix-double-unlock_page-in-2626-rc5-mm3-kernel-bug-at-mm-filemapc-575.patch
restore-patch-failure-of-vmstat-unevictable-and-mlocked-pages-vm-eventspatch.patch