The patch titled
Subject: memcg: fix dirty page migration
has been added to the -mm tree. Its filename is
memcg-fix-dirty-page-migration.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/memcg-fix-dirty-page-migration.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/memcg-fix-dirty-page-migration.patch
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------------------------------------------------------
From: Greg Thelen <gthelen@xxxxxxxxxx>
Subject: memcg: fix dirty page migration
The problem starts with a file backed dirty page which is charged to a
memcg. Then page migration is used to move oldpage to newpage.
Migration:
- copies the oldpage's data to newpage
- clears oldpage.PG_dirty
- sets newpage.PG_dirty
- uncharges oldpage from memcg
- charges newpage to memcg
Clearing oldpage.PG_dirty decrements the charged memcg's dirty page count.
However, because newpage is not yet charged, setting newpage.PG_dirty
does not increment the memcg's dirty page count. After migration
completes newpage.PG_dirty is eventually cleared, often in
account_page_cleaned(). At this time newpage is charged to a memcg so the
memcg's dirty page count is decremented which causes underflow because the
count was not previously incremented by migration. This underflow causes
balance_dirty_pages() to see a very large unsigned number of dirty memcg
pages which leads to aggressive throttling of buffered writes by processes
in non root memcg.
This issue:
- can harm performance of non root memcg buffered writes.
- can report too small (even negative) values in
memory.stat[(total_)dirty] counters of all memcg, including the root.
To avoid polluting migrate.c with #ifdef CONFIG_MEMCG checks, introduce
page_memcg() and set_page_memcg() helpers.
Test:
0) setup and enter limited memcg
mkdir /sys/fs/cgroup/test
echo 1G > /sys/fs/cgroup/test/memory.limit_in_bytes
echo $$ > /sys/fs/cgroup/test/cgroup.procs
1) buffered writes baseline
dd if=/dev/zero of=/data/tmp/foo bs=1M count=1k
sync
grep ^dirty /sys/fs/cgroup/test/memory.stat
2) buffered writes with compaction antagonist to induce migration
yes 1 > /proc/sys/vm/compact_memory &
rm -rf /data/tmp/foo
dd if=/dev/zero of=/data/tmp/foo bs=1M count=1k
kill %
sync
grep ^dirty /sys/fs/cgroup/test/memory.stat
3) buffered writes without antagonist, should match baseline
rm -rf /data/tmp/foo
dd if=/dev/zero of=/data/tmp/foo bs=1M count=1k
sync
grep ^dirty /sys/fs/cgroup/test/memory.stat
(speed, dirty residue)
unpatched patched
1) 841 MB/s 0 dirty pages 886 MB/s 0 dirty pages
2) 611 MB/s -33427456 dirty pages 793 MB/s 0 dirty pages
3) 114 MB/s -33427456 dirty pages 891 MB/s 0 dirty pages
Notice that unpatched baseline performance (1) fell after
migration (3): 841 -> 114 MB/s. In the patched kernel, post
migration performance matches baseline.
Fixes: c4843a7593a9 ("memcg: add per cgroup dirty page accounting")
Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx>
Reported-by: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [4.2+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 21 +++++++++++++++++++++
mm/migrate.c | 12 +++++++++++-
2 files changed, 32 insertions(+), 1 deletion(-)
diff -puN include/linux/mm.h~memcg-fix-dirty-page-migration include/linux/mm.h
--- a/include/linux/mm.h~memcg-fix-dirty-page-migration
+++ a/include/linux/mm.h
@@ -905,6 +905,27 @@ static inline void set_page_links(struct
#endif
}
+#ifdef CONFIG_MEMCG
+static inline struct mem_cgroup *page_memcg(struct page *page)
+{
+ return page->mem_cgroup;
+}
+
+static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg)
+{
+ page->mem_cgroup = memcg;
+}
+#else
+static inline struct mem_cgroup *page_memcg(struct page *page)
+{
+ return NULL;
+}
+
+static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg)
+{
+}
+#endif
+
/*
* Some inline functions in vmstat.h depend on page_zone()
*/
diff -puN mm/migrate.c~memcg-fix-dirty-page-migration mm/migrate.c
--- a/mm/migrate.c~memcg-fix-dirty-page-migration
+++ a/mm/migrate.c
@@ -740,6 +740,15 @@ static int move_to_new_page(struct page
if (PageSwapBacked(page))
SetPageSwapBacked(newpage);
+ /*
+ * Indirectly called below, migrate_page_copy() copies PG_dirty and thus
+ * needs newpage's memcg set to transfer memcg dirty page accounting.
+ * So perform memcg migration in two steps:
+ * 1. set newpage->mem_cgroup (here)
+ * 2. clear page->mem_cgroup (below)
+ */
+ set_page_memcg(newpage, page_memcg(page));
+
mapping = page_mapping(page);
if (!mapping)
rc = migrate_page(mapping, newpage, page, mode);
@@ -756,9 +765,10 @@ static int move_to_new_page(struct page
rc = fallback_migrate_page(mapping, newpage, page, mode);
if (rc != MIGRATEPAGE_SUCCESS) {
+ set_page_memcg(newpage, NULL);
newpage->mapping = NULL;
} else {
- mem_cgroup_migrate(page, newpage, false);
+ set_page_memcg(page, NULL);
if (page_was_mapped)
remove_migration_ptes(page, newpage);
page->mapping = NULL;
_
Patches currently in -mm which might be from gthelen@xxxxxxxxxx are
memcg-fix-dirty-page-migration.patch
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