The patch titled
Subject: mm: memcontrol: micro-optimize mem_cgroup_update_page_stat()
has been added to the -mm tree. Its filename is
mm-memcontrol-micro-optimize-mem_cgroup_update_page_stat.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memcontrol-micro-optimize-mem_cgroup_update_page_stat.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memcontrol-micro-optimize-mem_cgroup_update_page_stat.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: memcontrol: micro-optimize mem_cgroup_update_page_stat()
Do not look up the page_cgroup when the memory controller is
runtime-disabled, but do assert that the locking protocol is followed
under DEBUG_VM regardless. Also remove the unused flags variable.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff -puN mm/memcontrol.c~mm-memcontrol-micro-optimize-mem_cgroup_update_page_stat mm/memcontrol.c
--- a/mm/memcontrol.c~mm-memcontrol-micro-optimize-mem_cgroup_update_page_stat
+++ a/mm/memcontrol.c
@@ -2177,13 +2177,14 @@ void mem_cgroup_update_page_stat(struct
enum mem_cgroup_stat_index idx, int val)
{
struct mem_cgroup *memcg;
- struct page_cgroup *pc = lookup_page_cgroup(page);
- unsigned long uninitialized_var(flags);
+ struct page_cgroup *pc;
+
+ VM_BUG_ON(!rcu_read_lock_held());
if (mem_cgroup_disabled())
return;
- VM_BUG_ON(!rcu_read_lock_held());
+ pc = lookup_page_cgroup(page);
memcg = pc->mem_cgroup;
if (unlikely(!memcg || !PageCgroupUsed(pc)))
return;
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
cgroup-kmemleak-add-kmemleak_free-for-cgroup-deallocations.patch
mm-memcontrol-lockless-page-counters.patch
mm-memcontrol-lockless-page-counters-fix.patch
mm-memcontrol-lockless-page-counters-fix-fix.patch
mm-memcontrol-lockless-page-counters-fix-2.patch
mm-hugetlb_cgroup-convert-to-lockless-page-counters.patch
kernel-res_counter-remove-the-unused-api.patch
kernel-res_counter-remove-the-unused-api-fix.patch
kernel-res_counter-remove-the-unused-api-fix-2.patch
mm-memcontrol-convert-reclaim-iterator-to-simple-css-refcounting.patch
mm-memcontrol-convert-reclaim-iterator-to-simple-css-refcounting-fix.patch
mm-memcontrol-take-a-css-reference-for-each-charged-page.patch
mm-memcontrol-remove-obsolete-kmemcg-pinning-tricks.patch
mm-memcontrol-continue-cache-reclaim-from-offlined-groups.patch
mm-memcontrol-remove-synchroneous-stock-draining-code.patch
mm-vmscan-count-only-dirty-pages-as-congested.patch
memcg-simplify-unreclaimable-groups-handling-in-soft-limit-reclaim.patch
mm-memcontrol-update-mem_cgroup_page_lruvec-documentation.patch
mm-memcontrol-clarify-migration-where-old-page-is-uncharged.patch
memcg-remove-activate_kmem_mutex.patch
mm-memcontrol-micro-optimize-mem_cgroup_update_page_stat.patch
mm-memcontrol-uncharge-pages-on-swapout.patch
mm-memcontrol-remove-unnecessary-pcg_memsw-memoryswap-charge-flag.patch
mm-memcontrol-remove-unnecessary-pcg_mem-memory-charge-flag.patch
mm-memcontrol-remove-unnecessary-pcg_used-pc-mem_cgroup-valid-flag.patch
debugging-keep-track-of-page-owners.patch
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