The patch titled
Subject: mm: memcontrol: zap oom_info_lock
has been added to the -mm tree. Its filename is
mm-memcontrol-zap-oom_info_lock.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memcontrol-zap-oom_info_lock.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memcontrol-zap-oom_info_lock.patch
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------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: mm: memcontrol: zap oom_info_lock
mem_cgroup_print_oom_info is always called under oom_lock, so
oom_info_lock is redundant.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 4 ----
1 file changed, 4 deletions(-)
diff -puN mm/memcontrol.c~mm-memcontrol-zap-oom_info_lock mm/memcontrol.c
--- a/mm/memcontrol.c~mm-memcontrol-zap-oom_info_lock
+++ a/mm/memcontrol.c
@@ -1150,12 +1150,9 @@ static bool mem_cgroup_wait_acct_move(st
*/
void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
{
- /* oom_info_lock ensures that parallel ooms do not interleave */
- static DEFINE_MUTEX(oom_info_lock);
struct mem_cgroup *iter;
unsigned int i;
- mutex_lock(&oom_info_lock);
rcu_read_lock();
if (p) {
@@ -1199,7 +1196,6 @@ void mem_cgroup_print_oom_info(struct me
pr_cont("\n");
}
- mutex_unlock(&oom_info_lock);
}
/*
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
mm-vmscan-do-not-clear-shrinker_numa_aware-if-nr_node_ids-==-1.patch
mm-migrate-do-not-touch-page-mem_cgroup-of-live-pages-fix-2.patch
mm-oom_reaper-implement-oom-victims-queuing-fix.patch
mm-memcontrol-do-not-bypass-slab-charge-if-memcg-is-offline.patch
mm-memcontrol-make-tree_statevents-fetch-all-stats.patch
mm-memcontrol-make-tree_statevents-fetch-all-stats-fix.patch
mm-memcontrol-report-slab-usage-in-cgroup2-memorystat.patch
mm-memcontrol-report-kernel-stack-usage-in-cgroup2-memorystat.patch
mm-memcontrol-report-kernel-stack-usage-in-cgroup2-memorystat-v2.patch
proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages-fix.patch
tools-vm-page-typesc-add-memory-cgroup-dumping-and-filtering-fix.patch
mm-memcontrol-enable-kmem-accounting-for-all-cgroups-in-the-legacy-hierarchy.patch
mm-vmscan-pass-root_mem_cgroup-instead-of-null-to-memcg-aware-shrinker.patch
mm-memcontrol-zap-memcg_kmem_online-helper.patch
radix-tree-account-radix_tree_node-to-memory-cgroup.patch
mm-workingset-size-shadow-nodes-lru-basing-on-file-cache-size.patch
mm-workingset-make-shadow-node-shrinker-memcg-aware.patch
mm-memcontrol-cleanup-css_reset-callback.patch
mm-memcontrol-zap-oom_info_lock.patch
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