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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2012-05-30 00:07:03 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-30 01:22:27 +0200 |
| commit | 2bb2ba9d51a8044a71a29608d2c4ef8f5b2d57a2 (patch) | |
| tree | 5e58869c606c541d41a9bfa62aa6e8bc42cae5ac /mm/memory-failure.c | |
| parent | mm/vmscan: kill struct mem_cgroup_zone (diff) | |
| download | linux-2bb2ba9d51a8044a71a29608d2c4ef8f5b2d57a2.tar.xz linux-2bb2ba9d51a8044a71a29608d2c4ef8f5b2d57a2.zip | |
rescounters: add res_counter_uncharge_until()
When killing a res_counter which is a child of other counter, we need to
do
res_counter_uncharge(child, xxx)
res_counter_charge(parent, xxx)
This is not atomic and wastes CPU. This patch adds
res_counter_uncharge_until(). This function's uncharge propagates to
ancestors until specified res_counter.
res_counter_uncharge_until(child, parent, xxx)
Now the operation is atomic and efficient.
Signed-off-by: Frederic Weisbecker <fweisbec@redhat.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ying Han <yinghan@google.com>
Cc: Glauber Costa <glommer@parallels.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory-failure.c')
0 files changed, 0 insertions, 0 deletions