diff options
author | Frederic Weisbecker <fweisbec@gmail.com> | 2012-05-29 18:07:03 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-29 19:22:27 -0400 |
commit | 2bb2ba9d51a8044a71a29608d2c4ef8f5b2d57a2 (patch) | |
tree | 5e58869c606c541d41a9bfa62aa6e8bc42cae5ac /Documentation | |
parent | f9be23d6da035241b7687b25e64401171986dcef (diff) |
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 'Documentation')
-rw-r--r-- | Documentation/cgroups/resource_counter.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/cgroups/resource_counter.txt b/Documentation/cgroups/resource_counter.txt index f3c4ec3626a2..0c4a344e78fa 100644 --- a/Documentation/cgroups/resource_counter.txt +++ b/Documentation/cgroups/resource_counter.txt | |||
@@ -92,6 +92,14 @@ to work with it. | |||
92 | 92 | ||
93 | The _locked routines imply that the res_counter->lock is taken. | 93 | The _locked routines imply that the res_counter->lock is taken. |
94 | 94 | ||
95 | f. void res_counter_uncharge_until | ||
96 | (struct res_counter *rc, struct res_counter *top, | ||
97 | unsinged long val) | ||
98 | |||
99 | Almost same as res_cunter_uncharge() but propagation of uncharge | ||
100 | stops when rc == top. This is useful when kill a res_coutner in | ||
101 | child cgroup. | ||
102 | |||
95 | 2.1 Other accounting routines | 103 | 2.1 Other accounting routines |
96 | 104 | ||
97 | There are more routines that may help you with common needs, like | 105 | There are more routines that may help you with common needs, like |