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authorTejun Heo <tj@kernel.org>2015-10-15 23:41:49 +0300
committerTejun Heo <tj@kernel.org>2015-10-15 23:41:49 +0300
commit0de0942db2b36dd91c088a7950398d2e87f23b23 (patch)
tree27641a8e1c0639ea209f8b171b0eb191afc7118d /include/linux/cgroup-defs.h
parentb309e5b743a999cdb34a3989d1800c608e656c2b (diff)
downloadlinux-0de0942db2b36dd91c088a7950398d2e87f23b23.tar.xz
cgroup: make cgroup->nr_populated count the number of populated css_sets
Currently, cgroup->nr_populated counts whether the cgroup has any css_sets linked to it and the number of children which has non-zero ->nr_populated. This works because a css_set's refcnt converges with the number of tasks linked to it and thus there's no css_set linked to a cgroup if it doesn't have any live tasks. To help tracking resource usage of zombie tasks, putting the ref of css_set will be separated from disassociating the task from the css_set which means that a cgroup may have css_sets linked to it even when it doesn't have any live tasks. This patch updates cgroup->nr_populated so that for the cgroup itself it counts the number of css_sets which have tasks associated with them so that empty css_sets don't skew the populated test. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/cgroup-defs.h')
-rw-r--r--include/linux/cgroup-defs.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index df589a097539..17444505c870 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -232,10 +232,10 @@ struct cgroup {
int id;
/*
- * If this cgroup contains any tasks, it contributes one to
- * populated_cnt. All children with non-zero popuplated_cnt of
- * their own contribute one. The count is zero iff there's no task
- * in this cgroup or its subtree.
+ * Each non-empty css_set associated with this cgroup contributes
+ * one to populated_cnt. All children with non-zero popuplated_cnt
+ * of their own contribute one. The count is zero iff there's no
+ * task in this cgroup or its subtree.
*/
int populated_cnt;