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authorRoman Gushchin <guro@fb.com>2017-08-02 17:55:29 +0100
committerTejun Heo <tj@kernel.org>2017-08-02 12:05:19 -0700
commit0679dee03c6d706d57145ea92c23d08fa10a1999 (patch)
treec820222fb59847005601bfbb087f6dfb693af5c4 /kernel/cgroup/cgroup.c
parentc705a00d77457b44ba3790fdf0627ecb8593a254 (diff)
cgroup: keep track of number of descent cgroups
Keep track of the number of online and dying descent cgroups. This data will be used later to add an ability to control cgroup hierarchy (limit the depth and the number of descent cgroups) and display hierarchy stats. Signed-off-by: Roman Gushchin <guro@fb.com> Suggested-by: Tejun Heo <tj@kernel.org> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: Waiman Long <longman@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: kernel-team@fb.com Cc: cgroups@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org
Diffstat (limited to 'kernel/cgroup/cgroup.c')
-rw-r--r--kernel/cgroup/cgroup.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 85f6a112344b..cfdbb1e780de 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -4408,9 +4408,15 @@ static void css_release_work_fn(struct work_struct *work)
if (ss->css_released)
ss->css_released(css);
} else {
+ struct cgroup *tcgrp;
+
/* cgroup release path */
trace_cgroup_release(cgrp);
+ for (tcgrp = cgroup_parent(cgrp); tcgrp;
+ tcgrp = cgroup_parent(tcgrp))
+ tcgrp->nr_dying_descendants--;
+
cgroup_idr_remove(&cgrp->root->cgroup_idr, cgrp->id);
cgrp->id = -1;
@@ -4609,9 +4615,13 @@ static struct cgroup *cgroup_create(struct cgroup *parent)
cgrp->root = root;
cgrp->level = level;
- for (tcgrp = cgrp; tcgrp; tcgrp = cgroup_parent(tcgrp))
+ for (tcgrp = cgrp; tcgrp; tcgrp = cgroup_parent(tcgrp)) {
cgrp->ancestor_ids[tcgrp->level] = tcgrp->id;
+ if (tcgrp != cgrp)
+ tcgrp->nr_descendants++;
+ }
+
if (notify_on_release(parent))
set_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
@@ -4817,7 +4827,7 @@ static void kill_css(struct cgroup_subsys_state *css)
static int cgroup_destroy_locked(struct cgroup *cgrp)
__releases(&cgroup_mutex) __acquires(&cgroup_mutex)
{
- struct cgroup *parent = cgroup_parent(cgrp);
+ struct cgroup *tcgrp, *parent = cgroup_parent(cgrp);
struct cgroup_subsys_state *css;
struct cgrp_cset_link *link;
int ssid;
@@ -4865,6 +4875,11 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
if (parent && cgroup_is_threaded(cgrp))
parent->nr_threaded_children--;
+ for (tcgrp = cgroup_parent(cgrp); tcgrp; tcgrp = cgroup_parent(tcgrp)) {
+ tcgrp->nr_descendants--;
+ tcgrp->nr_dying_descendants++;
+ }
+
cgroup1_check_for_release(cgroup_parent(cgrp));
/* put the base reference */