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authorBalbir Singh <balbir@linux.vnet.ibm.com>2009-01-07 18:08:07 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:06 -0800
commit18f59ea7de08db2449ba99185e8d8cc30e7acac5 (patch)
tree34aa342a7984c72f7c9fbae0dd95d2fe9e20bc25 /mm/memcontrol.c
parent6d61ef409d6ba168972f7c2f8c35baaade636a58 (diff)
memcg: memory cgroup hierarchy feature selector
Don't enable multiple hierarchy support by default. This patch introduces a features element that can be set to enable the nested depth hierarchy feature. This feature can only be enabled when the cgroup for which the feature this is enabled, has no children. Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Cc: Paul Menage <menage@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Pavel Emelianov <xemul@openvz.org> Cc: Dhaval Giani <dhaval@linux.vnet.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c61
1 files changed, 57 insertions, 4 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 20e1d90b336..886e2224c5f 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -149,6 +149,10 @@ struct mem_cgroup {
* reclaimed from. Protected by cgroup_lock()
*/
struct mem_cgroup *last_scanned_child;
+ /*
+ * Should the accounting and control be hierarchical, per subtree?
+ */
+ bool use_hierarchy;
int obsolete;
atomic_t refcnt;
@@ -1543,6 +1547,44 @@ int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event)
}
+static u64 mem_cgroup_hierarchy_read(struct cgroup *cont, struct cftype *cft)
+{
+ return mem_cgroup_from_cont(cont)->use_hierarchy;
+}
+
+static int mem_cgroup_hierarchy_write(struct cgroup *cont, struct cftype *cft,
+ u64 val)
+{
+ int retval = 0;
+ struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
+ struct cgroup *parent = cont->parent;
+ struct mem_cgroup *parent_mem = NULL;
+
+ if (parent)
+ parent_mem = mem_cgroup_from_cont(parent);
+
+ cgroup_lock();
+ /*
+ * If parent's use_hiearchy is set, we can't make any modifications
+ * in the child subtrees. If it is unset, then the change can
+ * occur, provided the current cgroup has no children.
+ *
+ * For the root cgroup, parent_mem is NULL, we allow value to be
+ * set if there are no children.
+ */
+ if ((!parent_mem || !parent_mem->use_hierarchy) &&
+ (val == 1 || val == 0)) {
+ if (list_empty(&cont->children))
+ mem->use_hierarchy = val;
+ else
+ retval = -EBUSY;
+ } else
+ retval = -EINVAL;
+ cgroup_unlock();
+
+ return retval;
+}
+
static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
{
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
@@ -1706,6 +1748,11 @@ static struct cftype mem_cgroup_files[] = {
.name = "force_empty",
.trigger = mem_cgroup_force_empty_write,
},
+ {
+ .name = "use_hierarchy",
+ .write_u64 = mem_cgroup_hierarchy_write,
+ .read_u64 = mem_cgroup_hierarchy_read,
+ },
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
@@ -1881,12 +1928,18 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
if (cont->parent == NULL) {
enable_swap_cgroup();
parent = NULL;
- } else
+ } else {
parent = mem_cgroup_from_cont(cont->parent);
+ mem->use_hierarchy = parent->use_hierarchy;
+ }
- res_counter_init(&mem->res, parent ? &parent->res : NULL);
- res_counter_init(&mem->memsw, parent ? &parent->memsw : NULL);
-
+ if (parent && parent->use_hierarchy) {
+ res_counter_init(&mem->res, &parent->res);
+ res_counter_init(&mem->memsw, &parent->memsw);
+ } else {
+ res_counter_init(&mem->res, NULL);
+ res_counter_init(&mem->memsw, NULL);
+ }
mem->last_scanned_child = NULL;