memcgroup: add the max_usage member on the res_counter
This field is the maximal value of the usage one since the counter creation
(or since the latest reset).
To reset this to the usage value simply write anything to the appropriate
cgroup file.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Balbir Singh <balbir@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>
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 49d8081..350a14d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -855,6 +855,17 @@
mem_cgroup_write_strategy);
}
+static ssize_t mem_cgroup_max_reset(struct cgroup *cont, struct cftype *cft,
+ struct file *file, const char __user *userbuf,
+ size_t nbytes, loff_t *ppos)
+{
+ struct mem_cgroup *mem;
+
+ mem = mem_cgroup_from_cont(cont);
+ res_counter_reset_max(&mem->res);
+ return nbytes;
+}
+
static ssize_t mem_force_empty_write(struct cgroup *cont,
struct cftype *cft, struct file *file,
const char __user *userbuf,
@@ -910,6 +921,12 @@
.read_u64 = mem_cgroup_read,
},
{
+ .name = "max_usage_in_bytes",
+ .private = RES_MAX_USAGE,
+ .write = mem_cgroup_max_reset,
+ .read_u64 = mem_cgroup_read,
+ },
+ {
.name = "limit_in_bytes",
.private = RES_LIMIT,
.write = mem_cgroup_write,