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memcgroup: add the max_usage member on the res_counter

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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>
This commit is contained in:
Pavel Emelyanov
2008-04-29 01:00:17 -07:00
committed by Linus Torvalds
parent cf475ad28a
commit c84872e168
3 changed files with 35 additions and 0 deletions
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17
mm/memcontrol.c
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@@ -855,6 +855,17 @@ static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
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,
@@ -909,6 +920,12 @@ static struct cftype mem_cgroup_files[] = {
.private = RES_USAGE,
.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,