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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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kernel/res_counter.c
+4
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@@ -28,6 +28,8 @@ int res_counter_charge_locked(struct res_counter *counter, unsigned long val)
}
counter->usage += val;
if (counter->usage > counter->max_usage)
counter->max_usage = counter->usage;
return 0;
}
@@ -66,6 +68,8 @@ res_counter_member(struct res_counter *counter, int member)
switch (member) {
case RES_USAGE:
return &counter->usage;
case RES_MAX_USAGE:
return &counter->max_usage;
case RES_LIMIT:
return &counter->limit;
case RES_FAILCNT: