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memcgroup: implement failcounter reset 

This is a very common requirement from people using the resource accounting
facilities (not only memcgroup but also OpenVZ beancounters).  They want to
put the cgroup in an initial state without re-creating it.

For example after re-configuring a group people want to observe how this new
configuration fits the group needs without saving the previous failcnt value.

Merge two resets into one mem_cgroup_reset() function to demonstrate how
multiplexing work.

Besides, I have plans to move the files, that correspond to res_counter to the
res_counter.c file and somehow "import" them into controller.  I don't know
how to make it gracefully yet, but merging resets of max_usage and failcnt in
one function will be there for sure.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Paul Menage <menage@google.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 01:00:21 -07:00 committed by Linus Torvalds
parent 85cc59db12
commit 29f2a4dac8
2 changed files with 19 additions and 3 deletions
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8
include/linux/res_counter.h
View File

@ -143,4 +143,12 @@ static inline void res_counter_reset_max(struct res_counter *cnt)
spin_unlock_irqrestore(&cnt->lock, flags);
}
static inline void res_counter_reset_failcnt(struct res_counter *cnt)
{
unsigned long flags;
spin_lock_irqsave(&cnt->lock, flags);
cnt->failcnt = 0;
spin_unlock_irqrestore(&cnt->lock, flags);
}
#endif

14
mm/memcontrol.c
View File

@ -857,12 +857,19 @@ static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
mem_cgroup_write_strategy);
}
static int mem_cgroup_max_reset(struct cgroup *cont, unsigned int event)
static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
{
struct mem_cgroup *mem;
mem = mem_cgroup_from_cont(cont);
res_counter_reset_max(&mem->res);
switch (event) {
case RES_MAX_USAGE:
res_counter_reset_max(&mem->res);
break;
case RES_FAILCNT:
res_counter_reset_failcnt(&mem->res);
break;
}
return 0;
}
@ -916,7 +923,7 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "max_usage_in_bytes",
.private = RES_MAX_USAGE,
.trigger = mem_cgroup_max_reset,
.trigger = mem_cgroup_reset,
.read_u64 = mem_cgroup_read,
},
{
@ -928,6 +935,7 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "failcnt",
.private = RES_FAILCNT,
.trigger = mem_cgroup_reset,
.read_u64 = mem_cgroup_read,
},
{