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memcgroup: implement failcounter reset

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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
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