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From: Johannes Weiner <hannes@cmpxchg.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: kamezawa.hiroyu@jp.fujitsu.com, nishimura@mxp.nes.nec.co.jp,
	balbir@linux.vnet.ibm.com, minchan.kim@gmail.com,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [patch 2/3] memcg: prevent endless loop when charging huge pages to near-limit group
Date: Tue, 1 Feb 2011 01:34:51 +0100	[thread overview]
Message-ID: <20110201003451.GC19534@cmpxchg.org> (raw)
In-Reply-To: <20110131162448.e791f0ae.akpm@linux-foundation.org>

On Mon, Jan 31, 2011 at 04:24:48PM -0800, Andrew Morton wrote:
> On Tue, 1 Feb 2011 01:04:55 +0100
> Johannes Weiner <hannes@cmpxchg.org> wrote:
> > @@ -182,6 +182,14 @@ static inline bool res_counter_check_under_limit(struct res_counter *cnt)
> >  	return ret;
> >  }
> >  
> > +/**
> > + * res_counter_check_margin - check if the counter allows charging
> > + * @cnt: the resource counter to check
> > + * @bytes: the number of bytes to check the remaining space against
> > + *
> > + * Returns a boolean value on whether the counter can be charged
> > + * @bytes or whether this would exceed the limit.
> > + */
> >  static inline bool res_counter_check_margin(struct res_counter *cnt,
> >  					    unsigned long bytes)
> >  {
> 
> mem_cgroup_check_margin() needs some lipstick too.

*oink*

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9e5de7c..6c07554 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1111,6 +1111,14 @@ static bool mem_cgroup_check_under_limit(struct mem_cgroup *mem)
 	return false;
 }
 
+/**
+ * mem_cgroup_check_margin - check if the memory cgroup allows charging
+ * @mem: memory cgroup to check
+ * @bytes: the number of bytes the caller intends to charge
+ *
+ * Returns a boolean value on whether @mem can be charged @bytes or
+ * whether this would exceed the limit.
+ */
 static bool mem_cgroup_check_margin(struct mem_cgroup *mem, unsigned long bytes)
 {
 	if (!res_counter_check_margin(&mem->res, bytes))

  reply	other threads:[~2011-02-01  0:35 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-31 14:03 Johannes Weiner
2011-01-31 14:03 ` [patch 1/3] memcg: prevent endless loop when charging huge pages Johannes Weiner
2011-01-31 22:27   ` Minchan Kim
2011-01-31 23:48   ` KAMEZAWA Hiroyuki
2011-01-31 14:03 ` [patch 2/3] memcg: prevent endless loop when charging huge pages to near-limit group Johannes Weiner
2011-01-31 22:41   ` Andrew Morton
2011-01-31 23:50     ` KAMEZAWA Hiroyuki
2011-02-01  0:04     ` Johannes Weiner
2011-02-01  0:24       ` Andrew Morton
2011-02-01  0:34         ` Johannes Weiner [this message]
2011-02-03 12:53         ` [patch 0/2] memcg: clean up limit checking Johannes Weiner
2011-02-03 12:54           ` [patch 1/2] memcg: soft limit reclaim should end at limit not below Johannes Weiner
2011-02-03 23:41             ` KAMEZAWA Hiroyuki
2011-02-04  4:10             ` Balbir Singh
2011-02-03 12:56           ` [patch 2/2] memcg: simplify the way memory limits are checked Johannes Weiner
2011-02-03 23:44             ` KAMEZAWA Hiroyuki
2011-02-04  4:12             ` Balbir Singh
2011-01-31 22:42   ` [patch 2/3] memcg: prevent endless loop when charging huge pages to near-limit group Minchan Kim
2011-01-31 14:03 ` [patch 3/3] memcg: never OOM when charging huge pages Johannes Weiner
2011-01-31 22:52   ` Minchan Kim
2011-01-31 23:51   ` KAMEZAWA Hiroyuki

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