linux-kernel - Re: [patch 2/3] memcg: prevent endless loop when charging huge pages to near-limit group

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Date:	Tue, 1 Feb 2011 01:34:51 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	kamezawa.hiroyu@...fujitsu.com, nishimura@....nes.nec.co.jp,
	balbir@...ux.vnet.ibm.com, minchan.kim@...il.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/3] memcg: prevent endless loop when charging huge pages
 to near-limit group

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@...xchg.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@...xchg.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))
--
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