linux-kernel - Re: excessive CPU utilization by isolate

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Message-ID: <4FEBAC42.3030800@kernel.org>
Date:	Thu, 28 Jun 2012 09:58:42 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, ceph-devel@...r.kernel.org
Subject: Re: excessive CPU utilization by isolate_freepages?

On 06/28/2012 09:52 AM, David Rientjes wrote:

> On Wed, 27 Jun 2012, Rik van Riel wrote:
> 
>>> > > I doubt compaction try to migrate continuously although we have no free
>>> > > memory.
>>> > > Could you apply this patch and retest?
>>> > > 
>>> > > https://lkml.org/lkml/2012/6/21/30
>> > 
> Not sure if Jim is using memcg; if not, then this won't be helpful.
> 

It doesn't related to memcg.
if compaction_alloc can't find suitable migration target, it returns NULL.
Then, migrate_pages should be exit.

-- 
Kind regards,
Minchan Kim

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