From: Minchan Kim <minchan@kernel.org>
To: David Rientjes <rientjes@google.com>
Cc: Rik van Riel <riel@redhat.com>, Jim Schutt <jaschut@sandia.gov>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
"ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: Re: excessive CPU utilization by isolate_freepages?
Date: Thu, 28 Jun 2012 09:58:42 +0900 [thread overview]
Message-ID: <4FEBAC42.3030800@kernel.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1206271745170.9552@chino.kir.corp.google.com>
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
WARNING: multiple messages have this Message-ID (diff)
From: Minchan Kim <minchan@kernel.org>
To: David Rientjes <rientjes@google.com>
Cc: Rik van Riel <riel@redhat.com>, Jim Schutt <jaschut@sandia.gov>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
"ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: Re: excessive CPU utilization by isolate_freepages?
Date: Thu, 28 Jun 2012 09:58:42 +0900 [thread overview]
Message-ID: <4FEBAC42.3030800@kernel.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1206271745170.9552@chino.kir.corp.google.com>
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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next prev parent reply other threads:[~2012-06-28 0:58 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-27 21:59 excessive CPU utilization by isolate_freepages? Jim Schutt
2012-06-27 21:59 ` Jim Schutt
2012-06-27 22:35 ` Mark Nelson
2012-06-27 22:35 ` Mark Nelson
2012-06-27 23:59 ` Minchan Kim
2012-06-27 23:59 ` Minchan Kim
2012-06-28 0:28 ` Rik van Riel
2012-06-28 0:28 ` Rik van Riel
2012-06-28 0:52 ` David Rientjes
2012-06-28 0:52 ` David Rientjes
2012-06-28 0:58 ` Minchan Kim [this message]
2012-06-28 0:58 ` Minchan Kim
2012-06-28 1:06 ` David Rientjes
2012-06-28 1:06 ` David Rientjes
2012-06-28 1:18 ` Minchan Kim
2012-06-28 1:18 ` Minchan Kim
2012-06-28 1:13 ` Rik van Riel
2012-06-28 1:13 ` Rik van Riel
2012-06-28 0:55 ` Minchan Kim
2012-06-28 0:55 ` Minchan Kim
2012-06-28 11:36 ` Mel Gorman
2012-06-28 11:36 ` Mel Gorman
2012-06-28 15:30 ` Jim Schutt
2012-06-28 15:30 ` Jim Schutt
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