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 10:18:50 +0900 [thread overview]
Message-ID: <4FEBB0FA.2070203@kernel.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1206271803280.10830@chino.kir.corp.google.com>
On 06/28/2012 10:06 AM, David Rientjes wrote:
> On Thu, 28 Jun 2012, Minchan Kim wrote:
>
>>>>>>> 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.
>>
>
> If isolate_freepages() is going to fail, then this zone should have been
> skipped when checking for compaction_suitable(). In Jim's perf output,
> compaction_suitable() returns COMPACT_CONTINUE for a transparent hugepage.
> Why is zone_watermark_ok(zone, 0 low_wmark + 1024, 0, 0) succeeding if
> isolate_freepages() is going to fail?
>
zone_watermark_ok doesn't consider migratetype but suitable_migrate_target
does consider one.
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
>
--
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 10:18:50 +0900 [thread overview]
Message-ID: <4FEBB0FA.2070203@kernel.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1206271803280.10830@chino.kir.corp.google.com>
On 06/28/2012 10:06 AM, David Rientjes wrote:
> On Thu, 28 Jun 2012, Minchan Kim wrote:
>
>>>>>>> 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.
>>
>
> If isolate_freepages() is going to fail, then this zone should have been
> skipped when checking for compaction_suitable(). In Jim's perf output,
> compaction_suitable() returns COMPACT_CONTINUE for a transparent hugepage.
> Why is zone_watermark_ok(zone, 0 low_wmark + 1024, 0, 0) succeeding if
> isolate_freepages() is going to fail?
>
zone_watermark_ok doesn't consider migratetype but suitable_migrate_target
does consider one.
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
>
--
Kind regards,
Minchan Kim
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2012-06-28 1:18 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
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 [this message]
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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