From: Vlastimil Babka <vbabka@suse.cz>
To: Markus Trippelsdorf <markus@trippelsdorf.de>, linux-mm@kvack.org
Subject: Re: isolate_freepages_block(): very high intermittent overhead
Date: Mon, 27 Oct 2014 23:01:41 +0100 [thread overview]
Message-ID: <544EC0C5.7050808@suse.cz> (raw)
In-Reply-To: <20141027204003.GB348@x4>
On 10/27/2014 09:40 PM, Markus Trippelsdorf wrote:
> On my v3.18-rc2 kernel isolate_freepages_block() sometimes shows up very
> high (>20%) in perf top during the configuration phase of software
> builds. It increases build time considerably.
>
> Unfortunately the issue is not 100% reproducible, because it appears
> only intermittently. And the symptoms vanish after a few minutes.
Does it happen for long enough so you can capture it by perf record -g ?
Vlastimil
> I think the "mm, compaction" series from Vlastimil is to blame, but it's
> hard to be sure when bisection doesn't work.
>
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next prev parent reply other threads:[~2014-10-27 22:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-27 20:40 isolate_freepages_block(): very high intermittent overhead Markus Trippelsdorf
2014-10-27 21:06 ` Markus Trippelsdorf
2014-10-27 22:01 ` Vlastimil Babka [this message]
2014-10-28 8:59 ` Markus Trippelsdorf
2014-10-29 15:08 ` Vlastimil Babka
2014-11-06 11:42 ` Vlastimil Babka
2014-11-06 11:53 ` Markus Trippelsdorf
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