linux-ext4 - Re: [GIT PULL URGENT] ext4 regression fix for 3.9

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Message-ID: <20130301040039.GA4452@thunk.org>
Date:	Thu, 28 Feb 2013 23:00:39 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	"gnehzuil.liu" <gnehzuil.liu@...il.com>,
	Zheng Liu <wenqing.lz@...bao.com>,
	Borislav Petkov <bp@...en8.de>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL URGENT] ext4 regression fix for 3.9

On Thu, Feb 28, 2013 at 10:30:05PM -0500, Dave Jones wrote:
> 
> This has fixed the problem I reported, but I notice now that my
> desktop is really sluggish. perf top shows it's almost constantly
> spinning in ext4_es_reclaim_extents_count
> 
> Any ideas ?

ext4_es_reclaim_extents_count() is getting called out of the slab
shrinker.  It's getting called too often when there is significant
memory pressure.  We can optimize this so we're not calculating it all
the time.

						- Ted
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