From: Theodore Ts'o <tytso@mit.edu>
Subject: Re: [GIT PULL URGENT] ext4 regression fix for 3.9
Date: Sat, 2 Mar 2013 18:15:06 -0500
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References: <20130227174553.GA224@x4>
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Cc: Dave Jones <davej@redhat.com>,
	Markus Trippelsdorf <markus@trippelsdorf.de>,
	"gnehzuil.liu" <gnehzuil.liu@gmail.com>,
	Zheng Liu <wenqing.lz@taobao.com>,
	Borislav Petkov <bp@alien8.de>,
	"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
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On Sat, Mar 02, 2013 at 11:54:37AM -0800, Linus Torvalds wrote:
> 
> This needs to be fixed or reverted. I traced back some user
> interaction problems to this same issue. It literally gets so bad that
> the whole system is choppy, and a profile shows that a lot of time is
> being spent in the spin-lock protecting these data structures. Called
> from ext4_es_reclaim_extents_count, ext4_es_lru_add and
> ext4_es_shrink.

I'm doing final testing on a pull request that will fix these
problems.  I'll send it to you later this evening.

	   	     	       	     - Ted