linux-kernel - Re: [patch]block: fix ioc locking warning

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Message-ID: <20120207003948.GE21292@google.com>
Date:	Mon, 6 Feb 2012 16:39:48 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	lkml <linux-kernel@...r.kernel.org>,
	Knut Petersen <Knut_Petersen@...nline.de>, mroos@...ux.ee
Subject: Re: [patch]block: fix ioc locking warning

Hello,

On Tue, Feb 07, 2012 at 08:31:22AM +0800, Shaohua Li wrote:
> Since you are talking about performance, one of our microbenchmark (swap)
> shows a regression. Alex bisect it to be b2efa05265d62bc2, which is related to
> the ioc change. A little strange to me, don't expect such change can cause
> performance issue. I haven't double check the issue, but if you have
> ideas, please let me know.

Hmmm... I think the only thing which can be made slower by that patch
is ioc release (ie. task exits).  What does the microbench do?

Thanks.

-- 
tejun
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