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

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Message-ID: <CA+55aFwv0WjXdz2SDKgzapCjm-b1mK=yFBW4PxnDGXorvTNpRA@mail.gmail.com>
Date:	Tue, 7 Feb 2012 14:34:48 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	Tejun Heo <tj@...nel.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

On Mon, Feb 6, 2012 at 9:22 PM, Shaohua Li <shaohua.li@...el.com> wrote:
> On Mon, 2012-02-06 at 16:59 -0800, Tejun Heo wrote:
>> * Test with the this_q != locked_q trylock patch.
> this one slightly reduces the regression. without it, the regression is
> about 17%, with it, the regression is about 12%. Test result is stable.

What happens when you remove the fast-case entirely?

See the other patch by Tejun with the subject "[PATCH] block: strip
out locking optimization in put_io_context()"

               Linus
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