linux-kernel - Re: Sync writeback still broken

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Message-ID: <AANLkTimYJy8Yqtmqeg7DjnvPbfhq5LwY27mY8K+iGQFA@mail.gmail.com>
Date:	Fri, 5 Nov 2010 14:41:33 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Jan Engelhardt <jengelh@...ozas.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>, stable@...nel.org,
	gregkh@...e.de
Subject: Re: Sync writeback still broken

On Fri, Nov 5, 2010 at 2:34 PM, Jan Kara <jack@...e.cz> wrote:
> On Fri 05-11-10 22:33:24, Jan Kara wrote:
>>   I needed one more patch to resolve the issue (attached) which I've just
>> posted for review and possible inclusion. I had a similar one long time ago
>> but now I'm better able to explain why it works because of tracepoints.
>> Yay! ;). With those three patches I'm not able to trigger livelocks (but
>> sync takes still 15 minutes because the througput to disk is about 4MB/s -
>> no big surprise given the random nature of the load)
>  PS: And big thanks to you for providing the test case and your
> persistence ;)

Ok, I'm inclined to just apply these three patches. Can we get a quick
ack/tested-by for them? I'm sure there's more work to be done, but
let's put this damn thing to rest if it really does fix the problem
Jan(E) sees.

Comments?

                     Linus
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