linux-kernel - Re: [PATCH 0/11] Per-bdi writeback flusher threads v9

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Message-ID: <20090529170911.GK11363@kernel.dk>
Date:	Fri, 29 May 2009 19:09:11 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	tytso@....edu, chris.mason@...cle.com, david@...morbit.com,
	hch@...radead.org, akpm@...ux-foundation.org, jack@...e.cz,
	yanmin_zhang@...ux.intel.com, richard@....demon.co.uk,
	damien.wyart@...e.fr
Subject: Re: [PATCH 0/11] Per-bdi writeback flusher threads v9

On Fri, May 29 2009, Artem Bityutskiy wrote:
> Artem Bityutskiy wrote:
>> Jens Axboe wrote:
>>> Hi,
>>>
>>> Here's the 9th version of the writeback patches. Changes since v8:
>>>
>>> - Fix a bdi_work on-stack allocation hang. I hope this fixes Ted's
>>>   issue.
>>> - Get rid of the explicit wait queues, we can just use wake_up_process()
>>>   since it's just for that one task.
>>> - Add separate "sync_supers" thread that makes sure that the dirty
>>>   super blocks get written. We cannot safely do this from
>>> bdi_forker_task(),
>>>   as that risks deadlocking on ->s_umount. Artem, I implemented this
>>>   by doing the wake ups from a timer so that it would be easier for you
>>>   to just deactivate the timer when there are no super blocks.
>>>
>>> For ease of patching, I've put the full diff here:
>>>
>>>   http://kernel.dk/writeback-v9.patch
>>>
>>> and also stored this in a writeback-v9 branch that will not change,
>>> you can pull that into Linus tree from here:
>>>
>>>   git://git.kernel.dk/linux-2.6-block.git writeback-v9
>>
>> I'm working with the above branch. Got the following twice.
>> Not sure what triggers this, probably if I do nothing and
>> cpufreq starts doing its magic, this is triggered.
>>
>> And I'm not sure it has something to do with your changes,
>> it is just that I saw this only with your tree. Please,
>> ignore if this is not relevant.
>
> Sorry, probably I shouldn't have reported this before looking
> closer. I'll investigate this later and fine out whether it
> is related to your work or not. Sorry for too early and probably
> false alarm.

No problem. If it does turn out to have some relation to the writeback
stuff, let me know.

-- 
Jens Axboe

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