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

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Date:	Wed, 03 Jun 2009 11:11:05 +0300
From:	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"tytso@....edu" <tytso@....edu>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"david@...morbit.com" <david@...morbit.com>,
	"hch@...radead.org" <hch@...radead.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"jack@...e.cz" <jack@...e.cz>,
	"yanmin_zhang@...ux.intel.com" <yanmin_zhang@...ux.intel.com>,
	"richard@....demon.co.uk" <richard@....demon.co.uk>,
	"damien.wyart@...e.fr" <damien.wyart@...e.fr>
Subject: Re: [PATCH 0/11] Per-bdi writeback flusher threads v9

ext Jens Axboe wrote:
> 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.

OK, I'm confirming that I observe this also with pure 2.6.30-rc7
as well.


-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
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