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

Artem Bityutskiy
2009-05-29T16:21:41Z

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.

--
Best Regards,
Artem Bityutskiy (Артём Битюцкий)