Re: [PATCH] bcache: fix uninterruptible sleep in writeback thread

[Francis Moreau <francis.moro@gmail.com>]

Hi,

On 06/02/2014 04:07 PM, Francis Moreau wrote:
> Hello,
> 
> On 05/15/2014 07:30 PM, Jens Axboe wrote:
>> On 05/15/2014 02:02 AM, Francis Moreau wrote:
>>> Hello Jens,
>>>
>>> On 05/12/2014 08:27 PM, Peter Kieser wrote:
>>>>
>>>> On 2014-05-05 3:30 PM, Nikolay Amiantov wrote:
>>>>> 2014-05-02 1:52 GMT+04:00 Slava Pestov <sp@datera.io>:
>>>>>> There were two issues here:
>>>>>>
>>>>>> - writeback thread did not start until the device first became dirty
>>>>>> - writeback thread used uninterruptible sleep once running
>>>>>>
>>>>>> Without this patch I see kernel warnings printed and a load average of
>>>>>> 1.52 after booting my test VM. With this patch the warnings are gone and
>>>>>> the load average is near 0.00 as expected.
>>>>> I've tried this patch and it has indeed fixed [1]! Thanks!
>>>>>
>>>>> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=69471
>>>>
>>>> Kent,
>>>>
>>>> Could you please review this patch, and have it pushed upstream?
>>>>
>>>
>>> Would it be possible to merge this patch directly before 3.15 is being
>>> released since kent don't seem to care about bugs in bcache or maybe he
>>> does but very selectively ?
>>>
>>> Also it would be great that stable trees will be fixed.
>>>
>>> Eventually I would suggest to mark bcache as an experimental thing since
>>> it's really not ready for production, just take a look at the bcache
>>> mailing list to see why. At least people won't be disappointed when
>>> they'll use bcache and see ton of koops.
>>
>> I'd really like to get Kent to weigh in on this. Sometimes it appears
>> straightforward to switch from uninterruptible to interruptible sleep,
>> but then signals get in the way.
>>
> 
> Any progress ?
> 

still present on 3.15.5-2-ARCH :-/

Bye