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

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

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 ?

Thanks.