Re: [PATCH] SCSI: don't get target/host busy_count in scsi_mq_get_budget()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 11/07/2017 05:39 PM, Ming Lei wrote:
> On Tue, Nov 07, 2017 at 04:20:08PM +0000, Bart Van Assche wrote:
>> On Tue, 2017-11-07 at 10:11 +0800, Ming Lei wrote:
>>> If you can reproduce, please provide me at least the following log
>>> first:
>>>
>>> 	find /sys/kernel/debug/block -name tags | xargs cat | grep busy
>>>
>>> If any pending requests arn't completed, please provide the related
>>> info in dbgfs about where is the request.
>>
>> Every time I ran the above or a similar command its output was empty. I
>> assume that's because the hang usually occurs in a phase where these debugfs
>> attributes either have not yet been created or have already disappeared.
> 
> Could you dump all tags? Then you can see if this attribute is disappeared.
> 
> If that output is empty, it often means there isn't pending request not
> completed. So if that is true, your hang is _not_ related with RESTART.

You need to check sched_tags as well. It could still be a restart race
or problem, if tags is empty but sched_tags has busy bits.

-- 
Jens Axboe




[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [SCSI Target Devel]     [Linux SCSI Target Infrastructure]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Linux IIO]     [Samba]     [Device Mapper]

  Powered by Linux