linux-kernel - Re: [PATCH v4] dm-io: don't warn if flush takes too long time

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Date: Wed, 17 Apr 2024 10:55:59 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Mikulas Patocka <mpatocka@...hat.com>, Mike Snitzer
 <msnitzer@...hat.com>, Damien Le Moal <dlemoal@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>
Cc: Guangwu Zhang <guazhang@...hat.com>, dm-devel@...ts.linux.dev,
 linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] dm-io: don't warn if flush takes too long time

On 4/17/24 10:51 AM, Mikulas Patocka wrote:
> There was reported hang warning when using dm-integrity on the top of loop
> device on XFS on a rotational disk. The warning was triggered because
> flush on the loop device was too slow.
> 
> There's no easy way to reduce the latency, so I made a patch that shuts
> the warning up.
> 
> There's already a function blk_wait_io that avoids the hung task warning.
> This commit moves this function from block/blk.h to
> kernel/sched/completion.c, renames it to wait_for_completion_long_io
> (because it is not dependent on the block layer at all) and uses it in
> dm-io instead of wait_for_completion_io.

Looks good to me, though I'd probably split out that dm change as it's a
new addition where the other parts are strictly mechanical (moving the
helper to where it belongs, and using it where we already do it).

-- 
Jens Axboe