linux-kernel - Re: stalling IO regression since linux 5.12, through 5.18

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Date:   Thu, 18 Aug 2022 13:15:12 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Chris Murphy <lists@...orremedies.com>
Cc:     Nikolay Borisov <nborisov@...e.com>, Jens Axboe <axboe@...nel.dk>,
        Jan Kara <jack@...e.cz>,
        Paolo Valente <paolo.valente@...aro.org>,
        Btrfs BTRFS <linux-btrfs@...r.kernel.org>,
        Linux-RAID <linux-raid@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Josef Bacik <josef@...icpanda.com>
Subject: Re: stalling IO regression since linux 5.12, through 5.18

On Thu, Aug 18, 2022 at 12:27:04AM -0400, Chris Murphy wrote:
> 
> 
> On Thu, Aug 18, 2022, at 12:18 AM, Chris Murphy wrote:
> > On Thu, Aug 18, 2022, at 12:12 AM, Chris Murphy wrote:
> >> On Wed, Aug 17, 2022, at 11:41 PM, Ming Lei wrote:
> >>
> >>> OK, can you post the blk-mq debugfs log after you trigger it on v5.17?
> 
> Same boot, 3rd log. But the load is above 300 so I kinda need to sysrq+b soon.
> 
> https://drive.google.com/file/d/1375H558kqPTdng439rvG6LuXXWPXLToo/view?usp=sharing
> 

Please test the following patch and see if it makes a difference:

diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index a4f7c101b53b..8e8d77e79dd6 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -44,7 +44,10 @@ void __blk_mq_sched_restart(struct blk_mq_hw_ctx *hctx)
 	 */
 	smp_mb();
 
-	blk_mq_run_hw_queue(hctx, true);
+	if (blk_mq_is_shared_tags(hctx->flags))
+		blk_mq_run_hw_queues(hctx->queue, true);
+	else
+		blk_mq_run_hw_queue(hctx, true);
 }
 
 static int sched_rq_cmp(void *priv, const struct list_head *a,


Thanks,
Ming