linux-kernel - Re: [PATCH RESEND v3 0/3] Fix some starvation problems in block layer

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Message-Id: <172909799069.38573.9078542205672825920.b4-ty@kernel.dk>
Date: Wed, 16 Oct 2024 10:59:50 -0600
From: Jens Axboe <axboe@...nel.dk>
To: ming.lei@...hat.com, Muchun Song <muchun.song@...ux.dev>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
 muchun.song@...ux.dev
Subject: Re: [PATCH RESEND v3 0/3] Fix some starvation problems in block
 layer


On Mon, 14 Oct 2024 17:29:31 +0800, Muchun Song wrote:
> We encounter a problem on our servers where hundreds of UNINTERRUPTED
> processes are all waiting in the WBT wait queue. And the IO hung detector
> logged so many messages about "blocked for more than 122 seconds". The
> call trace is as follows:
> 
>     Call Trace:
>         __schedule+0x959/0xee0
>         schedule+0x40/0xb0
>         io_schedule+0x12/0x40
>         rq_qos_wait+0xaf/0x140
>         wbt_wait+0x92/0xc0
>         __rq_qos_throttle+0x20/0x30
>         blk_mq_make_request+0x12a/0x5c0
>         generic_make_request_nocheck+0x172/0x3f0
>         submit_bio+0x42/0x1c0
>         ...
> 
> [...]

Applied, thanks!

[1/3] block: fix missing dispatching request when queue is started or unquiesced
      commit: 4bddfec1a0fb837f66b403a11ee1834769df2330
[2/3] block: fix ordering between checking QUEUE_FLAG_QUIESCED and adding requests
      commit: 542c1c1b4cca00051997f4e1ad330a518e727c79
[3/3] block: fix ordering between checking BLK_MQ_S_STOPPED and adding requests
      commit: 1936f2e6981297621deed9afcdc9063c1964fc5b

Best regards,
-- 
Jens Axboe