linux-kernel - Re: [PATCH v2 1/2] blk-mq: In blk_mq_dispatch_rq

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Message-ID: <20200403015516.GC6987@ming.t460p>
Date:   Fri, 3 Apr 2020 09:55:16 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     axboe@...nel.dk, jejb@...ux.ibm.com, martin.petersen@...cle.com,
        paolo.valente@...aro.org, sqazi@...gle.com,
        linux-block@...r.kernel.org, linux-scsi@...r.kernel.org,
        groeck@...omium.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] blk-mq: In blk_mq_dispatch_rq_list() "no budget"
 is a reason to kick

On Thu, Apr 02, 2020 at 08:51:29AM -0700, Douglas Anderson wrote:
> In blk_mq_dispatch_rq_list(), if blk_mq_sched_needs_restart() returns
> true and the driver returns BLK_STS_RESOURCE then we'll kick the
> queue.  However, there's another case where we might need to kick it.
> If we were unable to get budget we can be in much the same state as
> when the driver returns BLK_STS_RESOURCE, so we should treat it the
> same.

The situation is really similar, especially the restart handler may
not see the request which may not be added to hctx->dispatch, so

Reviewed-by: Ming Lei <ming.lei@...hat.com>


Thanks, 
Ming