linux-kernel - Re: [PATCH] blk-mq: mark hctx RESTART when get budget fails

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Message-ID: <11e10ccf-bdeb-4790-3bec-e3f49ab246c8@oracle.com>
Date:   Mon, 16 Apr 2018 16:34:43 +0800
From:   "jianchao.wang" <jianchao.w.wang@...cle.com>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] blk-mq: mark hctx RESTART when get budget fails

Hi Ming

Thanks for your kindly response.

On 04/16/2018 04:15 PM, Ming Lei wrote:
>> -		if (!blk_mq_get_dispatch_budget(hctx))
>> +		if (!blk_mq_get_dispatch_budget(hctx)) {
>> +			blk_mq_sched_mark_restart_hctx(hctx);
> The RESTART flag still may not take into effect if all requests are
> completed before calling blk_mq_sched_mark_restart_hctx().
> 

Yes, this is indeed a very tricky scenario.

Sincerely
Jianchao