linux-kernel - Re: [PATCH V2] block: fix the DISCARD request merge

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Message-ID: <20181022090849.GA19053@lst.de>
Date:   Mon, 22 Oct 2018 11:08:49 +0200
From:   Christoph Hellwig <hch@....de>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jianchao Wang <jianchao.w.wang@...cle.com>, axboe@...nel.dk,
        martin.petersen@...cle.com, tom.leiming@...il.com, hch@....de,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] block: fix the DISCARD request merge

On Mon, Oct 22, 2018 at 05:06:02PM +0800, Ming Lei wrote:
> 
> The above may be changed to 'if (blk_try_merge(req) == ELEVATOR_DISCARD_MERGE)'
> or sort of in future, which may has document benefit at least, since
> ELEVATOR_DISCARD_MERGE means multi-segment discard merge.

I like that idea, and we should do it for the respin