linux-kernel - Re: [PATCH] UBI: Block: Add blk-mq support

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Message-ID: <5456D867.5020303@fb.com>
Date:	Sun, 2 Nov 2014 18:20:39 -0700
From:	Jens Axboe <axboe@...com>
To:	Richard Weinberger <richard@....at>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	<hch@...radead.org>, <dedekind1@...il.com>
CC:	<dwmw2@...radead.org>, <computersforpeace@...il.com>,
	<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] UBI: Block: Add blk-mq support

On 2014-11-02 15:49, Richard Weinberger wrote:
> AFAICT blk-mq allocates one struct ubiblock_pdu per device.
> As all IO is done via scattergather the memory footprint should be good.
> But I'm sure Christoph can tell you the glory details.

That is true, the request list and pdu is allocated upfront. If that is 
a problem, the pdu need not be allocated upfront but could be done at IO 
time instead. With that comes a bit more complicated retry handling, for 
memory shortage situations.

-- 
Jens Axboe

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