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

[Jens Axboe]

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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