linux-kernel - Re: [PATCH] block_dev: implement readpages() to optimize sequential read

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Message-ID: <x49pph325wj.fsf@segfault.boston.devel.redhat.com>
Date:	Thu, 17 Jul 2014 14:31:56 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] block_dev: implement readpages() to optimize sequential read

Akinobu Mita <akinobu.mita@...il.com> writes:

> Sequential read from a block device is expected to be equal or faster
> than from the file on a filesystem.  But it is not correct due to the
> lack of effective readpages() in the address space operations for
> block device.

Ah, a trip down memory lane.  ;-)  Here's a thread showing issues with
the last time this was proposed (by me, incidentally):

https://lkml.org/lkml/2009/6/2/480

At the very least, we need to see numbers on a real device, and see it
booted on something with >4k page size before taking this back in.

Cheers,
Jeff
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