linux-kernel - Re: [PATCH] Add readpages support for block devices

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Message-ID: <20101219033552.GA9247@localhost>
Date:	Sun, 19 Dec 2010 11:35:52 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	Jens Axboe <jaxboe@...ionio.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org,
	Shane Michael Matthews <shane.matthews@...el.com>,
	Jeff Moyer <jmoyer@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	"Luck, Tony" <tony.luck@...el.com>,
	Florian Mickler <florian@...kler.org>
Subject: Re: [PATCH] Add readpages support for block devices

On Sat, Dec 18, 2010 at 10:20:49AM +0100, Christoph Hellwig wrote:
> We already used to have this and Jens reverted it in commit
> 172124e220f1854acc99ee394671781b8b5e2120.  I can't find a better
> explanation than his rather brief commit message, but he might not more.

The discussion goes here

http://www.gossamer-threads.com/lists/linux/kernel/1085325?do=post_view_threaded#1085325

The problem happens on ext3 fs, non-4k aligned partition and 64K page
size. Jeff also find it hurts dump performance. Then it's reverted
since no one seems to have the time to dig further.

Thanks,
Fengguang
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