linux-kernel - Re: [PATCH 1/9] readahead: introduce PG

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Message-Id: <1181610294.16428.133.camel@localhost.localdomain>
Date:	Tue, 12 Jun 2007 11:04:54 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Fengguang Wu <wfg@...l.ustc.edu.cn>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	Steven Pratt <slpratt@...tin.ibm.com>,
	Ram Pai <linuxram@...ibm.com>
Subject: Re: [PATCH 1/9] readahead: introduce PG_readahead

On Thu, 2007-05-17 at 06:47 +0800, Fengguang Wu wrote:
> plain text document attachment (mm-introduce-pg_readahead.patch)
> Introduce a new page flag: PG_readahead.
> 
> It acts as a look-ahead mark, which tells the page reader:
> Hey, it's time to invoke the read-ahead logic.  For the sake of I/O pipelining,
> don't wait until it runs out of cached pages!

Hi Fengguang!

	I've been reading your patches, and I have some (possibly dumb!)
questions.

For this patch: why set a bit in the page, rather than keep a value
inside the "struct file_ra_state"?

Thanks,
Rusty.


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