linux-kernel - Re: [RFC][PATCH 2/2] readahead: avoid page-by-page reads on POSIX_FADV

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Message-ID: <20091231030311.GA12517@localhost>
Date:	Thu, 31 Dec 2009 11:03:11 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Quentin Barnes <qbarnes+nfs@...oo-inc.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: Re: [RFC][PATCH 2/2] readahead: avoid page-by-page reads on
	POSIX_FADV_RANDOM

On Thu, Dec 31, 2009 at 10:53:43AM +0800, Wu Fengguang wrote:

> So how about add a FMODE_HINT_RANDOM_READ bit to file->f_mode?
> Modifying it at fadvise() time at least won't disturb the existing
> open-time-modify-only f_mode bits..

Ah it seems file->f_flags (modified under f_lock) is ideal candidate :)

Thanks,
Fengguang

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