linux-kernel - Re: O_DIRECT question

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Message-ID: <45BA2628.4030502@rtr.ca>
Date:	Fri, 26 Jan 2007 11:02:48 -0500
From:	Mark Lord <lkml@....ca>
To:	Denis Vlasenko <vda.linux@...glemail.com>
Cc:	Michael Tokarev <mjt@....msk.ru>, Phillip Susi <psusi@....rr.com>,
	Linus Torvalds <torvalds@...l.org>, Viktor <vvp01@...ox.ru>,
	Aubrey <aubreylee@...il.com>, Hua Zhong <hzhong@...il.com>,
	Hugh Dickins <hugh@...itas.com>, linux-kernel@...r.kernel.org,
	hch@...radead.org, kenneth.w.chen@in
Subject: Re: O_DIRECT question

You guys need to backup in this thread.

Every example of O_DIRECT here could be replaced with
calls to mmap(), msync(), and madvise() (or posix_fadvise).

In addition to being at least as fast as O_DIRECT,
these have the added benefit of using the page cache 
(avoiding reads for data already present, handling multiple
users of the same data, etc..).

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