linux-kernel - Re: O_DIRECT question

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Message-ID: <45BA31B3.2020203@inbox.ru>
Date:	Fri, 26 Jan 2007 19:52:03 +0300
From:	Viktor <vvp01@...ox.ru>
To:	Mark Lord <lkml@....ca>
CC:	Denis Vlasenko <vda.linux@...glemail.com>,
	Michael Tokarev <mjt@....msk.ru>,
	Phillip Susi <psusi@....rr.com>,
	Linus Torvalds <torvalds@...l.org>,
	Aubrey <aubreylee@...il.com>, Hua Zhong <hzhong@...il.com>,
	Hugh Dickins <hugh@...itas.com>, linux-kernel@...r.kernel.org,
	hch@...radead.org
Subject: Re: O_DIRECT question

Mark Lord wrote:
> 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).

No. How about handling IO errors? There is no practical way for it with
mmap().

> 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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