linux-kernel - RE: O_DIRECT question

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Message-ID: <000001c735d5$2fea7830$262d100a@nuitysystems.com>
Date:	Thu, 11 Jan 2007 15:06:50 -0800
From:	"Hua Zhong" <hzhong@...il.com>
To:	"'Phillip Susi'" <psusi@....rr.com>,
	"'Michael Tokarev'" <mjt@....msk.ru>
Cc:	"'Linus Torvalds'" <torvalds@...l.org>,
	"'Viktor'" <vvp01@...ox.ru>, "'Aubrey'" <aubreylee@...il.com>,
	"'Hugh Dickins'" <hugh@...itas.com>,
	<linux-kernel@...r.kernel.org>, <hch@...radead.org>,
	<kenneth.w.chen@...el.com>, <akpm@...l.org>
Subject: RE: O_DIRECT question

> The other problem besides the inability to handle IO errors is that
> mmap()+msync() is synchronous.  You need to go async to keep 
> the pipelines full.

msync(addr, len, MS_ASYNC); doesn't do what you want?

> Now if someone wants to implement an aio version of msync and 
> mlock, that might do the trick.  At least for MMU systems.  
> Non MMU systems just can't play mmap type games.
> 

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