linux-kernel - Re: O_DIRECT question

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Message-ID: <45A70EF9.40408@yahoo.com.au>
Date:	Fri, 12 Jan 2007 15:30:49 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Bill Davidsen <davidsen@....com>
CC:	Andrew Morton <akpm@...l.org>, Linus Torvalds <torvalds@...l.org>,
	Hua Zhong <hzhong@...il.com>, Hugh Dickins <hugh@...itas.com>,
	linux-kernel@...r.kernel.org, hch@...radead.org,
	kenneth.w.chen@...el.com, mjt@....msk.ru
Subject: Re: O_DIRECT question

Bill Davidsen wrote:
> Nick Piggin wrote:
> 
>> Aubrey wrote:
>>
>> Exactly, and the *real* fix is to modify userspace not to make > 
>> PAGE_SIZE
>> mallocs[*] if it is to be nommu friendly. It is the kernel hacks to do 
>> things
>> like limit cache size that are the bandaids.
> 
> 
> Tuning the system to work appropriately for a given load is not a 
> band-aid.

We are talking about about fragmentation. And limiting pagecache to try to
avoid fragmentation is a bandaid, especially when the problem can be solved
(not just papered over, but solved) in userspace.

-- 
SUSE Labs, Novell Inc.
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