linux-kernel - Re: [PATCH] mm: PageLRU can be non-atomic bit operation

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Date:	Tue, 24 Apr 2007 20:13:15 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>
CC:	Hugh Dickins <hugh@...itas.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: PageLRU can be non-atomic bit operation

Hisashi Hifumi wrote:
> 
> At 11:47 07/04/24, Nick Piggin wrote:
> 
>  >As Hugh points out, we must have atomic ops here, so changing the generic
>  >code to use the __ version is wrong. However if there is a faster way 
> that
>  >i386 can perform the atomic variant, then doing so will speed up the 
> generic
>  >code without breaking other architectures.
>  >
> 
> Do you mean writing page-flags.h specific for i386 so improving generic 
> code
> and without breaking other architectures ?

I meant improving the i386 bitops specific code.

However if there is some variant of operation that is not captured
with the current bitop API, but could provide a useful speedup of
common page flag manipulations, then you might consider extending
the bitop API and making page-flags.h use that new operation.

-- 
SUSE Labs, Novell Inc.
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