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Date:	Wed, 8 Sep 2010 15:05:19 +0200
From:	Andi Kleen <>
Cc:	Peter Zijlstra <>,
	Ingo Molnar <>,
	Andrew Morton <>,
	"Theodore Ts'o" <>,
	Linux Kernel <>,
	Linux Ext4 <>,
	Linux Btrfs <>
Subject: Re: [PATCH V2 1/3] lib: introduce some memory copy macros and     

On Wed, 08 Sep 2010 20:57:07 +0800
Miao Xie <> wrote:

> On Wed, 8 Sep 2010 14:19:25 +0200 (cest), Andi Kleen wrote:
> >
> >> According to the data, the length of the most copies is>=128.
> >
> > Thanks for the data. Large is easier to optimize than small, that's
> > good.
> >
> > Could you also measure how many memsets need the backwards copy?
> > (should be easy to add)
> I think memset doesn't need the backwards copy.

I meant for memmove of course. Obviously memset doesn't need a backwards
copy. That was just the only thing the script didn't measure because
the original version didn't have memmove support.

Your whole thread was about making memmove faster, right?

-- -- Speaking for myself only.
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