linux-kernel - Re: [PATCH V2 1/3] lib: introduce some memory copy macros and functions

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Message-ID: <20100908150519.2f9fe283@basil.nowhere.org>
Date:	Wed, 8 Sep 2010 15:05:19 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	miaox@...fujitsu.com
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Theodore Ts'o" <tytso@....edu>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Ext4 <linux-ext4@...r.kernel.org>,
	Linux Btrfs <linux-btrfs@...r.kernel.org>
Subject: Re: [PATCH V2 1/3] lib: introduce some memory copy macros and     
 functions

On Wed, 08 Sep 2010 20:57:07 +0800
Miao Xie <miaox@...fujitsu.com> 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?

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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