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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. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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