linux-kernel - Re: [PATCH v3 5/7] zram: Convert to using memset

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Date:   Mon, 27 Mar 2017 14:01:34 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-fbdev@...r.kernel.org>,
        <linux-arch@...r.kernel.org>, <linux-alpha@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <x86@...nel.org>,
        <linux-mips@...ux-mips.org>, <linuxppc-dev@...ts.ozlabs.org>,
        <sparclinux@...r.kernel.org>,
        Matthew Wilcox <mawilcox@...rosoft.com>
Subject: Re: [PATCH v3 5/7] zram: Convert to using memset_l

On Fri, Mar 24, 2017 at 09:13:16AM -0700, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawilcox@...rosoft.com>
> 
> zram was the motivation for creating memset_l().  Minchan Kim sees a 7%
> performance improvement on x86 with 100MB of non-zero deduplicatable
> data:
> 
>         perf stat -r 10 dd if=/dev/zram0 of=/dev/null
> 
> vanilla:        0.232050465 seconds time elapsed ( +-  0.51% )
> memset_l:	0.217219387 seconds time elapsed ( +-  0.07% )
> 
> Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
> Tested-by: Minchan Kim <minchan@...nel.org>
Acked-by: Minchan Kim <minchan@...nel.org>

Thanks!