linux-kernel - Re: [RFC PATCH 0/4] kstrdup optimization

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Message-id: <54A3F488.8060904@samsung.com>
Date:	Wed, 31 Dec 2014 14:05:12 +0100
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	linux-mm@...ck.org
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/4] kstrdup optimization

On 12/29/2014 03:48 PM, Andrzej Hajda wrote:

(...)

> As I have tested it on mobile platform (exynos4210-trats) it saves above 2600
> string duplications. Below simple stats about the most frequent duplications:
> Count String
>   880 power
>   874 subsystem
>   130 device
>   126 parameters
>    61 iommu_group
>    40 driver
>    28 bdi
>    28 none
>    25 sclk_mpll
>    23 sclk_usbphy0
>    23 sclk_hdmi24m
>    23 xusbxti
>    22 sclk_vpll
>    22 sclk_epll
>    22 xxti
>    20 sclk_hdmiphy
>    11 aclk100

Minor update, printk buffer was too short during tests so I have not
catched everything. In fact the patchset saves 3260 duplications. Below
stats per kstrdup_const caller:
   2260 __kernfs_new_node+0x28/0xc4
    631 clk_register+0xc8/0x1b8
    318 clk_register+0x34/0x1b8
     51 kmem_cache_create+0x7c/0x1c8

Regards
Andrzej

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