linux-kernel - Re: [LKP] [ftrace] fef5aeeee9e: -27.2% boot-slabinfo.num

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Message-ID: <20141223083214.0b199465@gandalf.local.home>
Date:	Tue, 23 Dec 2014 08:32:14 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Huang Ying <ying.huang@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [ftrace] fef5aeeee9e: -27.2% boot-slabinfo.num_objs

On Tue, 23 Dec 2014 11:10:17 +0800
Huang Ying <ying.huang@...el.com> wrote:

> FYI, we noticed the below changes on
> 
> commit fef5aeeee9e3717e7aea991a7ae9ff6a7a2d4c85 ("ftrace: Replace tramp_hash with old_*_hash to save space")
> 
> 
> testbox/testcase/testparams: vm-kbuild-4G/boot/1
> 
> e1effa0144a1ddf5  fef5aeeee9e3717e7aea991a7a  
> ----------------  --------------------------  
>          %stddev     %change         %stddev
>              \          |                \  
>     437752 ±  0%     -27.2%     318545 ±  0%  boot-slabinfo.num_objs
> 
> vm-kbuild-4G: qemu-system-x86_64 -enable-kvm
> Memory: 4G

I have no idea what this test does. Is this good or bad? Is that -27.2%
a performance regression, or memory regression?

-- Steve


> 
> 
> 
>                                boot-slabinfo.num_objs
> 
>   440000 *+*--*-*-*------*----*-*-*--*--------*-*--*-*-*--*-----------------+
>          |           *.*   *.          *.*..*                               |
>   420000 ++                                                                 |
>          |                                                                  |
>   400000 ++                                                                 |
>          |                                                                  |
>   380000 ++                                                                 |
>          |                                                                  |
>   360000 ++                                                                 |
>          |                                                                  |
>   340000 ++                                                                 |
>          |                                                                  |
>   320000 O+O  O   O  O O O O  O O O  O O    O O O    O O  O O O O  O O O  O O
>          |      O                        O         O                        |
>   300000 ++-----------------------------------------------------------------+
> 
> 	[*] bisect-good sample
> 	[O] bisect-bad  sample
> 
> To reproduce:
> 
> 	apt-get install ruby ruby-oj
> 	git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
> 	cd lkp-tests
> 	bin/setup-local job.yaml # the job file attached in this email
> 	bin/run-local   job.yaml
> 
> 
> Disclaimer:
> Results have been estimated based on internal Intel analysis and are provided
> for informational purposes only. Any difference in system hardware or software
> design or configuration may affect actual performance.
> 
> 
> Thanks,
> Huang, Ying
> 

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