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

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Message-ID: <1419820095.26403.77.camel@intel.com>
Date:	Mon, 29 Dec 2014 10:28:15 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [ftrace] fef5aeeee9e: -27.2% boot-slabinfo.num_objs

On Tue, 2014-12-23 at 08:32 -0500, Steven Rostedt wrote:
> 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?

IMO, it is good.  Memory usage is reduced.

Best Regards,
Huang, Ying

> -- 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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