linux-kernel - Re: [LKP] [timer] 17cdf560f27: +4.0% boot-meminfo.VmallocUsed

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Date:	Fri, 3 Apr 2015 16:23:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	huang ying <huang.ying.caritas@...il.com>
Cc:	Huang Ying <ying.huang@...el.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [timer] 17cdf560f27: +4.0% boot-meminfo.VmallocUsed

On Fri, Apr 03, 2015 at 09:03:48AM +0800, huang ying wrote:
> On Thu, Apr 2, 2015 at 3:54 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Thu, Apr 02, 2015 at 09:06:09AM +0800, Huang Ying wrote:
> > > FYI, we noticed the below changes on
> > >
> > > git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git
> > timer/alloc_tvec_statically
> > > commit 17cdf560f2727f687ab159707d0aa591f8a2f82d ("timer: Allocate
> > per-cpu tvec_base's statically")
> > >
> > >
> > > testbox/testcase/testparams: lkp-sbx04/boot/performance-1
> > >
> > > c5e77f5216abdd1d  17cdf560f2727f687ab159707d
> > > ----------------  --------------------------
> > >          %stddev     %change         %stddev
> > >              \          |                \
> > >     410996 ±  0%      +4.0%     427412 ±  0%  boot-meminfo.VmallocUsed
> > >
> > > testbox/testcase/testparams: wsm/boot/performance-1
> > >
> > > c5e77f5216abdd1d  17cdf560f2727f687ab159707d
> > > ----------------  --------------------------
> > >      85712 ±  0%      +2.4%      87772 ±  0%  boot-meminfo.VmallocUsed
> > >
> > > testbox/testcase/testparams: lkp-snb01/boot/performance-1
> > >
> > > c5e77f5216abdd1d  17cdf560f2727f687ab159707d
> > > ----------------  --------------------------
> > >     447001 ±  0%      -1.0%     442558 ±  0%  boot-slabinfo.num_objs
> > >     125616 ±  5%     -13.5%     108720 ±  4%  boot-meminfo.DirectMap4k
> > >     347196 ±  0%      +4.7%     363612 ±  0%  boot-meminfo.VmallocUsed
> > >
> >
> > well, duh.. it changes a dynamic allocation into a static per-cpu one.
> > What did you expect?
> >
> 
> Just FYI.  This may be the expected behavior.  If so, you have a third
> party test report.

Ah ok. I thought you thought it was a bug/regression.

Thanks
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