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From: Peter Zijlstra <peterz@infradead.org>
To: Huang Ying <ying.huang@intel.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>,
LKML <linux-kernel@vger.kernel.org>, LKP ML <lkp@01.org>
Subject: Re: [LKP] [timer] 17cdf560f27: +4.0% boot-meminfo.VmallocUsed
Date: Thu, 2 Apr 2015 09:54:43 +0200 [thread overview]
Message-ID: <20150402075443.GR23123@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1427936769.6726.2.camel@intel.com>
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?
next prev parent reply other threads:[~2015-04-02 7:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-02 1:06 Huang Ying
2015-04-02 7:54 ` Peter Zijlstra [this message]
[not found] ` <CAC=cRTNjmJF6icPUrWdgJu8wcX-fKpgTo9V4o6wA5z-8sfncwA@mail.gmail.com>
2015-04-03 14:23 ` Peter Zijlstra
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