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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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