linux-kernel - RE: [LKP] Re: [perf/x86] 81ec3f3c4c: will-it-scale.per_process

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Message-ID: <831EE4E5E37DCC428EB295A351E6624952397CCF@shsmsx102.ccr.corp.intel.com>
Date:   Thu, 6 Feb 2020 03:04:19 +0000
From:   "Li, Philip" <philip.li@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        "Chen, Rong A" <rong.a.chen@...el.com>
CC:     Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Jiri Olsa <jolsa@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Stephane Eranian <eranian@...gle.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        "lkp@...ts.01.org" <lkp@...ts.01.org>
Subject: RE: [LKP] Re: [perf/x86] 81ec3f3c4c: will-it-scale.per_process_ops
 -5.5% regression

> Subject: [LKP] Re: [perf/x86] 81ec3f3c4c: will-it-scale.per_process_ops -5.5%
> regression
> 
> On Wed, Feb 05, 2020 at 08:32:16PM +0800, kernel test robot wrote:
> > Greeting,
> >
> > FYI, we noticed a -5.5% regression of will-it-scale.per_process_ops due to
> commit:
> >
> >
> > commit: 81ec3f3c4c4d78f2d3b6689c9816bfbdf7417dbb ("perf/x86: Add
> check_period PMU callback")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> >
> 
> I'm fairly sure this bisect/result is bogus.
Hi Peter, thanks for feedback, we will investigate this in earliest time.

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