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

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Message-ID: <20200205125804.GM14879@hirez.programming.kicks-ass.net>
Date:   Wed, 5 Feb 2020 13:58:04 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     kernel test robot <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
Subject: 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.