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Date:   Tue, 22 Jan 2019 00:25:15 +0300
From:   Alexey Dobriyan <adobriyan@gmail.com>
To:     Kees Cook <keescook@chromium.org>
Cc:     kernel test robot <rong.a.chen@intel.com>,
        Waiman Long <longman@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Jonathan Corbet <corbet@lwn.net>,
        LKML <linux-kernel@vger.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
        "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
        Davidlohr Bueso <dave@stgolabs.net>,
        Miklos Szeredi <miklos@szeredi.hu>,
        Daniel Colascione <dancol@google.com>,
        Dave Chinner <david@fromorbit.com>,
        Randy Dunlap <rdunlap@infradead.org>, LKP <lkp@01.org>
Subject: Re: [LKP] [/proc/stat] 3047027b34: reaim.jobs_per_min -4.8%
 regression
Message-ID: <20190121212515.GA18118@avx2>
References: <1546873978-27797-3-git-send-email-longman@redhat.com>
 <20190118084456.GA10690@shao2-debian>
 <CAGXu5j+aEs3bq5Ym+VCYGmPQNJZC44vFk9MJDxH1zq=hZ3N4CA@mail.gmail.com>
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On Tue, Jan 22, 2019 at 09:02:53AM +1300, Kees Cook wrote:
> On Fri, Jan 18, 2019 at 9:44 PM kernel test robot <rong.a.chen@intel.com> wrote:
> >
> > Greeting,
> >
> > FYI, we noticed a -4.8% regression of reaim.jobs_per_min due to commit:
> >
> >
> > commit: 3047027b34b8c6404b509903058b89836093acc7 ("[PATCH 2/2] /proc/stat: Add sysctl parameter to control irq counts latency")
> > url: https://github.com/0day-ci/linux/commits/Waiman-Long/proc-stat-Reduce-irqs-counting-performance-overhead/20190108-104818
> 
> Is this expected? (And it seems like other things in the report below
> are faster? I don't understand why this particular regression was
> called out?)

No, but the sysctl has been dropped, so the point is moot.