Received: by 2002:a25:1506:0:0:0:0:0 with SMTP id 6csp247964ybv;
        Wed, 5 Feb 2020 04:59:43 -0800 (PST)
X-Google-Smtp-Source: APXvYqxVLOoi9+WWtS0CIORuvgml0YwOewlleXnLq0w2u9WMyjKiLG5EbuXI2rOKFaNMFgRxxvv0
X-Received: by 2002:aca:b1d5:: with SMTP id a204mr2650652oif.82.1580907583519;
        Wed, 05 Feb 2020 04:59:43 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1580907583; cv=none;
        d=google.com; s=arc-20160816;
        b=gTmrHwB2iMzTnq2+SxbNq0dhNDW7cSM49bCoiRiTIPqAKrQl3UB5rZozlaN6gzdNRD
         a3XrbVKaza2bPasIAM7+lEvZlnee2JYG05R38uIfC9HRqZtNsYdzeTSRYcwwY96CmQJm
         kKEqoYO27jXxZDlFvF87qXT9AI+tvBJzbNTV7+pcwUQ5gHEGmL7ZUNexsB49vYR+EfNF
         Q9Yc8aaNLuvZcxd+7soWdUjGOKtRl5dG1pc5i0gK8H8ia123thkq1gNm1NfP8bAFAkEd
         ZUQlbCSeWUxapEXryaqH7jza5uF+53TlN40d0AHcNUfuBqQqVwxOSnAPzgdODKQteohJ
         cYIA==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=list-id:precedence:sender:user-agent:in-reply-to
         :content-disposition:mime-version:references:message-id:subject:cc
         :to:from:date:dkim-signature;
        bh=dlZ2JXatY1iOQhXGUdRNEAvuT1KiYZNZnQJyohz4mds=;
        b=Vw4PBP1uVgr4ELAJu252kSrIDblt7HzHjJvJUKsp5hYbM7+8JP6b8FEtf3YhRcnSo5
         38Xnr6C4UNRR7pfLb5i37y2tQy6+k6WsKY4zifxKZwu5boVRC/EzIy06Pjgq/dkDXHqg
         EQ5JZ08dzJH256yubhlSBn3nCyyDPPIxgRkIpOyOxmOPvnzajOfC5K6JlCxtBuif/ZW1
         P5qKHwuINMWYJu6JoDpMciIaEdBgeEul+o0yiFTzNwtSNEePLjhwBNHgGbJk/j3BsB0g
         UKWi/R+MYZAHkUZjl/UNdzbOV4Hra4aG4D/wuSmWWLy4mgGn8uMbhHbGbXEAvmS9RriO
         +HDg==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=fail header.i=@infradead.org header.s=merlin.20170209 header.b=KpvCmxsD;
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67])
        by mx.google.com with ESMTP id 2si11064993ois.221.2020.02.05.04.59.31;
        Wed, 05 Feb 2020 04:59:43 -0800 (PST)
Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Authentication-Results: mx.google.com;
       dkim=fail header.i=@infradead.org header.s=merlin.20170209 header.b=KpvCmxsD;
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1727458AbgBEM6X (ORCPT <rfc822;zeqiangyin@gmail.com>
        + 99 others); Wed, 5 Feb 2020 07:58:23 -0500
Received: from merlin.infradead.org ([205.233.59.134]:39252 "EHLO
        merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1726386AbgBEM6X (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 5 Feb 2020 07:58:23 -0500
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
        d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version:
        References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To:
        Content-Transfer-Encoding:Content-ID:Content-Description;
        bh=dlZ2JXatY1iOQhXGUdRNEAvuT1KiYZNZnQJyohz4mds=; b=KpvCmxsD8VwVPC0iBV9NgtM+6F
        fwehJCBoNIRQY0xVYWuM1KCZaWDc9q3fHiHje/Iup7/vLepWq/Cfs+3jolQVOKqC59K9MXgRIZRm/
        5mjWN48c3Y7mYqffxqXzGeNF/O2PHbB7Bvvaix8vzUjRaAg4VTPP/O4p+dGkx+/1+c1GU2oIqFH2g
        qorkjk7JErvAT8jux4la0PhUI6j77BDELRv+SwoKqZEDngvcxRUMprGCstCovCeDbI6MuUMiL8rFw
        25U9wdEU+09IetjLHUbrvAOK3E5NfF/Rw/PeHFpijo5EHS399y8XmipZ4dq0MnwPmaghBeLoyymw+
        pX+NYlXA==;
Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net)
        by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux))
        id 1izKFr-0002fZ-Vu; Wed, 05 Feb 2020 12:58:08 +0000
Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225])
        (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
        (Client did not present a certificate)
        by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 0DA7F3016E5;
        Wed,  5 Feb 2020 13:56:19 +0100 (CET)
Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000)
        id 0702A2B77760E; Wed,  5 Feb 2020 13:58:05 +0100 (CET)
Date:   Wed, 5 Feb 2020 13:58:04 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     kernel test robot <rong.a.chen@intel.com>
Cc:     Jiri Olsa <jolsa@redhat.com>, Ingo Molnar <mingo@kernel.org>,
        Vince Weaver <vincent.weaver@maine.edu>,
        Jiri Olsa <jolsa@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@linux.ibm.com>,
        Stephane Eranian <eranian@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>, lkp@lists.01.org
Subject: Re: [perf/x86] 81ec3f3c4c: will-it-scale.per_process_ops -5.5%
 regression
Message-ID: <20200205125804.GM14879@hirez.programming.kicks-ass.net>
References: <20200205123216.GO12867@shao2-debian>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200205123216.GO12867@shao2-debian>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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.