Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1751958AbdH2QY0 (ORCPT <rfc822;w@1wt.eu>);
        Tue, 29 Aug 2017 12:24:26 -0400
Received: from mail-io0-f174.google.com ([209.85.223.174]:36909 "EHLO
        mail-io0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1751218AbdH2QYZ (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Tue, 29 Aug 2017 12:24:25 -0400
MIME-Version: 1.0
In-Reply-To: <bd2d09ea-47d1-c0a7-8d4d-604bb4bc28bc@linux.intel.com>
References: <83f675ad385d67760da4b99cd95ee912ca7c0b44.1503677178.git.tim.c.chen@linux.intel.com>
 <cd8ce7fbca9c126f7f928b8fa48d7a9197955b45.1503677178.git.tim.c.chen@linux.intel.com>
 <CA+55aFyErsNw8bqTOCzcrarDZBdj+Ev=1N3sV-gxtLTH03bBFQ@mail.gmail.com>
 <f10f4c25-49c0-7ef5-55c2-769c8fd9bf90@linux.intel.com> <CA+55aFzNikMsuPAaExxT1Z8MfOeU6EhSn6UPDkkz-MRqamcemg@mail.gmail.com>
 <CA+55aFx67j0u=GNRKoCWpsLRDcHdrjfVvWRS067wLUSfzstgoQ@mail.gmail.com>
 <CA+55aFzy981a8Ab+89APi6Qnb9U9xap=0A6XNc+wZsAWngWPzA@mail.gmail.com>
 <CA+55aFwyCSh1RbJ3d5AXURa4_r5OA_=ZZKQrFX0=Z1J3ZgVJ5g@mail.gmail.com>
 <CA+55aFy18WCqZGwkxH6dTZR9LD9M5nXWqEN8DBeZ4LvNo4Y0BQ@mail.gmail.com>
 <37D7C6CF3E00A74B8858931C1DB2F077537A07E9@SHSMSX103.ccr.corp.intel.com>
 <CA+55aFzotfXc07UoVtxvDpQOP8tEt8pgxeYe+cGs=BDUC_A4pA@mail.gmail.com>
 <37D7C6CF3E00A74B8858931C1DB2F077537A1C19@SHSMSX103.ccr.corp.intel.com>
 <CA+55aFwECeY-x=_du67qAxkta_0LeUw_BQA1kP337SBV3znN2Q@mail.gmail.com> <bd2d09ea-47d1-c0a7-8d4d-604bb4bc28bc@linux.intel.com>
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 29 Aug 2017 09:24:23 -0700
X-Google-Sender-Auth: KGdlMklip7x5xAEM_aMteGHDiZY
Message-ID: <CA+55aFx3WY00yvEDBg7TagX4h_-QO71=HAq5GAT8awtewRXONQ@mail.gmail.com>
Subject: Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit
To: Tim Chen <tim.c.chen@linux.intel.com>
Cc: "Liang, Kan" <kan.liang@intel.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
        Andi Kleen <ak@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Johannes Weiner <hannes@cmpxchg.org>, Jan Kara <jack@suse.cz>,
        Christopher Lameter <cl@linux.com>,
        "Eric W . Biederman" <ebiederm@xmission.com>,
        Davidlohr Bueso <dave@stgolabs.net>, linux-mm <linux-mm@kvack.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 527
Lines: 15

On Tue, Aug 29, 2017 at 9:13 AM, Tim Chen <tim.c.chen@linux.intel.com> wrote:
>
> It is affecting not a production use, but the customer's acceptance
> test for their systems.  So I suspect it is a stress test.

Can you gently poke them and ask if they might make theie stress test
code available?

Tell them that we have a fix, but right now it's delayed into 4.14
because we have no visibility into what it is that it actually fixes,
and whether it's all that critical or just some microbenchmark.

Thanks,

           Linus