linux-kernel - Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page

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Date:   Tue, 29 Aug 2017 09:24:23 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     "Liang, Kan" <kan.liang@...el.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>,
        Christopher Lameter <cl@...ux.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        linux-mm <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2 v2] sched/wait: Introduce lock breaker in wake_up_page_bit

On Tue, Aug 29, 2017 at 9:13 AM, Tim Chen <tim.c.chen@...ux.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