linux-kernel - Re: [PATCH 1/2] sched/wait: Break up long wake list walk

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Message-ID: <20170824204448.if2mve3iy5k425di@techsingularity.net>
Date:   Thu, 24 Aug 2017 21:44:48 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Tim Chen <tim.c.chen@...ux.intel.com>,
        "Liang, Kan" <kan.liang@...el.com>, Mel Gorman <mgorman@...e.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        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>,
        linux-mm <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] sched/wait: Break up long wake list walk

On Thu, Aug 24, 2017 at 11:16:15AM -0700, Linus Torvalds wrote:
> On Thu, Aug 24, 2017 at 10:49 AM, Tim Chen <tim.c.chen@...ux.intel.com> wrote:
> >
> > These changes look fine.  We are testing them now.
> > Does the second patch in the series look okay to you?
> 
> I didn't really have any reaction to that one, as long as Mel&co are
> ok with it, I'm fine with it.
> 

I've no strong objections or concerns. I'm disappointed that the
original root cause for this could not be found but hope that eventually a
reproducible test case will eventually be available. Despite having access
to a 4-socket box, I was still unable to create a workload that caused
large delays on wakeup. I'm going to have to stop as I don't think it's
possible to create on that particular machine for whatever reason.

-- 
Mel Gorman
SUSE Labs