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

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Message-ID: <63454831-3259-c758-d164-3b2ff2a04b7e@linux.intel.com>
Date:   Fri, 25 Aug 2017 09:44:06 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Mel Gorman <mgorman@...hsingularity.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "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 08/24/2017 01:44 PM, Mel Gorman wrote:
> 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.
> 

Kan helped to test the updated patch 1 from Linus.  It worked fine.
I've refreshed the patch set that includes all the changes
and send a version 2 refresh of the patch set separately.

Thanks.

Tim