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Subject: Re: [PATCH 1/2] sched/wait: Break up long wake list walk
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From: Tim Chen <tim.c.chen@linux.intel.com>
Message-ID: <63454831-3259-c758-d164-3b2ff2a04b7e@linux.intel.com>
Date: Fri, 25 Aug 2017 09:44:06 -0700
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To: Mel Gorman <mgorman@techsingularity.net>, Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Liang, Kan" <kan.liang@intel.com>, Mel Gorman <mgorman@suse.de>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, 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>, linux-mm <linux-mm@kvack.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

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@linux.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

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