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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 26 Oct 2016 11:10:53 -0700
Message-ID: <CA+55aFzVmppmua4U0pesp2moz7vVPbH1NP264EKeW3YqOzFc3A@mail.gmail.com>
Subject: Re: CONFIG_VMAP_STACK, on-stack struct, and wake_up_bit
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Sender: owner-linux-mm@kvack.org
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To: Bob Peterson <rpeterso@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>, Andreas Gruenbacher <agruenba@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Andy Lutomirski <luto@kernel.org>, LKML <linux-kernel@vger.kernel.org>, Steven Whitehouse <swhiteho@redhat.com>, Mel Gorman <mgorman@techsingularity.net>, linux-mm <linux-mm@kvack.org>

On Wed, Oct 26, 2016 at 11:04 AM, Bob Peterson <rpeterso@redhat.com> wrote:
>
> I can test it for you, if you give me about an hour.

I can definitely wait an hour, it would be lovely to see more testing.
Especially if you have a NUMA machine and an interesting workload.

And if you actually have that NUMA machine and a load that shows the
page_waietutu effects, it would also be lovely if you can then
_additionally_ test the patch that PeterZ wrote a few weeks ago, it
was on the mm list about a month ago:

  Date: Thu, 29 Sep 2016 15:08:27 +0200
  From: Peter Zijlstra <peterz@infradead.org>
  Subject: Re: page_waitqueue() considered harmful
  Message-ID: <20160929130827.GX5016@twins.programming.kicks-ass.net>

and if you don't find it I can forward it to you (Peter had a few
versions, that latest one is the one that looked best).

                Linus

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