linux-kernel - Re: CONFIG_VMAP_STACK, on-stack struct, and wake_up

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

On Wed, Oct 26, 2016 at 11:04 AM, Bob Peterson <rpeterso@...hat.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@...radead.org>
  Subject: Re: page_waitqueue() considered harmful
  Message-ID: <20160929130827.GX5016@...ns.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