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

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Message-ID: <1536202752.13054466.1477509102622.JavaMail.zimbra@redhat.com>
Date:   Wed, 26 Oct 2016 15:11:42 -0400 (EDT)
From:   Bob Peterson <rpeterso@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
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

----- Original Message -----
| 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.

Sorry. I guess I underestimated the time it takes to build a kernel
on my test box. It will take a little longer, but it's compiling now.

| 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.

I'll see what I can cook up.

| 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).

I'll see what I can do, but first I'll check basic functionality
and report back.

Bob Peterson