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

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Message-ID: <CA+55aFwgZ6rUL2-KD7A38xEkALJcvk8foT2TBjLrvy8caj7k9w@mail.gmail.com>
Date:   Wed, 26 Oct 2016 15:09:41 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
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>,
        Bob Peterson <rpeterso@...hat.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: CONFIG_VMAP_STACK, on-stack struct, and wake_up_bit

On Wed, Oct 26, 2016 at 3:03 PM, Mel Gorman <mgorman@...hsingularity.net> wrote:
>
> To be clear, are you referring to PeterZ's patch that avoids the lookup? If
> so, I see your point.

Yup, that's the one. I think you tested it. In fact, I'm sure you did,
because I remember seeing performance numbers from  you ;)

So yes, I'd expect my patch on its own to quite possibly regress on
NUMA systems (although I wonder how much), but I consider PeterZ's
patch the fix to that, so I wouldn't worry about it.

              Linus