From: Mel Gorman <mgorman@techsingularity.net>
To: Linus Torvalds <torvalds@linux-foundation.org>
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>,
Bob Peterson <rpeterso@redhat.com>,
Steven Whitehouse <swhiteho@redhat.com>,
linux-mm <linux-mm@kvack.org>
Subject: Re: CONFIG_VMAP_STACK, on-stack struct, and wake_up_bit
Date: Thu, 27 Oct 2016 00:07:26 +0100 [thread overview]
Message-ID: <20161026230726.GF2699@techsingularity.net> (raw)
In-Reply-To: <CA+55aFwgZ6rUL2-KD7A38xEkALJcvk8foT2TBjLrvy8caj7k9w@mail.gmail.com>
On Wed, Oct 26, 2016 at 03:09:41PM -0700, Linus Torvalds wrote:
> On Wed, Oct 26, 2016 at 3:03 PM, Mel Gorman <mgorman@techsingularity.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 ;)
>
Yeah and the figures were fine. IIRC, 32-bit support was the main thing
that was missing but who cares, 32-bit is not going to have the NUMA issues
in any way that matters.
> So yes, I'd expect my patch on its own to quite possibly regress on
> NUMA systems (although I wonder how much),
I doubt it's a lot. Even if it does, it's doesn't matter because it's a
functional fix.
> but I consider PeterZ's
> patch the fix to that, so I wouldn't worry about it.
>
Agreed. Peter, do you plan to finish that patch?
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2016-10-26 23:07 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-26 12:51 CONFIG_VMAP_STACK, on-stack struct, and wake_up_bit Andreas Gruenbacher
2016-10-26 15:51 ` Andy Lutomirski
2016-10-26 16:32 ` Linus Torvalds
2016-10-26 17:15 ` Linus Torvalds
2016-10-26 17:58 ` Linus Torvalds
2016-10-26 18:04 ` Bob Peterson
2016-10-26 18:10 ` Linus Torvalds
2016-10-26 19:11 ` Bob Peterson
2016-10-26 21:01 ` Bob Peterson
2016-10-26 21:30 ` Linus Torvalds
2016-10-26 22:45 ` Borislav Petkov
2016-10-26 23:13 ` Borislav Petkov
2016-10-27 0:37 ` Bob Peterson
2016-10-27 12:36 ` Borislav Petkov
2016-10-27 18:51 ` Bob Peterson
2016-10-27 19:19 ` Borislav Petkov
2016-10-27 21:03 ` Bob Peterson
2016-10-27 21:19 ` Borislav Petkov
2016-10-28 8:37 ` [tip:x86/urgent] x86/microcode/AMD: Fix more fallout from CONFIG_RANDOMIZE_MEMORY=y tip-bot for Borislav Petkov
2016-10-26 20:31 ` CONFIG_VMAP_STACK, on-stack struct, and wake_up_bit Mel Gorman
2016-10-26 21:26 ` Linus Torvalds
2016-10-26 22:03 ` Mel Gorman
2016-10-26 22:09 ` Linus Torvalds
2016-10-26 23:07 ` Mel Gorman [this message]
2016-10-27 8:08 ` Peter Zijlstra
2016-10-27 9:07 ` Mel Gorman
2016-10-27 9:44 ` Peter Zijlstra
2016-10-27 9:59 ` Mel Gorman
2016-10-27 11:56 ` Nicholas Piggin
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