linux-kernel - Re: [PATCH] futex: Ensure get_futex_key

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Message-ID: <1413648929.5367.25.camel@marge.simpson.net>
Date:	Sat, 18 Oct 2014 18:15:29 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Matteo Franchin <Matteo.Franchin@....com>,
	Davidlohr Bueso <davidlohr@...com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] futex: Ensure get_futex_key_refs() always implies a
 barrier

On Sat, 2014-10-18 at 08:28 -0700, Linus Torvalds wrote: 
> On Fri, Oct 17, 2014 at 11:54 PM, Mike Galbraith
> <umgwanakikbuti@...il.com> wrote:
> >
> > The barrier fixing up my problematic box smells a lot like evidence.
> 
> Is this a "tested-by"? Did you actuallyu verify that the patch ends up
> fixing the problem you saw?

Yup, it definitely fixed it up.

Weird that it didn't show at all on the 2 socket 20 core box the problem
I was looking into was reported on, but was 100% busted on the similar 2
socket 28 core box I borrowed to have a peek, and only that box.  My
(crippled/slow) 64 core DL980 was perfectly happy, as were my 3 home
boxen, not a peep from anywhere but that one 28 core box.

Hohum..  Tested-by: Mike Galbraith <umgwanakikbuti@...il.com>

-Mike

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