linux-kernel - Re: question about RCU dynticks

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Date:	Wed, 06 May 2015 09:01:48 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Rik van Riel <riel@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, williams@...hat.com,
	Andrew Lutomirski <luto@...nel.org>, fweisbec@...hat.com,
	Peter Zijlstra <peterz@...radead.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: question about RCU dynticks_nesting

On Wed, 2015-05-06 at 08:52 +0200, Mike Galbraith wrote:
> On Tue, 2015-05-05 at 23:06 -0700, Paul E. McKenney wrote:
> 
> > > 100000000 * stat() on isolated cpu
> > > 
> > > NO_HZ_FULL off        inactive     housekeeper    nohz_full
> > > real    0m14.266s     0m14.367s    0m20.427s      0m27.921s 
> > > user    0m1.756s      0m1.553s     0m1.976s       0m10.447s
> > > sys     0m12.508s     0m12.769s    0m18.400s      0m17.464s
> > > (real)  1.000         1.007        1.431          1.957
> 
> 
> > Does the attached patch help at all?
> 
> nohz_full
> 0m27.073s
> 0m9.423s
> 0m17.602s
> 
> Not a complete retest, and a pull in between, but I'd say that's a no.

(well, a second is a nice "at all", just not a _huge_ "at all";)

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