linux-kernel - Re: question about RCU dynticks

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Message-ID: <1430876985.3169.4.camel@gmail.com>
Date:	Wed, 06 May 2015 03:49:45 +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 Mon, 2015-05-04 at 22:54 -0700, Paul E. McKenney wrote:

> You have RCU_FAST_NO_HZ=y, correct?  Could you please try measuring with
> RCU_FAST_NO_HZ=n?

FWIW, the syscall numbers I posted were RCU_FAST_NO_HZ=n.  (I didn't
profile to see where costs lie though)

	-Mike

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