linux-kernel - Re: [PATCH 1/2] nohz: Select VIRT_CPU_ACCOUNTING

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Message-ID: <20130426162214.GB30716@somewhere>
Date:	Fri, 26 Apr 2013 18:22:15 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Kevin Hilman <khilman@...aro.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/2] nohz: Select VIRT_CPU_ACCOUNTING_GEN from full
 dynticks config

On Fri, Apr 26, 2013 at 08:39:56AM -0700, Paul E. McKenney wrote:
> >  config VIRT_CPU_ACCOUNTING_GEN
> >  	bool "Full dynticks CPU time accounting"
> > -	depends on HAVE_CONTEXT_TRACKING && 64BIT
> > +	depends on HAVE_CONTEXT_TRACKING && 64BIT && NO_HZ_FULL
> 
> Do you really want this change?  This prohibits VIRT_CPU_ACCOUNTING_GEN
> unless NO_HZ_FULL, which means that it can no longer be used in situations
> where it used to be usable.  My guess is that you want to leave this
> particular line as it was.

Hmm, this can make sense. This can be used to perform comparisons between
tick-based and tickless cputime accounting easily.

I'll respin.
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