linux-kernel - Re: [PATCH 4/8] cputime: Generic on-demand virtual cputime accounting

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Message-Id: <20130208141447.03914013db9a5f7308fc1675@canb.auug.org.au>
Date:	Fri, 8 Feb 2013 14:14:47 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung.kim@....com>,
	"Paul E. McKenney" <paulmck@...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>,
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 4/8] cputime: Generic on-demand virtual cputime
 accounting

Hi Frederic,

On Fri, 8 Feb 2013 14:07:49 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> This patch has the side effect of changing the default configurations:
> (This is PowerPC pseries_defconfig before/after this patch)
> 
> @@ -119,8 +120,8 @@
>  #
>  # CPU/Task time and stats accounting
>  #
> -# CONFIG_TICK_CPU_ACCOUNTING is not set
> -CONFIG_VIRT_CPU_ACCOUNTING=y
> +CONFIG_TICK_CPU_ACCOUNTING=y
> +# CONFIG_VIRT_CPU_ACCOUNTING_NATIVE is not set
>  # CONFIG_BSD_PROCESS_ACCT is not set
>  CONFIG_TASKSTATS=y
>  CONFIG_TASK_DELAY_ACCT=y
> 
> I don't know if that was deliberate, but it was suprising.  I noticed
> when this patch entered next-20130207.

I suspect that this is caused by the changes to init/Kconfig:

diff --git a/init/Kconfig b/init/Kconfig
index be8b7f5..a05f843 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -326,6 +326,9 @@ source "kernel/time/Kconfig"
 
 menu "CPU/Task time and stats accounting"
 
+config VIRT_CPU_ACCOUNTING
+	bool
+
 choice
 	prompt "Cputime accounting"
 	default TICK_CPU_ACCOUNTING if !PPC64

The next line of context is:

        default VIRT_CPU_ACCOUNTING if PPC64

Which may have needed changing as well?  Indeed, changing that to
VIRT_CPU_ACCOUNTING_NATIVE restores the old defaults.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

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