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

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Date:	Fri, 8 Feb 2013 15:31:55 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
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

2013/2/8 Stephen Rothwell <sfr@...b.auug.org.au>:
> 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.

Indeed, thanks for your fix!
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