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

[Stephen Rothwell]

Hi Frederic,

On Fri, 8 Feb 2013 14:07:49 +1100 Stephen Rothwell <sfr at canb.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 at canb.auug.org.au
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