linux-kernel - Re: [PATCH 3/3] ARM: Kconfig: allow virt CPU accounting

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Message-ID: <877gg5szoz.fsf@linaro.org>
Date:	Thu, 01 Aug 2013 17:29:00 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Russell King <rmk+kernel@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 3/3] ARM: Kconfig: allow virt CPU accounting

Frederic Weisbecker <fweisbec@...il.com> writes:

> On Wed, Jul 03, 2013 at 11:36:41AM -0700, Kevin Hilman wrote:
>> With the 64-bit requirement removed from virt CPU accounting,
>> allow ARM platforms to enable it.
>> 
>> Cc: Russell King <rmk+kernel@....linux.org.uk>
>> Signed-off-by: Kevin Hilman <khilman@...aro.org>
>> ---
>>  arch/arm/Kconfig | 1 +
>>  1 file changed, 1 insertion(+)
>> 
>> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
>> index 136f263..7850612 100644
>> --- a/arch/arm/Kconfig
>> +++ b/arch/arm/Kconfig
>> @@ -61,6 +61,7 @@ config ARM
>>  	select OLD_SIGSUSPEND3
>>  	select OLD_SIGACTION
>>  	select HAVE_CONTEXT_TRACKING
>> +	select HAVE_VIRT_CPU_ACCOUNTING
>
> I think you got confused here. HAVE_VIRT_CPU_ACCOUNTING is the arch capability
> for VIRT_CPU_ACCOUNTING_NATIVE, not for VIRT_CPU_ACCOUNTING_GEN that only requires
> support for context tracking.

Yes, I am confused. :/

> That's my bad, all those names start to be confusing now.
> The VIRT based Kconfig naming is a bit weird, that doesn't really reflect what the feature
> is doing. "Virtual cputime accounting" just doesn't give any clue, except perhaps suggesting
> the stuff deals with virtualization while it actually has nothing to do with.
> I don't even know what virtual refers to here.
>
> Same goes for vtime based APIs. In fact I just based my work on the legacy that was
> there and expanded further the non-sense ;-)
>
> I'll need to do a big renaming one day.
>
> But to begin with I should rename s/HAVE_VIRT_CPU_ACCOUNTING/HAVE_VIRT_CPU_ACCOUNTING_NATIVE.

OK, I just tested and I can indeed drop this patch.

Thanks for clarifying,

Kevin

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