linux-kernel - Re: [PATCH 2/3] PERF(kernel): Cleanup power events

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Date:	Fri, 12 Nov 2010 22:50:21 +0100
From:	Jean Pihet <jean.pihet@...oldbits.com>
To:	Thomas Renninger <trenn@...e.de>
Cc:	mingo@...e.hu, rjw@...k.pl, linux-kernel@...r.kernel.org,
	arjan@...ux.intel.com
Subject: Re: [PATCH 2/3] PERF(kernel): Cleanup power events

On Fri, Nov 12, 2010 at 7:17 PM, Thomas Renninger <trenn@...e.de> wrote:
> On Friday 12 November 2010 08:20:47 am Jean Pihet wrote:
>> Thomas,
> ...
>> > +
>> > +       TP_printk("state=%lu cpu_id=%lu", (unsigned long)__entry->state,
>> > +                 (unsigned long)__entry->cpu_id)
>> Using %lu for the state field causes PWR_EVENT_EXIT to appear as
>> 4294967295 instead of -1. Can the field be of a signed type?
> This is intended, what exactly is the problem?
There is no problem, I just wanted to warn about it. I am fine with it.

>
> ...
>> > +       TP_printk("state=%lu", (unsigned long)__entry->state)
>> Same remark about the unsigned type for the state field.
> Same.
>>
>> > +);
>> > +
>> > +#ifdef CONFIG_EVENT_POWER_TRACING_DEPRECATED
>> > +
>> >  #ifndef _TRACE_POWER_ENUM_
>> >  #define _TRACE_POWER_ENUM_
>> >  enum {
>> > @@ -153,8 +214,32 @@ DEFINE_EVENT(power_domain, power_domain_target,
>> >
>> >        TP_ARGS(name, state, cpu_id)
>> >  );
>> > -
>> > +#endif /* CONFIG_EVENT_POWER_TRACING_DEPRECATED */
>> The clock and power_domain events have been recently introduced and so
>> must be part of the new API. Can this #endif be moved right after the
>> definition of power_end?
> Oops, I pulled again meanwhile and the patches still patched without fuzz,
> but probably with some offset.
> I'll look at that and resend this one.
Ok

>
>> >  #endif /* _TRACE_POWER_H */
>> Should this be at the very end of the file?
> Not sure whether this also came from merge issues, but yes, several
> #ifdef conditions need to get corrected.
Ok

>
> ...
>
>> A string is needed here. Without it it is impossible to have the option
>> unset.
>> This does the trick: +bool "Deprecated power event trace API, to be removed"
> Ok, thanks.
>
> I am currently rebuilding on several archs/flavors and hope to be able
> to re-send this one today or on Tue.
>
> Thanks,
>
>    Thomas
>
Thanks!

Jean
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