linux-kernel - Re: [PATCH 2/3] perf_counter: allow arch to supply event misc flags and instruction pointer

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Message-ID: <18955.59546.713452.302649@cargo.ozlabs.ibm.com>
Date:	Thu, 14 May 2009 19:47:06 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/3] perf_counter: allow arch to supply event misc
 flags and instruction pointer

Peter Zijlstra writes:

> On Thu, 2009-05-14 at 13:29 +1000, Paul Mackerras wrote:

> >  #define PERF_EVENT_MISC_KERNEL		(1 << 0)
> >  #define PERF_EVENT_MISC_USER		(1 << 1)
> >  #define PERF_EVENT_MISC_OVERFLOW	(1 << 2)
> > +#define PERF_EVENT_MISC_HYPERVISOR	(1 << 3)
> 
> Ah, I think I've taught userspace that either !USER && !KERNEL or USER
> && KERNEL is HV information, since neither really makes sense :-)

OK, should we do something like this?

#define PERF_EVENT_MISC_CPUMODE_MASK	(3 << 0)
#define PERF_EVENT_MISC_CPUMODE_UNKNOWN	(0 << 0)
#define PERF_EVENT_MISC_USER		(1 << 0)
#define PERF_EVENT_MISC_KERNEL		(2 << 0)
#define PERF_EVENT_MISC_HYPERVISOR	(3 << 0)

Paul.
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