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

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Message-Id: <1242294664.6642.1000.camel@laptop>
Date:	Thu, 14 May 2009 11:51:04 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Mackerras <paulus@...ba.org>
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

On Thu, 2009-05-14 at 19:47 +1000, Paul Mackerras wrote:
> 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)

Yep, that reads nicer :-)



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