linux-kernel - Re: [PATCH] oprofile: Allow setting EDGE/INV/CMASK for Intel counter events

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Message-ID: <20110316152757.GA12845@tassilo.jf.intel.com>
Date:	Wed, 16 Mar 2011 08:27:57 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Robert Richter <robert.richter@....com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"oprofile-list@...ts.sf.net" <oprofile-list@...ts.sf.net>
Subject: Re: [PATCH] oprofile: Allow setting EDGE/INV/CMASK for Intel counter
 events

> I would like to write the actual value back so that userland may read
> it:
> 
> 	counter_config->extra &= (ARCH_PERFMON_EVENTSEL_INV|
>                          ARCH_PERFMON_EVENTSEL_EDGE|
>                          ARCH_PERFMON_EVENTSEL_CMASK);
> 	val |= counter_config->extra;
> 
> The value will not be updated emmediately but at least after profiling
> was started.

Okay.

> 
> As an alternative, maybe we better put this extra bits in the
> unit_mask, e.g. in bits [31:16] of the unit mask for bits [31:16] of
> PerfEvtSel? Then, we simply could use the current userland to set it
> up.

We can't anyways, it doesn't support it.

-Andi


-- 
ak@...ux.intel.com -- Speaking for myself only
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