Re: [PATCH] oprofile: Allow setting EDGE/INV/CMASK for Intelcounter events
From: Robert Richter
Date: Wed Mar 16 2011 - 11:46:12 EST
On 16.03.11 11:27:57, Andi Kleen wrote:
> > 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.
> > 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.
Shouldn't something like the follwing work (assuming the umask table
opcontrol --event SOME_EVENT:100000:0x00800000 ...
(setting the INV flag)
Advanced Micro Devices, Inc.
Operating System Research Center
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