Messages in this thread | | | Subject | Re: [patch] perf_counter: Add p6 PMU | From | Peter Zijlstra <> | Date | Thu, 09 Jul 2009 00:14:24 +0200 |
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On Wed, 2009-07-08 at 23:45 +0200, Peter Zijlstra wrote: > On Wed, 2009-07-08 at 17:46 -0400, Vince Weaver wrote: > > On Wed, 8 Jul 2009, Peter Zijlstra wrote: > > > > > doesn't sound like the right kind of event.. but then, it doesn't > > > have anything better either. > > > > Is there a way to specify "invalid event"? Just setting it to 0 doesn't > > work, on the Pentium Pro event 0 returns what looks like essentially > > random numbers. > > Hmm, bugger. I was assuming writing 0 to the evensel would disable the > counter. Apparently that only works for eventsel1, which would mean we > cannot run counter1 without counter0. That means we'd need to do a > counter swap at times... :/
Ooh, we can instead use a counter that's specified to not count anything for 'disabling' the counter, like event 0x2E with unit mask 0.
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