Messages in this thread | | | Date | Thu, 11 Dec 2008 11:11:00 -0800 | From | "Tony Luck" <> | Subject | Re: [patch] Performance Counters for Linux, v3 |
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> /* > * Special "software" counters provided by the kernel, even if > * the hardware does not support performance counters. These > * counters measure various physical and sw events of the > * kernel (and allow the profiling of them as well): > */ > PERF_COUNT_CPU_CLOCK = -1, > PERF_COUNT_TASK_CLOCK = -2, > /* > * Future software events: > */ > /* PERF_COUNT_PAGE_FAULTS = -3, > PERF_COUNT_CONTEXT_SWITCHES = -4, */
... > +[ Note: more hw_event_types are supported as well, but they are CPU > + specific and are enumerated via /sys on a per CPU basis. Raw hw event > + types can be passed in as negative numbers. For example, to count > + "External bus cycles while bus lock signal asserted" events on Intel > + Core CPUs, pass in a -0x4064 event type value. ]
It looks like you have an overlap here. You are using some negative numbers to denote your special software events, but also as "raw" hardware events. What if these conflict?
-Tony
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