Messages in this thread | | | Date | Sun, 12 Feb 2012 12:37:30 -0600 | Subject | Question about resetting a sampling counter in kernel | From | heechul Yun <> |
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Hello,
I have a question about controlling performance counter in kernel.
I created a kernel counter which generates an interrupt at every 10000 cache-misses as shown below.
struct perf_event_attr sched_perf_hw_attr = { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES, .sample_period = 10000, .size = sizeof(struct perf_event_attr), .pinned = 1, .disbled = 1, }
event = perf_event_create_kernel_counter(&sched_perf_hw_attr, cpu, NULL, event_overflow_callback, NULL);
What I would like to do is to "reset" the counter before the overflow interrupt occurs (e.g, reset at 5000th event), and then to restart the sampling from 0.
I found perf_event_enable() and perf_event_disable() only start/stop the counting but couln't figure out how to reset the sampling as I described above.
I would be really thankful if you explain how I can efficiently reset the sampling counter.
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