perf_counter: PERF_RECORD_TIME
By popular request, provide means to log a timestamp along with the counter overflow event. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> LKML-Reference: <20090406094518.024173282@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -102,6 +102,7 @@ enum perf_counter_record_format {
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PERF_RECORD_TID = 1U << 1,
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PERF_RECORD_GROUP = 1U << 2,
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PERF_RECORD_CALLCHAIN = 1U << 3,
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PERF_RECORD_TIME = 1U << 4,
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};
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/*
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@ -221,6 +222,7 @@ enum perf_event_type {
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__PERF_EVENT_TID = PERF_RECORD_TID,
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__PERF_EVENT_GROUP = PERF_RECORD_GROUP,
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__PERF_EVENT_CALLCHAIN = PERF_RECORD_CALLCHAIN,
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__PERF_EVENT_TIME = PERF_RECORD_TIME,
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};
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#ifdef __KERNEL__
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@ -1826,6 +1826,7 @@ static void perf_counter_output(struct perf_counter *counter,
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} group_entry;
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struct perf_callchain_entry *callchain = NULL;
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int callchain_size = 0;
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u64 time;
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header.type = PERF_EVENT_COUNTER_OVERFLOW;
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header.size = sizeof(header);
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@ -1862,6 +1863,16 @@ static void perf_counter_output(struct perf_counter *counter,
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}
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}
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if (record_type & PERF_RECORD_TIME) {
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/*
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* Maybe do better on x86 and provide cpu_clock_nmi()
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*/
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time = sched_clock();
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header.type |= __PERF_EVENT_TIME;
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header.size += sizeof(u64);
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}
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ret = perf_output_begin(&handle, counter, header.size, nmi);
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if (ret)
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return;
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@ -1895,6 +1906,9 @@ static void perf_counter_output(struct perf_counter *counter,
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if (callchain)
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perf_output_copy(&handle, callchain, callchain_size);
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if (record_type & PERF_RECORD_TIME)
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perf_output_put(&handle, time);
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perf_output_end(&handle);
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}
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