diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-04-06 11:45:06 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-07 10:48:57 +0200 |
| commit | 339f7c90b8a2f3aa2dd4267e79f797999e8a3c59 (patch) | |
| tree | 9eaf2ff2b0d1dc66f753c74c99160a892d72a76e /kernel/perf_counter.c | |
| parent | ebb3c4c4cb81d64cc041356915ec015e2c57092a (diff) | |
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>
Diffstat (limited to 'kernel/perf_counter.c')
| -rw-r--r-- | kernel/perf_counter.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index c841563de04..19990d1f021 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -1826,6 +1826,7 @@ static void perf_counter_output(struct perf_counter *counter, } group_entry; struct perf_callchain_entry *callchain = NULL; int callchain_size = 0; + u64 time; header.type = PERF_EVENT_COUNTER_OVERFLOW; header.size = sizeof(header); @@ -1862,6 +1863,16 @@ static void perf_counter_output(struct perf_counter *counter, } } + if (record_type & PERF_RECORD_TIME) { + /* + * Maybe do better on x86 and provide cpu_clock_nmi() + */ + time = sched_clock(); + + header.type |= __PERF_EVENT_TIME; + header.size += sizeof(u64); + } + ret = perf_output_begin(&handle, counter, header.size, nmi); if (ret) return; @@ -1895,6 +1906,9 @@ static void perf_counter_output(struct perf_counter *counter, if (callchain) perf_output_copy(&handle, callchain, callchain_size); + if (record_type & PERF_RECORD_TIME) + perf_output_put(&handle, time); + perf_output_end(&handle); } |