From f370e1e2f195ec1e6420e26fc83e0319595db578 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 8 May 2009 18:52:24 +0200 Subject: perf_counter: add PERF_RECORD_CPU Allow recording the CPU number the event was generated on. RFC: this leaves a u32 as reserved, should we fill in the node_id() there, or leave this open for future extention, as userspace can already easily do the cpu->node mapping if needed. [ Impact: extend perfcounter output record format ] Signed-off-by: Peter Zijlstra Cc: Paul Mackerras Cc: Corey Ashford LKML-Reference: <20090508170029.008627711@chello.nl> Signed-off-by: Ingo Molnar --- kernel/perf_counter.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'kernel') diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index c615f52aa40..d850a1fb8d4 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -1956,6 +1956,9 @@ static void perf_counter_output(struct perf_counter *counter, struct perf_callchain_entry *callchain = NULL; int callchain_size = 0; u64 time; + struct { + u32 cpu, reserved; + } cpu_entry; header.type = 0; header.size = sizeof(header); @@ -1999,6 +2002,13 @@ static void perf_counter_output(struct perf_counter *counter, header.size += sizeof(u64); } + if (record_type & PERF_RECORD_CPU) { + header.type |= PERF_RECORD_CPU; + header.size += sizeof(cpu_entry); + + cpu_entry.cpu = raw_smp_processor_id(); + } + if (record_type & PERF_RECORD_GROUP) { header.type |= PERF_RECORD_GROUP; header.size += sizeof(u64) + @@ -2037,6 +2047,9 @@ static void perf_counter_output(struct perf_counter *counter, if (record_type & PERF_RECORD_CONFIG) perf_output_put(&handle, counter->hw_event.config); + if (record_type & PERF_RECORD_CPU) + perf_output_put(&handle, cpu_entry); + /* * XXX PERF_RECORD_GROUP vs inherited counters seems difficult. */ -- cgit