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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-05-08 18:52:24 +0200
committerIngo Molnar <mingo@elte.hu>2009-05-08 20:36:59 +0200
commitf370e1e2f195ec1e6420e26fc83e0319595db578 (patch)
tree08276ee556bbc91d4d5f3ccee05d930efbca77ef /kernel
parenta85f61abe11a46553c4562e74edb27ebc782aeb7 (diff)
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 <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> LKML-Reference: <20090508170029.008627711@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/perf_counter.c13
1 files changed, 13 insertions, 0 deletions
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.
*/