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>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 0e6303d36c66..614f921d616a 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -105,6 +105,7 @@ enum perf_counter_record_format {
         PERF_RECORD_GROUP       = 1U << 4,
         PERF_RECORD_CALLCHAIN   = 1U << 5,
         PERF_RECORD_CONFIG      = 1U << 6,
+        PERF_RECORD_CPU         = 1U << 7,
 };
 
 /*
@@ -260,6 +261,7 @@ enum perf_event_type {
          *      { u64                   time;     } && PERF_RECORD_TIME
          *      { u64                   addr;     } && PERF_RECORD_ADDR
          *      { u64                   config;   } && PERF_RECORD_CONFIG
+         *      { u32                   cpu, res; } && PERF_RECORD_CPU
          *
          *      { u64                   nr;
          *        { u64 event, val; }   cnt[nr];  } && PERF_RECORD_GROUP