perf_counter: add PERF_RECORD_CONFIG

Much like CONFIG_RECORD_GROUP records the hw_event.config to
identify the values, allow to record this for all counters.

[ 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: <20090508170028.923228280@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 8 insertions, 0 deletions

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index f4883f1f47eb..c615f52aa408 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1994,6 +1994,11 @@ static void perf_counter_output(struct perf_counter *counter,
                 header.size += sizeof(u64);
         }
 
+        if (record_type & PERF_RECORD_CONFIG) {
+                header.type |= PERF_RECORD_CONFIG;
+                header.size += sizeof(u64);
+        }
+
         if (record_type & PERF_RECORD_GROUP) {
                 header.type |= PERF_RECORD_GROUP;
                 header.size += sizeof(u64) +
@@ -2029,6 +2034,9 @@ static void perf_counter_output(struct perf_counter *counter,
         if (record_type & PERF_RECORD_ADDR)
                 perf_output_put(&handle, addr);
 
+        if (record_type & PERF_RECORD_CONFIG)
+                perf_output_put(&handle, counter->hw_event.config);
+
         /*
          * XXX PERF_RECORD_GROUP vs inherited counters seems difficult.
          */