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>

2 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 88f863ec2748..0e6303d36c66 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -104,6 +104,7 @@ enum perf_counter_record_format {
         PERF_RECORD_ADDR        = 1U << 3,
         PERF_RECORD_GROUP       = 1U << 4,
         PERF_RECORD_CALLCHAIN   = 1U << 5,
+        PERF_RECORD_CONFIG      = 1U << 6,
 };
 
 /*
@@ -258,6 +259,7 @@ enum perf_event_type {
          *      { u32                   pid, tid; } && PERF_RECORD_TID
          *      { u64                   time;     } && PERF_RECORD_TIME
          *      { u64                   addr;     } && PERF_RECORD_ADDR
+         *      { u64                   config;   } && PERF_RECORD_CONFIG
          *
          *      { u64                   nr;
          *        { u64 event, val; }   cnt[nr];  } && PERF_RECORD_GROUP
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.
          */