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>

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 88f863e..0e6303d 100644 (file)
--- 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 f4883f1..c615f52 100644 (file)
--- 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.
         */