[PATCH 4/5] perf_counter: PERF_RECORD_CONFIG

[Peter Zijlstra]

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

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
 include/linux/perf_counter.h |    2 ++
 kernel/perf_counter.c        |    8 ++++++++
 2 files changed, 10 insertions(+)

Index: linux-2.6/include/linux/perf_counter.h
===================================================================
--- linux-2.6.orig/include/linux/perf_counter.h
+++ linux-2.6/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
Index: linux-2.6/kernel/perf_counter.c
===================================================================
--- linux-2.6.orig/kernel/perf_counter.c
+++ linux-2.6/kernel/perf_counter.c
@@ -1992,6 +1992,11 @@ static void perf_counter_output(struct p
 		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) +
@@ -2027,6 +2032,9 @@ static void perf_counter_output(struct p
 	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.
 	 */

-- 

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