perf stat: Change metrics context calculation

Changing metrics context calculation to allow more than 2 types of
context.

Following patches will add support for the rest of the exclude_* bits so
we need separate array element for all context combinations.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: William Cohen <wcohen@redhat.com>
Link: http://lkml.kernel.org/r/1428441919-23099-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-stat.c

@@ -247,9 +247,13 @@ static int perf_evlist__alloc_stats(struct perf_evlist *evlist, bool alloc_raw)
 	return -1;
 }
 
-#define NUM_CTX 3
+enum {
+	CTX_BIT_USER	= 1 << 0,
+	CTX_BIT_KERNEL	= 1 << 1,
+	CTX_BIT_MAX	= 1 << 2,
+};
 
-enum { CTX_USER, CTX_KERNEL, CTX_ALL };
+#define NUM_CTX CTX_BIT_MAX
 
 static struct stats runtime_nsecs_stats[MAX_NR_CPUS];
 static struct stats runtime_cycles_stats[NUM_CTX][MAX_NR_CPUS];
@@ -269,12 +273,13 @@ static struct stats runtime_elision_stats[NUM_CTX][MAX_NR_CPUS];
 
 static int evsel_context(struct perf_evsel *evsel)
 {
+	int ctx = 0;
+
 	if (evsel->attr.exclude_kernel)
-		return CTX_USER;
+		ctx |= CTX_BIT_KERNEL;
 	if (evsel->attr.exclude_user)
-		return CTX_KERNEL;
-	/* Handle hypervisor too? */
-	return CTX_ALL;
+		ctx |= CTX_BIT_USER;
+	return ctx;
 }
 
 static void perf_stat__reset_stats(struct perf_evlist *evlist)