[PATCH 7/7] perf, tools, stat: Check for frontend stalled for metrics

[Andi Kleen]

From: Andi Kleen <a...@linux.intel.com>

Add an extra check for frontend stalled in the metrics.
This avoids an extra column for the --metric-only case
when the CPU does not support frontend stalled.

v2: Add separate init function
Acked-by: Jiri Olsa <jo...@kernel.org>
Signed-off-by: Andi Kleen <a...@linux.intel.com>
---
 tools/perf/builtin-stat.c     | 1 +
 tools/perf/util/stat-shadow.c | 9 ++++++++-
 tools/perf/util/stat.h        | 1 +
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 42975ae..7692b17 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -2179,6 +2179,7 @@ int cmd_stat(int argc, const char **argv, const char 
*prefix __maybe_unused)
        argc = parse_options_subcommand(argc, argv, stat_options, 
stat_subcommands,
                                        (const char **) stat_usage,
                                        PARSE_OPT_STOP_AT_NON_OPTION);
+       perf_stat__init_shadow_stats();
 
        if (csv_sep) {
                csv_output = true;
diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 5e2d2e3..b33ffb2 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -2,6 +2,7 @@
 #include "evsel.h"
 #include "stat.h"
 #include "color.h"
+#include "pmu.h"
 
 enum {
        CTX_BIT_USER    = 1 << 0,
@@ -35,9 +36,15 @@ static struct stats 
runtime_dtlb_cache_stats[NUM_CTX][MAX_NR_CPUS];
 static struct stats runtime_cycles_in_tx_stats[NUM_CTX][MAX_NR_CPUS];
 static struct stats runtime_transaction_stats[NUM_CTX][MAX_NR_CPUS];
 static struct stats runtime_elision_stats[NUM_CTX][MAX_NR_CPUS];
+static bool have_frontend_stalled;
 
 struct stats walltime_nsecs_stats;
 
+void perf_stat__init_shadow_stats(void)
+{
+       have_frontend_stalled = pmu_have_event("cpu", 
"stalled-cycles-frontend");
+}
+
 static int evsel_context(struct perf_evsel *evsel)
 {
        int ctx = 0;
@@ -323,7 +330,7 @@ void perf_stat__print_shadow_stats(struct perf_evsel *evsel,
                        print_metric(ctxp, NULL, "%7.2f ",
                                        "stalled cycles per insn",
                                        ratio);
-               } else {
+               } else if (have_frontend_stalled) {
                        print_metric(ctxp, NULL, NULL,
                                     "stalled cycles per insn", 0);
                }
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index f02af68..0150e78 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -72,6 +72,7 @@ typedef void (*print_metric_t)(void *ctx, const char *color, 
const char *unit,
                               const char *fmt, double val);
 typedef void (*new_line_t )(void *ctx);
 
+void perf_stat__init_shadow_stats(void);
 void perf_stat__reset_shadow_stats(void);
 void perf_stat__update_shadow_stats(struct perf_evsel *counter, u64 *count,
                                    int cpu);
-- 
2.5.0