From fb4605ba47e772ff9d62d1d54218a832ec8b3e1d Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Tue, 1 Mar 2016 10:57:52 -0800 Subject: [PATCH] perf stat: Check for frontend stalled for metrics 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 Signed-off-by: Andi Kleen Acked-by: Jiri Olsa Link: http://lkml.kernel.org/r/1456858672-21594-8-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo --- 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 9b5089c5dffe..baa82078c148 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -1966,6 +1966,7 @@ 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 5e2d2e34e1bc..b33ffb2af2cf 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 f02af68adc04..0150e786ccc7 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); -- 2.20.1