From 25f69c69bc3ca8c781a94473f28d443d745768e3 Mon Sep 17 00:00:00 2001 From: Changbin Du Date: Thu, 2 Mar 2023 11:11:44 +0800 Subject: perf stat: Fix counting when initial delay configured When creating counters with initial delay configured, the enable_on_exec field is not set. So we need to enable the counters later. The problem is, when a workload is specified the target__none() is true. So we also need to check stat_config.initial_delay. In this change, we add a new field 'initial_delay' for struct target which could be shared by other subcommands. And define target__enable_on_exec() which returns whether enable_on_exec should be set on normal cases. Before this fix the event is not counted: $ ./perf stat -e instructions -D 100 sleep 2 Events disabled Events enabled Performance counter stats for 'sleep 2': instructions 1.901661124 seconds time elapsed 0.001602000 seconds user 0.000000000 seconds sys After fix it works: $ ./perf stat -e instructions -D 100 sleep 2 Events disabled Events enabled Performance counter stats for 'sleep 2': 404,214 instructions 1.901743475 seconds time elapsed 0.001617000 seconds user 0.000000000 seconds sys Fixes: c587e77e100fa40e ("perf stat: Do not delay the workload with --delay") Signed-off-by: Changbin Du Acked-by: Namhyung Kim Cc: Alexander Shishkin Cc: Hui Wang Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20230302031146.2801588-2-changbin.du@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-stat.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) (limited to 'tools/perf/builtin-stat.c') diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 5d18a5a6f662..fa7c40956d0f 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -539,12 +539,7 @@ static int enable_counters(void) return err; } - /* - * We need to enable counters only if: - * - we don't have tracee (attaching to task or cpu) - * - we have initial delay configured - */ - if (!target__none(&target)) { + if (!target__enable_on_exec(&target)) { if (!all_counters_use_bpf) evlist__enable(evsel_list); } @@ -914,7 +909,7 @@ try_again_reset: return err; } - if (stat_config.initial_delay) { + if (target.initial_delay) { pr_info(EVLIST_DISABLED_MSG); } else { err = enable_counters(); @@ -926,8 +921,8 @@ try_again_reset: if (forks) evlist__start_workload(evsel_list); - if (stat_config.initial_delay > 0) { - usleep(stat_config.initial_delay * USEC_PER_MSEC); + if (target.initial_delay > 0) { + usleep(target.initial_delay * USEC_PER_MSEC); err = enable_counters(); if (err) return -1; @@ -1248,7 +1243,7 @@ static struct option stat_options[] = { "aggregate counts per thread", AGGR_THREAD), OPT_SET_UINT(0, "per-node", &stat_config.aggr_mode, "aggregate counts per numa node", AGGR_NODE), - OPT_INTEGER('D', "delay", &stat_config.initial_delay, + OPT_INTEGER('D', "delay", &target.initial_delay, "ms to wait before starting measurement after program start (-1: start with events disabled)"), OPT_CALLBACK_NOOPT(0, "metric-only", &stat_config.metric_only, NULL, "Only print computed metrics. No raw values", enable_metric_only), -- cgit v1.2.3