linux-kernel - [PATCH 1/2] perf stat: refactor __run_perf

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Date:   Fri, 29 Jul 2022 16:12:43 +0000
From:   Adrián Herrera Arcila <adrian.herrera@....com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org, leo.yan@...aro.org, songliubraving@...com,
        james.clark@....com,
        Adrián Herrera Arcila <adrian.herrera@....com>
Subject: [PATCH 1/2] perf stat: refactor __run_perf_stat common code

This extracts common code from the branches of the forks if-then-else.
enable_counters(), which was at the beginning of both branches of the
conditional, is now unconditional; evlist__start_workload is extracted
to a different if, which enables making the common clocking code
unconditional.

Signed-off-by: Adrián Herrera Arcila <adrian.herrera@....com>
---
 tools/perf/builtin-stat.c | 25 +++++++++----------------
 1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index d2ecd4d29624..318ffd119dad 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -966,18 +966,18 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
 			return err;
 	}
 
-	/*
-	 * Enable counters and exec the command:
-	 */
-	if (forks) {
-		err = enable_counters();
-		if (err)
-			return -1;
+	err = enable_counters();
+	if (err)
+		return -1;
+
+	/* Exec the command, if any */
+	if (forks)
 		evlist__start_workload(evsel_list);
 
-		t0 = rdclock();
-		clock_gettime(CLOCK_MONOTONIC, &ref_time);
+	t0 = rdclock();
+	clock_gettime(CLOCK_MONOTONIC, &ref_time);
 
+	if (forks) {
 		if (interval || timeout || evlist__ctlfd_initialized(evsel_list))
 			status = dispatch_events(forks, timeout, interval, &times);
 		if (child_pid != -1) {
@@ -995,13 +995,6 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
 		if (WIFSIGNALED(status))
 			psignal(WTERMSIG(status), argv[0]);
 	} else {
-		err = enable_counters();
-		if (err)
-			return -1;
-
-		t0 = rdclock();
-		clock_gettime(CLOCK_MONOTONIC, &ref_time);
-
 		status = dispatch_events(forks, timeout, interval, &times);
 	}
 
-- 
2.36.1