Create source symlink in perf object dir

Extend the searching for the test files so that it works when running perf from a separate objdir, and also when the perf executable is symlinked.

Signed-off-by Andi Kleen <[email protected]>

----

v2: Fix string test (Namhyung)
Handle both in source and out of source builds.

---
 tools/perf/tests/tests-scripts.c | 37 +++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

tools/perf/tests/tests-scripts.c +19 -3

index e2042b368269..9f71ffed702c 100644
@@ -29,16 +29,47 @@
 
 static int shell_tests__dir_fd(void)
 {
-	char path[PATH_MAX], *exec_path;
-	static const char * const devel_dirs[] = { "./tools/perf/tests/shell", "./tests/shell", };
+	struct stat st;
+	char path[PATH_MAX], path2[PATH_MAX], *exec_path;
+	static const char * const devel_dirs[] = {
+		"./tools/perf/tests/shell",
+		"./tests/shell",
+		"./source/tests/shell"
+	};
+	int fd;
+	char *p;
 
 	for (size_t i = 0; i < ARRAY_SIZE(devel_dirs); ++i) {
-		int fd = open(devel_dirs[i], O_PATH);
+		fd = open(devel_dirs[i], O_PATH);
 
 		if (fd >= 0)
 			return fd;
 	}
 
+	/* Use directory of executable */
+	if (readlink("/proc/self/exe", path2, sizeof path2) < 0)
+		return -1;
+	/* Follow another level of symlink if there */
+	if (lstat(path2, &st) == 0 && (st.st_mode & S_IFMT) == S_IFLNK) {
+		scnprintf(path, sizeof(path), path2);
+		if (readlink(path, path2, sizeof path2) < 0)
+			return -1;
+	}

tools/perf/tests/tests-scripts.c +5 -0

+	scnprintf(path, sizeof(path), "%s/source/tests/shell", path2);
+	fd = open(path, O_PATH);
+	if (fd >= 0)
+		return fd;
+
 	/* Then installed path. */
 	exec_path = get_argv_exec_path();
 	scnprintf(path, sizeof(path), "%s/tests/shell", exec_path);

Signature · 1 line

2.45.2

This fixes a regression with perf script -F +metric originally caused by :

commit 37cc8ad77cf81f3ffd226856c367b0e15333a738

Author: Ian Rogers <[email protected]>
Date:   Sun Feb 19 01:28:46 2023 -0800

perf metric: Directly use counts rather than saved_value

In the perf script environment the evsel wouldn't allocate an aggr values array, which led to a -1 reference because the metric evaluation would try to reference NULL - 1 (for aggr_idx)

Give the perf script evsels a single CPU aggr setup. That's enough because the groups are always contiguous, so no need to store more than one CPU's worth of values.

Before

% perf record -e '{cycles,instructions}:S' perf bench mem memcpy % perf script -F +metric
Segmentation fault (core dumped)

After:

% perf record -e '{cycles,instructions}:S' perf bench mem memcpy
...
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.028 MB perf.data (90 samples) ] % perf script -F +metric

       perf-exec 1847557 264658.180789:       3009       cycles:  ffffffff990a579a native_write_msr+0xa ([kernel.kallsyms])
       perf-exec 1847557 264658.180789:        382 instructions:  ffffffff990a579a native_write_msr+0xa ([kernel.kallsyms])
       perf-exec 1847557 264658.180789:         metric:    0.13  insn per cycle

...

Fixes 37cc8ad77cf8 ("perf metric: Directly use counts rather ...")

Signed-off-by Andi Kleen <[email protected]>

----

v2: Reformat code
v3: Work around bogus warning
v4: Set up aggr map only for metrics case to keep perf stat record working
v5: Broken version
v6: Only set up limited aggregation mode with -F +metric. Add conflict checks with perf stat record files.
v7: Remove some unnecessary conflict checks. Fix buffer overflow. Minor cleanups.
v8: Add check for leader sampling. Update some comments.

---
 tools/perf/builtin-script.c | 50 +++++++++++++++++++++++++++++++++----
 1 file changed, 45 insertions(+), 5 deletions(-)

tools/perf/builtin-script.c +0 -1

index c16224b1fef3..04378615b2ad 100644
@@ -335,7 +335,6 @@ struct evsel_script {
        FILE *fp;
        u64  samples;
        /* For metric output */
-       u64  val;
        int  gnum;
 };
 

@@ -2127,18 +2126,30 @@ static void perf_sample__fprint_metric(struct perf_script *script,
 	};
 	struct evsel *ev2;
 	u64 val;

tools/perf/builtin-script.c +42 -2

+		if (!printed)
+			fprintf(stderr, "perf script: -F metric requires {}:S for groups leader sampling\n");
+		printed = 1;
+		return;
+	}
+	/*
+	 * Always use the first entry as storage because the leader sampling
+	 * groups are contiguous and there's no need to handle multiple indexes
+	 * for anything.
+	 */
+	evsel->stats->aggr[0].counts.val = val;
 	if (evsel_script(leader)->gnum == leader->core.nr_members) {
 		for_each_group_member (ev2, leader) {
 			perf_stat__print_shadow_stats(&stat_config, ev2,
-						      evsel_script(ev2)->val,
-						      sample->cpu,
+						      evsel->stats->aggr[0].counts.val,
+						      0,
 						      &ctx,
 						      NULL);
 		}

@@ -2325,6 +2336,20 @@ static void process_event(struct perf_script *script,
 		fflush(fp);
 }
 
+static void check_metric_conflict(void)
+{
+	int i;
+	/*
+	 * Avoid conflict with the aggregation mode used for the metric printing.
+	 */
+	for (i = 0; i < OUTPUT_TYPE_MAX; i++) {
+		if (output[i].fields & PERF_OUTPUT_METRIC) {
+			fprintf(stderr, "perf stat record files are not supported with -F metric\n");
+			exit(1);
+		}
+	}
+}
+
 static struct scripting_ops	*scripting_ops;
 
 static void __process_stat(struct evsel *counter, u64 tstamp)

@@ -2334,6 +2359,8 @@ static void __process_stat(struct evsel *counter, u64 tstamp)
 	struct perf_cpu cpu;
 	static int header_printed;
 
+	check_metric_conflict();
+
 	if (!header_printed) {
 		printf("%3s %8s %15s %15s %15s %15s %s\n",
 		       "CPU", "THREAD", "VAL", "ENA", "RUN", "TIME", "EVENT");

@@ -3725,6 +3752,8 @@ static int process_stat_config_event(struct perf_session *session __maybe_unused
 {
 	perf_event__read_stat_config(&stat_config, &event->stat_config);
 
+	check_metric_conflict();
+
 	/*
 	 * Aggregation modes are not used since post-processing scripts are
 	 * supposed to take care of such requirements

@@ -4088,6 +4117,17 @@ int cmd_script(int argc, const char **argv)
 
 	argc = parse_options_subcommand(argc, argv, options, script_subcommands, script_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
+	for (i = 0; i < OUTPUT_TYPE_MAX; i++) {
+		if (output[i].fields & PERF_OUTPUT_METRIC) {
+			stat_config.aggr_map = cpu_aggr_map__empty_new(1);
+			err = -ENOMEM;
+			if (!stat_config.aggr_map)
+				goto out;
+			err = 0;
+			stat_config.aggr_map->nr = 1;
+			break;
+		}
+	}
 
 	if (symbol_conf.guestmount ||
 	    symbol_conf.default_guest_vmlinux_name ||

Signature · 1 line

2.45.2

Just a simple test

Signed-off-by Andi Kleen <[email protected]>

----

v2: Avoid bashisms. Use noploop
v3: Avoid false positive in shellcheck
v4: Use :S in the test (Ian, Namhyung)

---
 tools/perf/tests/shell/script.sh | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

tools/perf/tests/shell/script.sh +14 -0

index c1a603653662..e69c3548583a 100755
@@ -7,6 +7,7 @@ set -e
 temp_dir=$(mktemp -d /tmp/perf-test-script.XXXXXXXXXX)
 
 perfdatafile="${temp_dir}/perf.data"
+scriptoutput="${temp_dir}/script"
 db_test="${temp_dir}/db_test.py"
 
 err=0

@@ -88,8 +89,21 @@ test_parallel_perf()
 	echo "parallel-perf test [Success]"
 }
 
+test_metric()
+{
+	echo "script metric test"
+	if ! perf list | grep -q cycles ; then return ; fi
+	if ! perf list | grep -q instructions ; then return ; fi
+	perf record -e '{cycles,instructions}:S' -o "${perfdatafile}" perf test -w noploop
+	perf script -i "${perfdatafile}" -F +metric  > $scriptoutput
+	test "`grep -c metric $scriptoutput`" -gt 5
+	grep metric $scriptoutput | head
+	echo "script metric test [Success]"
+}
+
 test_db
 test_parallel_perf
+test_metric
 
 cleanup
 

Signature · 1 line

2.45.2