[PATCH V4 6/7] perf mem: Clean up perf_mem_events__record_args()

kan.liang
2024-01-23T18:51:16Z

The current code iterates all memory PMUs. It doesn't matter if the
system has only one memory PMU or multiple PMUs. The check of
perf_pmus__num_mem_pmus() is not required anymore.

The rec_tmp is not used in c2c and mem. Removing them as well.

Suggested-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
tools/perf/builtin-c2c.c | 15 ++-------------
tools/perf/builtin-mem.c | 18 ++----------------
tools/perf/util/mem-events.c | 34 ++++++++++++----------------------
tools/perf/util/mem-events.h | 3 +--
4 files changed, 17 insertions(+), 53 deletions(-)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index 838481505e08..3bcb903b6b38 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -3245,9 +3245,8 @@ static const char * const *record_mem_usage = __usage_record;

static int perf_c2c__record(int argc, const char **argv)
{
- int rec_argc, i = 0, j, rec_tmp_nr = 0;
+ int rec_argc, i = 0, j;
const char **rec_argv;
- char **rec_tmp;
int ret;
bool all_user = false, all_kernel = false;
bool event_set = false;
@@ -3285,12 +3284,6 @@ static int perf_c2c__record(int argc, const char **argv)
if (!rec_argv)
return -1;

- rec_tmp = calloc(rec_argc + 1, sizeof(char *));
- if (!rec_tmp) {
- free(rec_argv);
- return -1;
- }
-
rec_argv[i++] = "record";

if (!event_set) {
@@ -3319,7 +3312,7 @@ static int perf_c2c__record(int argc, const char **argv)
rec_argv[i++] = "--phys-data";
rec_argv[i++] = "--sample-cpu";

- ret = perf_mem_events__record_args(rec_argv, &i, rec_tmp, &rec_tmp_nr);
+ ret = perf_mem_events__record_args(rec_argv, &i);
if (ret)
goto out;

@@ -3346,10 +3339,6 @@ static int perf_c2c__record(int argc, const char **argv)

ret = cmd_record(i, rec_argv);
out:
- for (i = 0; i < rec_tmp_nr; i++)
- free(rec_tmp[i]);
-
- free(rec_tmp);
free(rec_argv);
return ret;
}
diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index ef64bae77ca7..1d92e309c97c 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -72,10 +72,9 @@ static const char * const *record_mem_usage = __usage;

static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
{
- int rec_argc, i = 0, j, tmp_nr = 0;
+ int rec_argc, i = 0, j;
int start, end;
const char **rec_argv;
- char **rec_tmp;
int ret;
bool all_user = false, all_kernel = false;
struct perf_mem_event *e;
@@ -116,15 +115,6 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
if (!rec_argv)
return -1;

- /*
- * Save the allocated event name strings.
- */
- rec_tmp = calloc(rec_argc + 1, sizeof(char *));
- if (!rec_tmp) {
- free(rec_argv);
- return -1;
- }
-
rec_argv[i++] = "record";

e = perf_pmu__mem_events_ptr(pmu, PERF_MEM_EVENTS__LOAD_STORE);
@@ -163,7 +153,7 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
rec_argv[i++] = "--data-page-size";

start = i;
- ret = perf_mem_events__record_args(rec_argv, &i, rec_tmp, &tmp_nr);
+ ret = perf_mem_events__record_args(rec_argv, &i);
if (ret)
goto out;
end = i;
@@ -193,10 +183,6 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)

ret = cmd_record(i, rec_argv);
out:
- for (i = 0; i < tmp_nr; i++)
- free(rec_tmp[i]);
-
- free(rec_tmp);
free(rec_argv);
return ret;
}
diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index 7d7df3d0b2b9..a20611b4fb1b 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -218,14 +218,14 @@ void perf_pmu__mem_events_list(struct perf_pmu *pmu)
}
}

-int perf_mem_events__record_args(const char **rec_argv, int *argv_nr,
- char **rec_tmp, int *tmp_nr)
+int perf_mem_events__record_args(const char **rec_argv, int *argv_nr)
{
const char *mnt = sysfs__mount();
struct perf_pmu *pmu = NULL;
- int i = *argv_nr, k = 0;
struct perf_mem_event *e;
-
+ int i = *argv_nr;
+ const char *s;
+ char *copy;

while ((pmu = perf_pmus__scan_mem(pmu)) != NULL) {
for (int j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
@@ -240,30 +240,20 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr,
return -1;
}

- if (perf_pmus__num_mem_pmus() == 1) {
- rec_argv[i++] = "-e";
- rec_argv[i++] = perf_pmu__mem_events_name(j, pmu);
- } else {
- const char *s = perf_pmu__mem_events_name(j, pmu);
-
- if (!perf_pmu__mem_events_supported(mnt, pmu, e))
- continue;
+ s = perf_pmu__mem_events_name(j, pmu);
+ if (!s || !perf_pmu__mem_events_supported(mnt, pmu, e))
+ continue;

- rec_argv[i++] = "-e";
- if (s) {
- char *copy = strdup(s);
- if (!copy)
- return -1;
+ copy = strdup(s);
+ if (!copy)
+ return -1;

- rec_argv[i++] = copy;
- rec_tmp[k++] = copy;
- }
- }
+ rec_argv[i++] = "-e";
+ rec_argv[i++] = copy;
}
}

*argv_nr = i;
- *tmp_nr = k;
return 0;
}

diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
index f817a507b106..c97cd3caa766 100644
--- a/tools/perf/util/mem-events.h
+++ b/tools/perf/util/mem-events.h
@@ -46,8 +46,7 @@ struct perf_pmu *perf_mem_events_find_pmu(void);
bool is_mem_loads_aux_event(struct evsel *leader);

void perf_pmu__mem_events_list(struct perf_pmu *pmu);
-int perf_mem_events__record_args(const char **rec_argv, int *argv_nr,
- char **rec_tmp, int *tmp_nr);
+int perf_mem_events__record_args(const char **rec_argv, int *argv_nr);

int perf_mem__tlb_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
--
2.35.1