Re: [PATCH v1 4/5] perf mem: Support record for hybrid platform
From: Jin, Yao
Date: Tue May 25 2021 - 03:00:42 EST
Hi Jiri,
On 5/25/2021 1:19 AM, Jiri Olsa wrote:
On Thu, May 20, 2021 at 03:00:39PM +0800, Jin Yao wrote:
Support 'perf mem record' for hybrid platform. On hybrid platform,
such as Alderlake, when executing 'perf mem record', it actually calls:
record -e {cpu_core/mem-loads-aux/,cpu_core/mem-loads,ldlat=30/}:P
-e cpu_atom/mem-loads,ldlat=30/P
-e cpu_core/mem-stores/P
-e cpu_atom/mem-stores/P
Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
---
tools/perf/builtin-mem.c | 39 ++++++++++++----------
tools/perf/util/mem-events.c | 65 ++++++++++++++++++++++++++++++++++++
tools/perf/util/mem-events.h | 2 ++
3 files changed, 89 insertions(+), 17 deletions(-)
diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index 03795bf49d51..a50abcb45f0f 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -62,8 +62,9 @@ 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;
+ int rec_argc, i = 0, j, tmp_nr = 0;
const char **rec_argv;
+ char **rec_tmp;
int ret;
bool all_user = false, all_kernel = false;
struct perf_mem_event *e;
@@ -87,11 +88,20 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
argc = parse_options(argc, argv, options, record_mem_usage,
PARSE_OPT_KEEP_UNKNOWN);
- rec_argc = argc + 9; /* max number of arguments */
+ rec_argc = argc + 64; /* max number of arguments */
please add comment on how you got the number 64
original max number of arguments is 9, *2 (=18) for hybrid pmus. 18 should be OK. I use 64 is to
allocate a big enough value.
rec_argv = calloc(rec_argc + 1, sizeof(char *));
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;
+ }
why not do strdup on all of them and always call free instead?
that would get rid of the rec_tmp and tmp_nr
That is also one method. Let me try it.
+
rec_argv[i++] = "record";
e = perf_mem_events__ptr(PERF_MEM_EVENTS__LOAD_STORE);
@@ -128,21 +138,9 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
if (mem->data_page_size)
rec_argv[i++] = "--data-page-size";
- for (j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
- e = perf_mem_events__ptr(j);
- if (!e->record)
- continue;
-
- if (!e->supported) {
- pr_err("failed: event '%s' not supported\n",
- perf_mem_events__name(j, NULL));
- free(rec_argv);
- return -1;
- }
-
- rec_argv[i++] = "-e";
- rec_argv[i++] = perf_mem_events__name(j, NULL);
- }
+ ret = perf_mem_events__record_args(rec_argv, &i, rec_tmp, &tmp_nr);
+ if (ret)
+ goto out;
if (all_user)
rec_argv[i++] = "--all-user";
@@ -164,6 +162,13 @@ 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++) {
+ if (rec_tmp[i])
+ free(rec_tmp[i]);
no need to check rec_tmp[i] != NULL, free will do that
Yes, no need checking for NULL here.
Thanks
Jin Yao
+ }
+
+ 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 e8f6e745eaf0..909ee91b75f0 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -173,6 +173,71 @@ void perf_mem_events__list(void)
}
}
+static void perf_mem_events__print_unsupport_hybrid(struct perf_mem_event *e,
+ int idx)
+{
+ const char *mnt = sysfs__mount();
+ char sysfs_name[100];
+ struct perf_pmu *pmu;
+
+ perf_pmu__for_each_hybrid_pmu(pmu) {
+ scnprintf(sysfs_name, sizeof(sysfs_name), e->sysfs_name,
+ pmu->name);
+ if (!perf_mem_events__supported(mnt, sysfs_name)) {
+ pr_err("failed: event '%s' not supported\n",
+ perf_mem_events__name(idx, pmu->name));
+ }
+ }
+}
+
+int perf_mem_events__record_args(const char **rec_argv, int *argv_nr,
+ char **rec_tmp, int *tmp_nr)
+{
+ int i = *argv_nr, k = 0;
+ struct perf_mem_event *e;
+ struct perf_pmu *pmu;
+ char *s;
+
+ for (int j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
+ e = perf_mem_events__ptr(j);
+ if (!e->record)
+ continue;
+
+ if (!perf_pmu__has_hybrid()) {
+ if (!e->supported) {
+ pr_err("failed: event '%s' not supported\n",
+ perf_mem_events__name(j, NULL));
+ return -1;
+ }
+
+ rec_argv[i++] = "-e";
+ rec_argv[i++] = perf_mem_events__name(j, NULL);
+ } else {
+ if (!e->supported) {
+ perf_mem_events__print_unsupport_hybrid(e, j);
+ return -1;
+ }
+
+ perf_pmu__for_each_hybrid_pmu(pmu) {
+ rec_argv[i++] = "-e";
+ s = perf_mem_events__name(j, pmu->name);
+ if (s) {
+ s = strdup(s);
+ if (!s)
+ return -1;
+
+ rec_argv[i++] = s;
+ rec_tmp[k++] = s;
+ }
+ }
+ }
+ }
+
+ *argv_nr = i;
+ *tmp_nr = k;
+ return 0;
+}
+
static const char * const tlb_access[] = {
"N/A",
"HIT",
diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
index a3fa19093fd2..916242f8020a 100644
--- a/tools/perf/util/mem-events.h
+++ b/tools/perf/util/mem-events.h
@@ -43,6 +43,8 @@ struct perf_mem_event *perf_mem_events__ptr(int i);
bool is_mem_loads_aux_event(struct evsel *leader);
void perf_mem_events__list(void);
+int perf_mem_events__record_args(const char **rec_argv, int *argv_nr,
+ char **rec_tmp, int *tmp_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);
--
2.17.1