[PATCH v3] perf stat: Fix wrong skipping for per-die aggregation
From: Jin Yao
Date: Thu Dec 24 2020 - 20:21:42 EST
Uncore becomes die-scope on Xeon Cascade Lake-AP and perf has supported
--per-die aggregation yet.
One issue is found in check_per_pkg() for uncore events running on
AP system. On cascade Lake-AP, we have:
S0-D0
S0-D1
S1-D0
S1-D1
But in check_per_pkg(), S0-D1 and S1-D1 are skipped because the
mask bits for S0 and S1 have been set for S0-D0 and S1-D0. It doesn't
check die_id. So the counting for S0-D1 and S1-D1 are set to zero.
That's not correct.
root@lkp-csl-2ap4 ~# ./perf stat -a -I 1000 -e llc_misses.mem_read --per-die -- sleep 5
1.001460963 S0-D0 1 1317376 Bytes llc_misses.mem_read
1.001460963 S0-D1 1 998016 Bytes llc_misses.mem_read
1.001460963 S1-D0 1 970496 Bytes llc_misses.mem_read
1.001460963 S1-D1 1 1291264 Bytes llc_misses.mem_read
2.003488021 S0-D0 1 1082048 Bytes llc_misses.mem_read
2.003488021 S0-D1 1 1919040 Bytes llc_misses.mem_read
2.003488021 S1-D0 1 890752 Bytes llc_misses.mem_read
2.003488021 S1-D1 1 2380800 Bytes llc_misses.mem_read
3.005613270 S0-D0 1 1126080 Bytes llc_misses.mem_read
3.005613270 S0-D1 1 2898176 Bytes llc_misses.mem_read
3.005613270 S1-D0 1 870912 Bytes llc_misses.mem_read
3.005613270 S1-D1 1 3388608 Bytes llc_misses.mem_read
4.007627598 S0-D0 1 1124608 Bytes llc_misses.mem_read
4.007627598 S0-D1 1 3884416 Bytes llc_misses.mem_read
4.007627598 S1-D0 1 921088 Bytes llc_misses.mem_read
4.007627598 S1-D1 1 4451840 Bytes llc_misses.mem_read
5.001479927 S0-D0 1 963328 Bytes llc_misses.mem_read
5.001479927 S0-D1 1 4831936 Bytes llc_misses.mem_read
5.001479927 S1-D0 1 895104 Bytes llc_misses.mem_read
5.001479927 S1-D1 1 5496640 Bytes llc_misses.mem_read
>From above output, we can see S0-D1 and S1-D1 don't report the interval
values, they are continued to grow. That's because check_per_pkg() wrongly
decides to use zero counts for S0-D1 and S1-D1.
So in check_per_pkg(), we should use hashmap(socket,die) to decide if
the cpu counts needs to skip. Only considering socket is not enough.
Now with this patch,
root@lkp-csl-2ap4 ~# ./perf stat -a -I 1000 -e llc_misses.mem_read --per-die -- sleep 5
1.001617187 S0-D0 1 952768 Bytes llc_misses.mem_read
1.001617187 S0-D1 1 849152 Bytes llc_misses.mem_read
1.001617187 S1-D0 1 854912 Bytes llc_misses.mem_read
1.001617187 S1-D1 1 948672 Bytes llc_misses.mem_read
2.004138021 S0-D0 1 1200256 Bytes llc_misses.mem_read
2.004138021 S0-D1 1 899840 Bytes llc_misses.mem_read
2.004138021 S1-D0 1 898752 Bytes llc_misses.mem_read
2.004138021 S1-D1 1 1039424 Bytes llc_misses.mem_read
3.006463971 S0-D0 1 1029056 Bytes llc_misses.mem_read
3.006463971 S0-D1 1 894336 Bytes llc_misses.mem_read
3.006463971 S1-D0 1 905088 Bytes llc_misses.mem_read
3.006463971 S1-D1 1 1042880 Bytes llc_misses.mem_read
4.008831441 S0-D0 1 920576 Bytes llc_misses.mem_read
4.008831441 S0-D1 1 877248 Bytes llc_misses.mem_read
4.008831441 S1-D0 1 883968 Bytes llc_misses.mem_read
4.008831441 S1-D1 1 967168 Bytes llc_misses.mem_read
5.001441349 S0-D0 1 864704 Bytes llc_misses.mem_read
5.001441349 S0-D1 1 827456 Bytes llc_misses.mem_read
5.001441349 S1-D0 1 829632 Bytes llc_misses.mem_read
5.001441349 S1-D1 1 925760 Bytes llc_misses.mem_read
On no-die system, die_id is 0, actually it's hashmap(socket,0), original behavior
is not changed.
Reported-by: Huang Ying <ying.huang@xxxxxxxxx>
Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
---
v3:
Since for some cpumap functions, the return type is changed from 'int' to
'struct aggr_cpu_id', the patch needs to be updated as well.
before:
d = cpu_map__get_die()
after:
d = cpu_map__get_die().die
v3 is compiled ok with tmp.perf/core.
v2:
Use hashmap to check the used socket+die pair.
tools/perf/util/evsel.c | 4 ++-
tools/perf/util/evsel.h | 3 +-
tools/perf/util/stat.c | 61 +++++++++++++++++++++++++++++++++++++----
3 files changed, 60 insertions(+), 8 deletions(-)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index c26ea82220bd..9715ed9b03f6 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -45,6 +45,7 @@
#include "string2.h"
#include "memswap.h"
#include "util.h"
+#include "hashmap.h"
#include "../perf-sys.h"
#include "util/parse-branch-options.h"
#include <internal/xyarray.h>
@@ -1377,7 +1378,8 @@ void evsel__exit(struct evsel *evsel)
zfree(&evsel->group_name);
zfree(&evsel->name);
zfree(&evsel->pmu_name);
- zfree(&evsel->per_pkg_mask);
+ hashmap__free(evsel->per_pkg_mask);
+ evsel->per_pkg_mask = NULL;
zfree(&evsel->metric_events);
perf_evsel__object.fini(evsel);
}
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index cd1d8dd43199..951628943fd0 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -17,6 +17,7 @@ struct cgroup;
struct perf_counts;
struct perf_stat_evsel;
union perf_event;
+struct hashmap;
typedef int (evsel__sb_cb_t)(union perf_event *event, void *data);
@@ -110,7 +111,7 @@ struct evsel {
bool merged_stat;
bool reset_group;
bool errored;
- unsigned long *per_pkg_mask;
+ struct hashmap *per_pkg_mask;
struct evsel *leader;
struct list_head config_terms;
int err;
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 8ce1479c98f0..5f70353fe491 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -13,6 +13,7 @@
#include "evlist.h"
#include "evsel.h"
#include "thread_map.h"
+#include "hashmap.h"
#include <linux/zalloc.h>
void update_stats(struct stats *stats, u64 val)
@@ -275,16 +276,39 @@ void evlist__save_aggr_prev_raw_counts(struct evlist *evlist)
static void zero_per_pkg(struct evsel *counter)
{
- if (counter->per_pkg_mask)
- memset(counter->per_pkg_mask, 0, cpu__max_cpu());
+ struct hashmap_entry *entry;
+ size_t bkt;
+
+ if (counter->per_pkg_mask) {
+ hashmap__for_each_entry(counter->per_pkg_mask, entry, bkt) {
+ bool *used = (bool *)entry->value;
+
+ *used = false;
+ }
+ }
+}
+
+static size_t id_hash(const void *key, void *ctx __maybe_unused)
+{
+ int socket = (int64_t)key >> 32;
+
+ return socket;
+}
+
+static bool id_equal(const void *key1, const void *key2,
+ void *ctx __maybe_unused)
+{
+ return (int64_t)key1 == (int64_t)key2;
}
static int check_per_pkg(struct evsel *counter,
struct perf_counts_values *vals, int cpu, bool *skip)
{
- unsigned long *mask = counter->per_pkg_mask;
+ struct hashmap *mask = counter->per_pkg_mask;
struct perf_cpu_map *cpus = evsel__cpus(counter);
- int s;
+ int s, d, ret;
+ uint64_t key;
+ bool *used;
*skip = false;
@@ -295,7 +319,7 @@ static int check_per_pkg(struct evsel *counter,
return 0;
if (!mask) {
- mask = zalloc(cpu__max_cpu());
+ mask = hashmap__new(id_hash, id_equal, NULL);
if (!mask)
return -ENOMEM;
@@ -317,7 +341,32 @@ static int check_per_pkg(struct evsel *counter,
if (s < 0)
return -1;
- *skip = test_and_set_bit(s, mask) == 1;
+ /*
+ * On multi-die system, 0 < die_id < 256. On no-die system, die_id = 0.
+ * We use hashmap(socket, die) to check the used socket+die pair.
+ */
+ d = cpu_map__get_die(cpus, cpu, NULL).die;
+ if (d < 0)
+ return -1;
+
+ key = (uint64_t)s << 32 | (d & 0xff);
+ if (hashmap__find(mask, (void *)key, (void **)&used)) {
+ if (*used)
+ *skip = true;
+ *used = true;
+ } else {
+ used = zalloc(sizeof(*used));
+ if (!used)
+ return -1;
+
+ *used = true;
+ ret = hashmap__add(mask, (void *)key, used);
+ if (ret) {
+ free(used);
+ return -1;
+ }
+ }
+
return 0;
}
--
2.17.1