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.
001586691 S0-D0 1
1229440 Bytes llc_misses.mem_read
1.
001586691 S0-D1 1 976832 Bytes llc_misses.mem_read
1.
001586691 S1-D0 1 938304 Bytes llc_misses.mem_read
1.
001586691 S1-D1 1
1227328 Bytes llc_misses.mem_read
2.
003776312 S0-D0 1
1586752 Bytes llc_misses.mem_read
2.
003776312 S0-D1 1 875392 Bytes llc_misses.mem_read
2.
003776312 S1-D0 1 855616 Bytes llc_misses.mem_read
2.
003776312 S1-D1 1 949376 Bytes llc_misses.mem_read
3.
006512788 S0-D0 1
1338880 Bytes llc_misses.mem_read
3.
006512788 S0-D1 1 920064 Bytes llc_misses.mem_read
3.
006512788 S1-D0 1 877184 Bytes llc_misses.mem_read
3.
006512788 S1-D1 1
1020736 Bytes llc_misses.mem_read
4.
008895291 S0-D0 1 926592 Bytes llc_misses.mem_read
4.
008895291 S0-D1 1 906368 Bytes llc_misses.mem_read
4.
008895291 S1-D0 1 892224 Bytes llc_misses.mem_read
4.
008895291 S1-D1 1 987712 Bytes llc_misses.mem_read
5.
001590993 S0-D0 1 962624 Bytes llc_misses.mem_read
5.
001590993 S0-D1 1 912512 Bytes llc_misses.mem_read
5.
001590993 S1-D0 1 891200 Bytes llc_misses.mem_read
5.
001590993 S1-D1 1 978432 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: Ying Huang <ying.huang@intel.com>
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ying Huang <ying.huang@intel.com>
Link: http://lore.kernel.org/lkml/20210128013417.25597-1-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
#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>
zfree(&evsel->group_name);
zfree(&evsel->name);
zfree(&evsel->pmu_name);
- zfree(&evsel->per_pkg_mask);
+ evsel__zero_per_pkg(evsel);
+ hashmap__free(evsel->per_pkg_mask);
+ evsel->per_pkg_mask = NULL;
zfree(&evsel->metric_events);
perf_evsel__object.fini(evsel);
}
return store_evsel_ids(evsel, evlist);
}
+
+void evsel__zero_per_pkg(struct evsel *evsel)
+{
+ struct hashmap_entry *cur;
+ size_t bkt;
+
+ if (evsel->per_pkg_mask) {
+ hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt)
+ free((char *)cur->key);
+
+ hashmap__clear(evsel->per_pkg_mask);
+ }
+}
union perf_event;
struct bpf_counter_ops;
struct target;
+struct hashmap;
typedef int (evsel__sb_cb_t)(union perf_event *event, void *data);
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;
int evsel__store_ids(struct evsel *evsel, struct evlist *evlist);
+void evsel__zero_per_pkg(struct evsel *evsel);
#endif /* __PERF_EVSEL_H */
util/units.c
util/affinity.c
util/rwsem.c
+util/hashmap.c
#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)
}
}
-static void zero_per_pkg(struct evsel *counter)
+static size_t pkg_id_hash(const void *__key, void *ctx __maybe_unused)
{
- if (counter->per_pkg_mask)
- memset(counter->per_pkg_mask, 0, cpu__max_cpu());
+ uint64_t *key = (uint64_t *) __key;
+
+ return *key & 0xffffffff;
+}
+
+static bool pkg_id_equal(const void *__key1, const void *__key2,
+ void *ctx __maybe_unused)
+{
+ uint64_t *key1 = (uint64_t *) __key1;
+ uint64_t *key2 = (uint64_t *) __key2;
+
+ return *key1 == *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 = 0;
+ uint64_t *key;
*skip = false;
return 0;
if (!mask) {
- mask = zalloc(cpu__max_cpu());
+ mask = hashmap__new(pkg_id_hash, pkg_id_equal, NULL);
if (!mask)
return -ENOMEM;
if (s < 0)
return -1;
- *skip = test_and_set_bit(s, mask) == 1;
- return 0;
+ /*
+ * On multi-die system, die_id > 0. 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 = malloc(sizeof(*key));
+ if (!key)
+ return -ENOMEM;
+
+ *key = (uint64_t)d << 32 | s;
+ if (hashmap__find(mask, (void *)key, NULL))
+ *skip = true;
+ else
+ ret = hashmap__add(mask, (void *)key, (void *)1);
+
+ return ret;
}
static int
}
if (counter->per_pkg)
- zero_per_pkg(counter);
+ evsel__zero_per_pkg(counter);
ret = process_counter_maps(config, counter);
if (ret)
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