[PATCH 10/24] perf metricgroup: Fix printing event names of metric group with multiple events incase of overlapping events

Arnaldo Carvalho de Melo
2020-03-25T12:42:19Z

From: Kajol Jain <kjain@linux.ibm.com>

Commit f01642e4912b ("perf metricgroup: Support multiple events for
metricgroup") introduced support for multiple events in a metric group.
But with the current upstream, metric events names are not printed
properly incase we try to run multiple metric groups with overlapping
event.

With current upstream version, incase of overlapping metric events issue
is, we always start our comparision logic from start. So, the events
which already matched with some metric group also take part in
comparision logic. Because of that when we have overlapping events, we
end up matching current metric group event with already matched one.

For example, in skylake machine we have metric event CoreIPC and
Instructions. Both of them need 'inst_retired.any' event value. As
events in Instructions is subset of events in CoreIPC, they endup in
pointing to same 'inst_retired.any' value.

In skylake platform:

command:# ./perf stat -M CoreIPC,Instructions -C 0 sleep 1

Performance counter stats for 'CPU(s) 0':

1,254,992,790 inst_retired.any # 1254992790.0
Instructions
# 1.3 CoreIPC
977,172,805 cycles
1,254,992,756 inst_retired.any

1.000802596 seconds time elapsed

command:# sudo ./perf stat -M UPI,IPC sleep 1

Performance counter stats for 'sleep 1':
948,650 uops_retired.retire_slots
866,182 inst_retired.any # 0.7 IPC
866,182 inst_retired.any
1,175,671 cpu_clk_unhalted.thread

Patch fixes the issue by adding a new bool pointer 'evlist_used' to keep
track of events which already matched with some group by setting it
true. So, we skip all used events in list when we start comparision
logic. Patch also make some changes in comparision logic, incase we get
a match miss, we discard the whole match and start again with first
event id in metric event.

With this patch:

In skylake platform:

command:# ./perf stat -M CoreIPC,Instructions -C 0 sleep 1

Performance counter stats for 'CPU(s) 0':

3,348,415 inst_retired.any # 0.3 CoreIPC
11,779,026 cycles
3,348,381 inst_retired.any # 3348381.0
Instructions

1.001649056 seconds time elapsed

command:# ./perf stat -M UPI,IPC sleep 1

Performance counter stats for 'sleep 1':

1,023,148 uops_retired.retire_slots # 1.1 UPI
924,976 inst_retired.any
924,976 inst_retired.any # 0.6 IPC
1,489,414 cpu_clk_unhalted.thread

1.003064672 seconds time elapsed

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Link: http://lore.kernel.org/lkml/20200221101121.28920-1-kjain@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/metricgroup.c | 49 +++++++++++++++++++++--------------
1 file changed, 30 insertions(+), 19 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index c3a8c701609a..926449a7cdbf 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -95,13 +95,16 @@ struct egroup {
static struct evsel *find_evsel_group(struct evlist *perf_evlist,
const char **ids,
int idnum,
- struct evsel **metric_events)
+ struct evsel **metric_events,
+ bool *evlist_used)
{
struct evsel *ev;
- int i = 0;
+ int i = 0, j = 0;
bool leader_found;

evlist__for_each_entry (perf_evlist, ev) {
+ if (evlist_used[j++])
+ continue;
if (!strcmp(ev->name, ids[i])) {
if (!metric_events[i])
metric_events[i] = ev;
@@ -109,22 +112,17 @@ static struct evsel *find_evsel_group(struct evlist *perf_evlist,
if (i == idnum)
break;
} else {
- if (i + 1 == idnum) {
- /* Discard the whole match and start again */
- i = 0;
- memset(metric_events, 0,
- sizeof(struct evsel *) * idnum);
- continue;
- }
-
- if (!strcmp(ev->name, ids[i]))
- metric_events[i] = ev;
- else {
- /* Discard the whole match and start again */
- i = 0;
- memset(metric_events, 0,
- sizeof(struct evsel *) * idnum);
- continue;
+ /* Discard the whole match and start again */
+ i = 0;
+ memset(metric_events, 0,
+ sizeof(struct evsel *) * idnum);
+
+ if (!strcmp(ev->name, ids[i])) {
+ if (!metric_events[i])
+ metric_events[i] = ev;
+ i++;
+ if (i == idnum)
+ break;
}
}
}
@@ -146,7 +144,10 @@ static struct evsel *find_evsel_group(struct evlist *perf_evlist,
!strcmp(ev->name, metric_events[i]->name)) {
ev->metric_leader = metric_events[i];
}
+ j++;
}
+ ev = metric_events[i];
+ evlist_used[ev->idx] = true;
}

return metric_events[0];
@@ -162,6 +163,13 @@ static int metricgroup__setup_events(struct list_head *groups,
int ret = 0;
struct egroup *eg;
struct evsel *evsel;
+ bool *evlist_used;
+
+ evlist_used = calloc(perf_evlist->core.nr_entries, sizeof(bool));
+ if (!evlist_used) {
+ ret = -ENOMEM;
+ return ret;
+ }

list_for_each_entry (eg, groups, nd) {
struct evsel **metric_events;
@@ -172,7 +180,7 @@ static int metricgroup__setup_events(struct list_head *groups,
break;
}
evsel = find_evsel_group(perf_evlist, eg->ids, eg->idnum,
- metric_events);
+ metric_events, evlist_used);
if (!evsel) {
pr_debug("Cannot resolve %s: %s\n",
eg->metric_name, eg->metric_expr);
@@ -196,6 +204,9 @@ static int metricgroup__setup_events(struct list_head *groups,
expr->metric_events = metric_events;
list_add(&expr->nd, &me->head);
}
+
+ free(evlist_used);
+
return ret;
}

--
2.21.1