xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf metricgroup: Support multiple events for metricgroup

Browse Source 
Some uncore metrics don't work as expected. For example, on
cascadelakex:

  root@lkp-csl-2sp2:~# perf stat -M UNC_M_PMM_BANDWIDTH.TOTAL -a -- sleep 1

   Performance counter stats for 'system wide':

           1841092      unc_m_pmm_rpq_inserts
           3680816      unc_m_pmm_wpq_inserts

       1.001775055 seconds time elapsed

  root@lkp-csl-2sp2:~# perf stat -M UNC_M_PMM_READ_LATENCY -a -- sleep 1

   Performance counter stats for 'system wide':

         860649746      unc_m_pmm_rpq_occupancy.all
           1840557      unc_m_pmm_rpq_inserts
       12790627455      unc_m_clockticks

       1.001773348 seconds time elapsed

No metrics 'UNC_M_PMM_BANDWIDTH.TOTAL' or 'UNC_M_PMM_READ_LATENCY' are
reported.

The issue is, the case of an alias expanding to mulitple events is not
supported, typically the uncore events.  (see comments in
find_evsel_group()).

For UNC_M_PMM_BANDWIDTH.TOTAL in above example, the expanded event group
is '{unc_m_pmm_rpq_inserts,unc_m_pmm_wpq_inserts}:W', but the actual
events passed to find_evsel_group are:

  unc_m_pmm_rpq_inserts
  unc_m_pmm_rpq_inserts
  unc_m_pmm_rpq_inserts
  unc_m_pmm_rpq_inserts
  unc_m_pmm_rpq_inserts
  unc_m_pmm_rpq_inserts
  unc_m_pmm_wpq_inserts
  unc_m_pmm_wpq_inserts
  unc_m_pmm_wpq_inserts
  unc_m_pmm_wpq_inserts
  unc_m_pmm_wpq_inserts
  unc_m_pmm_wpq_inserts

For this multiple events case, it's not supported well.

This patch introduces a new field 'metric_leader' in struct evsel. The
first event is considered as a metric leader. For the rest of same
events, they point to the first event via it's metric_leader field in
struct evsel.

This design is for adding the counting results of all same events to the
first event in group (the metric_leader).

With this patch,

  root@lkp-csl-2sp2:~# perf stat -M UNC_M_PMM_BANDWIDTH.TOTAL -a -- sleep 1

   Performance counter stats for 'system wide':

           1842108      unc_m_pmm_rpq_inserts     #    337.2 MB/sec  UNC_M_PMM_BANDWIDTH.TOTAL
           3682209      unc_m_pmm_wpq_inserts

       1.001819706 seconds time elapsed

  root@lkp-csl-2sp2:~# perf stat -M UNC_M_PMM_READ_LATENCY -a -- sleep 1

   Performance counter stats for 'system wide':

         861970685      unc_m_pmm_rpq_occupancy.all #    219.4 ns  UNC_M_PMM_READ_LATENCY
           1842772      unc_m_pmm_rpq_inserts
       12790196356      unc_m_clockticks

       1.001749103 seconds time elapsed

Now we can see the correct metrics 'UNC_M_PMM_BANDWIDTH.TOTAL' and
'UNC_M_PMM_READ_LATENCY'.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20190828055932.8269-5-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao
2019-08-28 13:59:32 +08:00
committed by Arnaldo Carvalho de Melo
parent 287f2649f7
commit f01642e491
3 changed files with 68 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
tools/perf/util/stat-shadow.c
View File

@@ -31,6 +31,8 @@ struct saved_value {
int cpu;
struct runtime_stat *stat;
struct stats stats;
u64 metric_total;
int metric_other;
};
static int saved_value_cmp(struct rb_node *rb_node, const void *entry)
@@ -212,6 +214,7 @@ void perf_stat__update_shadow_stats(struct evsel *counter, u64 count,
{
int ctx = evsel_context(counter);
u64 count_ns = count;
struct saved_value *v;
count *= counter->scale;
@@ -266,9 +269,15 @@ void perf_stat__update_shadow_stats(struct evsel *counter, u64 count,
update_runtime_stat(st, STAT_APERF, ctx, cpu, count);
if (counter->collect_stat) {
struct saved_value *v = saved_value_lookup(counter, cpu, true,
STAT_NONE, 0, st);
v = saved_value_lookup(counter, cpu, true, STAT_NONE, 0, st);
update_stats(&v->stats, count);
if (counter->metric_leader)
v->metric_total += count;
} else if (counter->metric_leader) {
v = saved_value_lookup(counter->metric_leader,
cpu, true, STAT_NONE, 0, st);
v->metric_total += count;
v->metric_other++;
}
}
@@ -729,10 +738,10 @@ static void generic_metric(struct perf_stat_config *config,
char *n, *pn;
expr__ctx_init(&pctx);
expr__add_id(&pctx, name, avg);
for (i = 0; metric_events[i]; i++) {
struct saved_value *v;
struct stats *stats;
u64 metric_total = 0;
if (!strcmp(metric_events[i]->name, "duration_time")) {
stats = &walltime_nsecs_stats;
@@ -744,6 +753,9 @@ static void generic_metric(struct perf_stat_config *config,
break;
stats = &v->stats;
scale = 1.0;
if (v->metric_other)
metric_total = v->metric_total;
}
n = strdup(metric_events[i]->name);
@@ -757,8 +769,15 @@ static void generic_metric(struct perf_stat_config *config,
pn = strchr(n, ' ');
if (pn)
*pn = 0;
expr__add_id(&pctx, n, avg_stats(stats)*scale);
if (metric_total)
expr__add_id(&pctx, n, metric_total);
else
expr__add_id(&pctx, n, avg_stats(stats)*scale);
}
expr__add_id(&pctx, name, avg);
if (!metric_events[i]) {
const char *p = metric_expr;