From 2f87f33f4226523df9c9cc28f9874ea02fcc3d3f Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Mon, 24 Jun 2019 12:37:10 -0700 Subject: [PATCH] perf stat: Fix group lookup for metric group The metric group code tries to find a group it added earlier in the evlist. Fix the lookup to handle groups with partially overlaps correctly. When a sub string match fails and we reset the match, we have to compare the first element again. I also renamed the find_evsel function to find_evsel_group to make its purpose clearer. With the earlier changes this fixes: Before: % perf stat -M UPI,IPC sleep 1 ... 1,032,922 uops_retired.retire_slots # 1.1 UPI 1,896,096 inst_retired.any 1,896,096 inst_retired.any 1,177,254 cpu_clk_unhalted.thread After: % perf stat -M UPI,IPC sleep 1 ... 1,013,193 uops_retired.retire_slots # 1.1 UPI 932,033 inst_retired.any 932,033 inst_retired.any # 0.9 IPC 1,091,245 cpu_clk_unhalted.thread Signed-off-by: Andi Kleen Acked-by: Jiri Olsa Cc: Kan Liang Fixes: b18f3e365019 ("perf stat: Support JSON metrics in perf stat") Link: http://lkml.kernel.org/r/20190624193711.35241-4-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/metricgroup.c | 47 ++++++++++++++++++++++++++--------- 1 file changed, 35 insertions(+), 12 deletions(-) diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c index 90cd84e2a503..bc25995255ab 100644 --- a/tools/perf/util/metricgroup.c +++ b/tools/perf/util/metricgroup.c @@ -85,26 +85,49 @@ struct egroup { const char *metric_expr; }; -static struct perf_evsel *find_evsel(struct perf_evlist *perf_evlist, - const char **ids, - int idnum, - struct perf_evsel **metric_events) +static bool record_evsel(int *ind, struct perf_evsel **start, + int idnum, + struct perf_evsel **metric_events, + struct perf_evsel *ev) +{ + metric_events[*ind] = ev; + if (*ind == 0) + *start = ev; + if (++*ind == idnum) { + metric_events[*ind] = NULL; + return true; + } + return false; +} + +static struct perf_evsel *find_evsel_group(struct perf_evlist *perf_evlist, + const char **ids, + int idnum, + struct perf_evsel **metric_events) { struct perf_evsel *ev, *start = NULL; int ind = 0; evlist__for_each_entry (perf_evlist, ev) { + if (ev->collect_stat) + continue; if (!strcmp(ev->name, ids[ind])) { - metric_events[ind] = ev; - if (ind == 0) - start = ev; - if (++ind == idnum) { - metric_events[ind] = NULL; + if (record_evsel(&ind, &start, idnum, + metric_events, ev)) return start; - } } else { + /* + * We saw some other event that is not + * in our list of events. Discard + * the whole match and start again. + */ ind = 0; start = NULL; + if (!strcmp(ev->name, ids[ind])) { + if (record_evsel(&ind, &start, idnum, + metric_events, ev)) + return start; + } } } /* @@ -134,8 +157,8 @@ static int metricgroup__setup_events(struct list_head *groups, ret = -ENOMEM; break; } - evsel = find_evsel(perf_evlist, eg->ids, eg->idnum, - metric_events); + evsel = find_evsel_group(perf_evlist, eg->ids, eg->idnum, + metric_events); if (!evsel) { pr_debug("Cannot resolve %s: %s\n", eg->metric_name, eg->metric_expr); -- 2.30.2