perf stat: Don't remove all grouped events when CPU maps disagree

If the events in an evlist's CPU map differ then the entire group is
removed. For example:

```
$ perf stat -e '{imc_free_running/data_read/,imc_free_running/data_write/,cs}' -a sleep 1
WARNING: grouped events cpus do not match, disabling group:
  anon group { imc_free_running/data_read/, imc_free_running/data_write/, cs }
```

Change the behavior so that just the events not matching the leader
are removed. So in the example above, just 'cs' will be removed.

Modify the warning so that it is produced once for each group, rather
than once for the entire evlist. Shrink the scope and size of the
warning text buffer.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kim Phillips <kim.phillips@amd.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Steinar H. Gunderson <sesse@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20230312021543.3060328-2-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-stat.c

@@ -181,14 +181,13 @@ static bool cpus_map_matched(struct evsel *a, struct evsel *b)
 
 static void evlist__check_cpu_maps(struct evlist *evlist)
 {
-	struct evsel *evsel, *pos, *leader;
-	char buf[1024];
+	struct evsel *evsel, *warned_leader = NULL;
 
 	if (evlist__has_hybrid(evlist))
 		evlist__warn_hybrid_group(evlist);
 
 	evlist__for_each_entry(evlist, evsel) {
-		leader = evsel__leader(evsel);
+		struct evsel *leader = evsel__leader(evsel);
 
 		/* Check that leader matches cpus with each member. */
 		if (leader == evsel)
@@ -197,19 +196,26 @@ static void evlist__check_cpu_maps(struct evlist *evlist)
 			continue;
 
 		/* If there's mismatch disable the group and warn user. */
-		WARN_ONCE(1, "WARNING: grouped events cpus do not match, disabling group:\n");
+		if (warned_leader != leader) {
+			char buf[200];
+
+			pr_warning("WARNING: grouped events cpus do not match.\n"
+				"Events with CPUs not matching the leader will "
+				"be removed from the group.\n");
 			evsel__group_desc(leader, buf, sizeof(buf));
 			pr_warning("  %s\n", buf);
-
+			warned_leader = leader;
+		}
 		if (verbose > 0) {
+			char buf[200];
+
 			cpu_map__snprint(leader->core.cpus, buf, sizeof(buf));
 			pr_warning("     %s: %s\n", leader->name, buf);
 			cpu_map__snprint(evsel->core.cpus, buf, sizeof(buf));
 			pr_warning("     %s: %s\n", evsel->name, buf);
 		}
 
-		for_each_group_evsel(pos, leader)
-			evsel__remove_from_group(pos, leader);
+		evsel__remove_from_group(evsel, leader);
 	}
 }