@@ -331,7 +331,7 @@ static int read_counter(struct perf_evsel *counter)
return 0;
}
-static void read_counters(bool close_counters)
+static void read_counters(void)
{
struct perf_evsel *counter;
@@ -341,11 +341,6 @@ static void read_counters(bool close_counters)
if (perf_stat_process_counter(&stat_config, counter))
pr_warning("failed to process counter %s\n", counter->name);
-
- if (close_counters) {
- perf_evsel__close_fd(counter, perf_evsel__nr_cpus(counter),
- thread_map__nr(evsel_list->threads));
- }
}
}
@@ -353,7 +348,7 @@ static void process_interval(void)
{
struct timespec ts, rs;
- read_counters(false);
+ read_counters();
clock_gettime(CLOCK_MONOTONIC, &ts);
diff_timespec(&rs, &ts, &ref_time);
@@ -380,6 +375,17 @@ static void enable_counters(void)
perf_evlist__enable(evsel_list);
}
+static void disable_counters(void)
+{
+ /*
+ * If we don't have tracee (attaching to task or cpu), counters may
+ * still be running. To get accurate group ratios, we must stop groups
+ * from counting before reading their constituent counters.
+ */
+ if (!target__none(&target))
+ perf_evlist__disable(evsel_list);
+}
+
static volatile int workload_exec_errno;
/*
@@ -657,11 +663,20 @@ try_again:
}
}
+ disable_counters();
+
t1 = rdclock();
update_stats(&walltime_nsecs_stats, t1 - t0);
- read_counters(true);
+ /*
+ * Closing a group leader splits the group, and as we only disable
+ * group leaders, results in remaining events becoming enabled. To
+ * avoid arbitrary skew, we must read all counters before closing any
+ * group leaders.
+ */
+ read_counters();
+ perf_evlist__close(evsel_list);
return WEXITSTATUS(status);
}
When we don't have a tracee (i.e. we're attaching to a task or CPU), counters can still be running after our workload finishes, and can still be running as we read their values. As we read events one-by-one, there can be arbitrary skew between values of events, even within a group. This means that ratios within an event group are not reliable. This skew can be seen if measuring a group of identical events, e.g: # perf stat -a -C0 -e '{cycles,cycles}' sleep 1 To avoid this, we must stop groups from counting before we read the values of any constituent events. This patch adds and makes use of a new disable_counters() helper, which disables group leaders (and thus each group as a whole). This mirrors the use of enable_counters() for starting event groups in the absence of a tracee. Closing a group leader splits the group, and without a disabled group leader the newly split events will begin counting. Thus to ensure counts are reliable we must defer closing group leaders until all counts have been read. To do so this patch removes the event closing logic from the read_counters() helper, explicitly closes the events using perf_evlist__close(), which also aids legibility. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-kernel@vger.kernel.org --- tools/perf/builtin-stat.c | 31 +++++++++++++++++++++++-------- 1 file changed, 23 insertions(+), 8 deletions(-) Note: there is also a kernel-side issue which adds skew to group counts, which is addressed by [1]. In the absence of [1], this patch minimises skew, but does not remove it entirely. Since v1 [2]: * Close events using perf_evlist__close(), per Arnaldo's comment. Mark. [1] http://lkml.kernel.org/r/1469553141-28314-1-git-send-email-mark.rutland@arm.com [2] http://lkml.kernel.org/r/1470654983-10574-1-git-send-email-mark.rutland@arm.com -- 1.9.1