linux-kernel - [tip:perf/core] perf session: Warn when AUX data has been lost

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Date:	Tue, 29 Sep 2015 01:43:14 -0700
From:	tip-bot for Adrian Hunter <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	adrian.hunter@...el.com, jolsa@...hat.com, mingo@...nel.org,
	hpa@...or.com
Subject: [tip:perf/core] perf session: Warn when AUX data has been lost

Commit-ID:  a38f48e300f9dac30a9b2d2ce958c8dbd7def351
Gitweb:     http://git.kernel.org/tip/a38f48e300f9dac30a9b2d2ce958c8dbd7def351
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Fri, 25 Sep 2015 16:15:37 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 28 Sep 2015 16:51:33 -0300

perf session: Warn when AUX data has been lost

By default 'perf record' will postprocess the perf.data file to
determine build-ids.  When that happens, the number of lost perf events
is displayed.

Make that also happen for AUX events.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/1443186956-18718-7-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/event.h   |  1 +
 tools/perf/util/session.c | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index be5cbc7..a0dbcbd 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -257,6 +257,7 @@ struct events_stats {
 	u64 total_non_filtered_period;
 	u64 total_lost;
 	u64 total_lost_samples;
+	u64 total_aux_lost;
 	u64 total_invalid_chains;
 	u32 nr_events[PERF_RECORD_HEADER_MAX];
 	u32 nr_non_filtered_samples;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index f5e0000..15c84ca 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1101,6 +1101,9 @@ static int machines__deliver_event(struct machines *machines,
 	case PERF_RECORD_UNTHROTTLE:
 		return tool->unthrottle(tool, event, sample, machine);
 	case PERF_RECORD_AUX:
+		if (tool->aux == perf_event__process_aux &&
+		    (event->aux.flags & PERF_AUX_FLAG_TRUNCATED))
+			evlist->stats.total_aux_lost += 1;
 		return tool->aux(tool, event, sample, machine);
 	case PERF_RECORD_ITRACE_START:
 		return tool->itrace_start(tool, event, sample, machine);
@@ -1346,6 +1349,13 @@ static void perf_session__warn_about_errors(const struct perf_session *session)
 		}
 	}
 
+	if (session->tool->aux == perf_event__process_aux &&
+	    stats->total_aux_lost != 0) {
+		ui__warning("AUX data lost %" PRIu64 " times out of %u!\n\n",
+			    stats->total_aux_lost,
+			    stats->nr_events[PERF_RECORD_AUX]);
+	}
+
 	if (stats->nr_unknown_events != 0) {
 		ui__warning("Found %u unknown events!\n\n"
 			    "Is this an older tool processing a perf.data "
--
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