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perf tools: Fix lost and unknown events handling

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Fix it by explaining what can be happening and giving the number of processed
and lost events.

Also holler if unknown events were found, that can be due to processing a
perf.data file collected using a newer tool where newer events got added on
reporting using an older perf tool, that or a bug, so ask for a report to be
made.

Works on both --tui and --stdio.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2010-11-27 02:41:01 -02:00
parent 008f29d386
commit 068ffaa8bf
4 changed files with 46 additions and 1 deletions
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18
tools/perf/util/session.c
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@@ -852,6 +852,24 @@ done:
flush_sample_queue(self, ops);
out_err:
ui_progress__delete(progress);
if (ops->lost == event__process_lost &&
self->hists.stats.total_lost != 0) {
ui__warning("Processed %Lu events and LOST %Lu!\n\n"
"Check IO/CPU overload!\n\n",
self->hists.stats.total_period,
self->hists.stats.total_lost);
}
if (self->hists.stats.nr_unknown_events != 0) {
ui__warning("Found %u unknown events!\n\n"
"Is this an older tool processing a perf.data "
"file generated by a more recent tool?\n\n"
"If that is not the case, consider "
"reporting to linux-kernel@vger.kernel.org.\n\n",
self->hists.stats.nr_unknown_events);
}
return err;
}