From 2788d619a6d20e994dbbdcd91ba6847744bee675 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Wed, 26 Nov 2014 16:39:31 +0100 Subject: perf session: Do not fail on processing out of order event commit f61ff6c06dc8f32c7036013ad802c899ec590607 upstream. Linus reported perf report command being interrupted due to processing of 'out of order' event, with following error: Timestamp below last timeslice flush 0x5733a8 [0x28]: failed to process type: 3 I could reproduce the issue and in my case it was caused by one CPU (mmap) being behind during record and userspace mmap reader seeing the data after other CPUs data were already stored. This is expected under some circumstances because we need to limit the number of events that we queue for reordering when we receive a PERF_RECORD_FINISHED_ROUND or when we force flush due to memory pressure. Reported-by: Linus Torvalds Signed-off-by: Jiri Olsa Acked-by: Ingo Molnar Cc: Andi Kleen Cc: Corey Ashford Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Linus Torvalds Cc: Matt Fleming Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/r/1417016371-30249-1-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo [zhangzhiqiang: backport to 3.10: - adjust context - commit f61ff6c06d struct events_stats was defined in tools/perf/util/event.h while 3.10 stable defined in tools/perf/util/hist.h. - 3.10 stable there is no pr_oe_time() which used for debug. - After the above adjustments, becomes same to the original patch: https://github.com/torvalds/linux/commit/f61ff6c06dc8f32c7036013ad802c899ec590607 ] Signed-off-by: Zhiqiang Zhang Signed-off-by: Greg Kroah-Hartman --- tools/perf/util/hist.h | 1 + tools/perf/util/session.c | 5 +++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h index 14c2fe20aa62..20764e01df16 100644 --- a/tools/perf/util/hist.h +++ b/tools/perf/util/hist.h @@ -34,6 +34,7 @@ struct events_stats { u32 nr_invalid_chains; u32 nr_unknown_id; u32 nr_unprocessable_samples; + u32 nr_unordered_events; }; enum hist_column { diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index e392202b96bc..6f593a704ea5 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -656,8 +656,7 @@ static int perf_session_queue_event(struct perf_session *s, union perf_event *ev return -ETIME; if (timestamp < s->ordered_samples.last_flush) { - printf("Warning: Timestamp below last timeslice flush\n"); - return -EINVAL; + s->stats.nr_unordered_events++; } if (!list_empty(sc)) { @@ -1057,6 +1056,8 @@ static void perf_session__warn_about_errors(const struct perf_session *session, "Do you have a KVM guest running and not using 'perf kvm'?\n", session->stats.nr_unprocessable_samples); } + if (session->stats.nr_unordered_events != 0) + ui__warning("%u out of order events recorded.\n", session->stats.nr_unordered_events); } #define session_done() (*(volatile int *)(&session_done)) -- cgit v1.2.3