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authorJiri Olsa <jolsa@kernel.org>2014-11-26 16:39:31 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-16 06:59:34 -0800
commitceaefcdf2a9f24835691d58d45c5cc50d596a7d0 (patch)
treebd6b6bfeb98c0d1428b89583008aac5ac65b8295
parentc8af8989238dd365808ddc3606dc458b089597d3 (diff)
downloadlinux-linaro-stable-ceaefcdf2a9f24835691d58d45c5cc50d596a7d0.tar.gz
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 <torvalds@linux-foundation.org> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Ingo Molnar <mingo@kernel.org> Cc: Andi Kleen <ak@linux.intel.com> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt.fleming@intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1417016371-30249-1-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> [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 <zhangzhiqiang.zhang@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--tools/perf/util/hist.h1
-rw-r--r--tools/perf/util/session.c5
2 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index a59743fa3ef7..0001c9aa8b71 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -36,6 +36,7 @@ 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 5da6ce74c676..c1f20e91f968 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -638,8 +638,7 @@ int perf_session_queue_event(struct perf_session *s, union perf_event *event,
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)) {
@@ -1135,6 +1134,8 @@ 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);
}
volatile int session_done;