perf session: Do not fail on processing out of order event
authorJiri Olsa <jolsa@kernel.org>
Wed, 26 Nov 2014 15:39:31 +0000 (16:39 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 16 Jan 2015 14:59:03 +0000 (06:59 -0800)
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>
tools/perf/util/hist.h
tools/perf/util/session.c

index 14c2fe20aa628cc53fc969d69ebc9466ca4274f2..20764e01df168f2cb8ec7b6a62740aa297365e50 100644 (file)
@@ -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 {
index e392202b96bc2fc4291b55cd9678090da74cb579..6f593a704ea5621a167ae7d6c784662a2e4233f0 100644 (file)
@@ -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))