perf intel-pt: Fix snapshot overlap detection decoder errors

Fix occasional decoder errors decoding trace data collected in snapshot
mode.

Snapshot mode can take successive snapshots of trace which might overlap.
The decoder checks whether there is an overlap but only looks at the
current and previous buffer. However buffers that do not contain
synchronization (i.e. PSB) packets cannot be decoded or used for overlap
checking. That means the decoder actually needs to check overlaps between
the current buffer and the previous buffer that contained usable data.
Make that change.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: stable@vger.kernel.org # v4.3+
Link: http://lkml.kernel.org/r/1474641528-18776-10-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index b9cc353cace211d5cff3508c779ca083b4691010..b744ea812a2e407e931310c740cf982e9587cbee 100644 (file)
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -241,7 +241,7 @@ static int intel_pt_get_trace(struct intel_pt_buffer *b, void *data)
        }
 
        queue = &ptq->pt->queues.queue_array[ptq->queue_nr];
-
+next:
        buffer = auxtrace_buffer__next(queue, buffer);
        if (!buffer) {
                if (old_buffer)
@@ -264,9 +264,6 @@ static int intel_pt_get_trace(struct intel_pt_buffer *b, void *data)
            intel_pt_do_fix_overlap(ptq->pt, old_buffer, buffer))
                return -ENOMEM;
 
-       if (old_buffer)
-               auxtrace_buffer__drop_data(old_buffer);
-
        if (buffer->use_data) {
                b->len = buffer->use_size;
                b->buf = buffer->use_data;
@@ -276,6 +273,16 @@ static int intel_pt_get_trace(struct intel_pt_buffer *b, void *data)
        }
        b->ref_timestamp = buffer->reference;
 
+       /*
+        * If in snapshot mode and the buffer has no usable data, get next
+        * buffer and again check overlap against old_buffer.
+        */
+       if (ptq->pt->snapshot_mode && !b->len)
+               goto next;
+
+       if (old_buffer)
+               auxtrace_buffer__drop_data(old_buffer);
+
        if (!old_buffer || ptq->pt->sampling_mode || (ptq->pt->snapshot_mode &&
                                                      !buffer->consecutive)) {
                b->consecutive = false;