[PATCH V3 23/25] perf tools: Intel PT to always update thread stack trace number

Adrian Hunter
2015-04-24T19:33:30Z

The enhanced thread stack is used by higher layers but still
requires the trace number. The trace number is used to
distinguish discontinuous sections of trace (for example
from Snapshot mode or Sample mode), which cause the thread
stack to be flushed.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/util/intel-pt.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index cf6b442..b7c5578 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -265,7 +265,7 @@ static int intel_pt_get_trace(struct intel_pt_buffer *b, void *data)
if (!old_buffer || ptq->pt->sampling_mode || (ptq->pt->snapshot_mode &&
!buffer->consecutive)) {
b->consecutive = false;
- b->trace_nr = buffer->buffer_nr;
+ b->trace_nr = buffer->buffer_nr + 1;
} else {
b->consecutive = true;
}
@@ -1065,6 +1065,8 @@ static int intel_pt_sample(struct intel_pt_queue *ptq)
thread_stack__event(ptq->thread, ptq->flags, state->from_ip,
state->to_ip, ptq->insn_len,
state->trace_nr);
+ else
+ thread_stack__set_trace_nr(ptq->thread, state->trace_nr);

if (pt->sample_branches) {
err = intel_pt_synth_branch_sample(ptq);
--
1.9.1