We have prepared the flags in the packet structure, so need to copy
the related value into sample structure thus perf tool can facilitate
sample flags.
The PREV_PACKET contains the branch instruction flags and PACKET
actually contains the flags for next branch instruction. So this patch
is to set sample flags with 'etmq->prev_packet->flags'.
This patch includes two fixing up: if there has TRACE_ON packet in the
middle of instruction packets, the TRACE_ON packet indicates the trace
is discontinuous, so append the flag PERF_IP_FLAG_TRACE_END to the
previous packet; if the coming packet is exception packet or exception
return packet, also update the previous packet for exception specific
flags.
Signed-off-by: Leo Yan <leo....@linaro.org>
---
tools/perf/util/cs-etm.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 00a95d7..7e36dcf 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -655,7 +655,7 @@ static int cs_etm__synth_instruction_sample(struct
cs_etm_queue *etmq,
sample.stream_id = etmq->etm->instructions_id;
sample.period = period;
sample.cpu = etmq->packet->cpu;
- sample.flags = 0;
+ sample.flags = etmq->prev_packet->flags;
sample.insn_len = 1;
sample.cpumode = event->header.misc;
@@ -711,7 +711,7 @@ static int cs_etm__synth_branch_sample(struct cs_etm_queue
*etmq)
sample.stream_id = etmq->etm->branches_id;
sample.period = 1;
sample.cpu = etmq->packet->cpu;
- sample.flags = 0;
+ sample.flags = etmq->prev_packet->flags;
sample.cpumode = PERF_RECORD_MISC_USER;
/*
@@ -945,9 +945,13 @@ static int cs_etm__exception(struct cs_etm_queue *etmq)
* The exception packet includes the dummy address values, so don't
* swap PACKET with PREV_PACKET. This keeps PREV_PACKET to be useful
* for generating instruction and branch samples.
+ *
+ * Also update flags so can tell perf it is exception related.
*/
- if (etmq->prev_packet->sample_type == CS_ETM_RANGE)
+ if (etmq->prev_packet->sample_type == CS_ETM_RANGE) {
etmq->prev_packet->last_instr_taken_branch = true;
+ etmq->prev_packet->flags = etmq->packet->flags;
+ }
return 0;
}
@@ -965,6 +969,14 @@ static int cs_etm__flush(struct cs_etm_queue *etmq)
if (etmq->prev_packet->sample_type == CS_ETM_EMPTY)
goto swap_packet;
+ /*
+ * The start tracing packet is in the middle of instruction range
+ * packets, this means the trace is discontinuous; so need to set
+ * the previous packet flag to PERF_IP_FLAG_TRACE_END.
+ */
+ if (etmq->prev_packet->sample_type == CS_ETM_RANGE)
+ etmq->prev_packet->flags |= PERF_IP_FLAG_TRACE_END;
+
if (etmq->etm->synth_opts.last_branch &&
etmq->prev_packet->sample_type == CS_ETM_RANGE) {
/*
--
2.7.4
