Hi Leo
On Mon, 3 Feb 2020 at 01:52, Leo Yan leo.yan@linaro.org wrote:
If use option '--itrace=iNNN' with Arm CoreSight trace data, perf tool fails inject instruction samples; the root cause is the packets are only switched for branch samples and last branches but not for instruction samples, so the new coming packets cannot be properly handled for only synthesizing instruction samples.
To fix this issue, this patch switches packets for instruction samples.
Signed-off-by: Leo Yan leo.yan@linaro.org
tools/perf/util/cs-etm.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index 5471045ebf5c..3dd5ba34a2c2 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -1404,7 +1404,8 @@ static int cs_etm__sample(struct cs_etm_queue *etmq, } }
if (etm->sample_branches || etm->synth_opts.last_branch) {
if (etm->sample_branches || etm->synth_opts.last_branch ||etm->sample_instructions) { /* * Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for * the next incoming packet.@@ -1476,7 +1477,8 @@ static int cs_etm__flush(struct cs_etm_queue *etmq, }
swap_packet:
if (etm->sample_branches || etm->synth_opts.last_branch) {
if (etm->sample_branches || etm->synth_opts.last_branch ||etm->sample_instructions) { /* * Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for * the next incoming packet.-- 2.17.1
if is worth putting the 'if <options> { swap packet }' into a separate function as it appears twice in identical form? Might help if more options for swap packet are needed later.
Either way
Reviewed by: Mike Leach mike.leach@linaro.org