@@ -54,6 +54,7 @@ struct cs_etm_auxtrace {
u8 sample_instructions;
int num_cpu;
+ u64 latest_kernel_timestamp;
u32 auxtrace_type;
u64 branches_sample_type;
u64 branches_id;
@@ -1192,6 +1193,8 @@ static int cs_etm__synth_instruction_sample(struct cs_etm_queue *etmq,
event->sample.header.misc = cs_etm__cpu_mode(etmq, addr);
event->sample.header.size = sizeof(struct perf_event_header);
+ if (!etm->timeless_decoding)
+ sample.time = etm->latest_kernel_timestamp;
sample.ip = addr;
sample.pid = tidq->pid;
sample.tid = tidq->tid;
@@ -1248,6 +1251,8 @@ static int cs_etm__synth_branch_sample(struct cs_etm_queue *etmq,
event->sample.header.misc = cs_etm__cpu_mode(etmq, ip);
event->sample.header.size = sizeof(struct perf_event_header);
+ if (!etm->timeless_decoding)
+ sample.time = etm->latest_kernel_timestamp;
sample.ip = ip;
sample.pid = tidq->pid;
sample.tid = tidq->tid;
@@ -2412,9 +2417,15 @@ static int cs_etm__process_event(struct perf_session *session,
else if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE)
return cs_etm__process_switch_cpu_wide(etm, event);
- if (!etm->timeless_decoding &&
- event->header.type == PERF_RECORD_AUX)
+ if (!etm->timeless_decoding && event->header.type == PERF_RECORD_AUX) {
+ /*
+ * Record the latest kernel timestamp available in the header
+ * for samples so that synthesised samples occur from this point
+ * onwards.
+ */
+ etm->latest_kernel_timestamp = sample_kernel_timestamp;
return cs_etm__process_queues(etm);
+ }
return 0;
}
The following attribute is set when synthesising samples in timed decoding mode: attr.sample_type |= PERF_SAMPLE_TIME; This results in new samples that appear to have timestamps but because we don't assign any timestamps to the samples, when the resulting inject file is opened again, the synthesised samples will be on the wrong side of the MMAP or COMM events. For example, this results in the samples being associated with the perf binary, rather than the target of the record: perf record -e cs_etm/@tmc_etr0/u top perf inject -i perf.data -o perf.inject --itrace=i100il perf report -i perf.inject Where 'Command' == perf should show as 'top': # Overhead Command Source Shared Object Source Symbol Target Symbol Basic Block Cycles # ........ ....... .................... ...................... ...................... .................. # 31.08% perf [unknown] [.] 0x000000000040c3f8 [.] 0x000000000040c3e8 - If the perf.data file is opened directly with perf, without the inject step, then this already works correctly because the events are synthesised after the COMM and MMAP events and no second sorting happens. Re-sorting only happens when opening the perf.inject file for the second time so timestamps are needed. Using the timestamp from the AUX record mirrors the current behaviour when opening directly with perf, because the events are generated on the call to cs_etm__process_queues(). The ETM trace could optionally contain time stamps, but there is no way to correlate this with the kernel time. So, the best available time value is that of the AUX_RECORD header. This patch uses the timestamp from the header for all the samples. The ordering of the samples are implicit in the trace and thus is fine with respect to relative ordering. Acked-by: Suzuki K Poulos <suzuki.poulose@arm.com> Reviewed-by: Leo Yan <leo.yan@linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Co-developed-by: Al Grant <al.grant@arm.com> Signed-off-by: Al Grant <al.grant@arm.com> Signed-off-by: James Clark <james.clark@arm.com> --- tools/perf/util/cs-etm.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)