The itrace "e" option may be followed by flags which affect what errors
will or will not be reported. Each flag must be preceded by either '+' or '-'.
The flags supported by Intel PT are:
-o Suppress overflow errors
-l Suppress trace data lost errors
For example, for errors but not overflow or data lost errors:
--itrace=e-o-l
Suppressing those errors can be useful for testing and debugging
because they are not due to decoding.
Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
tools/perf/Documentation/perf-intel-pt.txt | 9 ++++++++-
tools/perf/util/intel-pt.c | 9 +++++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/tools/perf/Documentation/perf-intel-pt.txt
b/tools/perf/Documentation/perf-intel-pt.txt
index f4cd49a7fcdb..20ac592a2641 100644
--- a/tools/perf/Documentation/perf-intel-pt.txt
+++ b/tools/perf/Documentation/perf-intel-pt.txt
@@ -871,7 +871,14 @@ Developer Manuals.
Error events show where the decoder lost the trace. Error events
are quite important. Users must know if what they are seeing is a complete
-picture or not.
+picture or not. The "e" option may be followed by flags which affect what
errors
+will or will not be reported. Each flag must be preceded by either '+' or '-'.
+The flags supported by Intel PT are:
+ -o Suppress overflow errors
+ -l Suppress trace data lost errors
+For example, for errors but not overflow or data lost errors:
+
+ --itrace=e-o-l
The "d" option will cause the creation of a file "intel_pt.log" containing all
decoded packets and instructions. Note that this option slows down the decoder
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index f09d4cfcd0fd..a1cb6a284a2b 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1862,6 +1862,15 @@ static int intel_pt_synth_error(struct intel_pt *pt, int
code, int cpu,
char msg[MAX_AUXTRACE_ERROR_MSG];
int err;
+ if (pt->synth_opts.error_minus_flags) {
+ if (code == INTEL_PT_ERR_OVR &&
+ pt->synth_opts.error_minus_flags &
AUXTRACE_ERR_FLG_OVERFLOW)
+ return 0;
+ if (code == INTEL_PT_ERR_LOST &&
+ pt->synth_opts.error_minus_flags &
AUXTRACE_ERR_FLG_DATA_LOST)
+ return 0;
+ }
+
intel_pt__strerror(code, msg, MAX_AUXTRACE_ERROR_MSG);
auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
--
2.17.1
