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perf intel-pt: Use itrace error flags to suppress some errors

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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.hunter@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20200710151104.15137-7-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2020-07-10 18:10:58 +03:00 committed by Arnaldo Carvalho de Melo
parent cb971438b7
commit 1d846aeb86
2 changed files with 17 additions and 1 deletions
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9
tools/perf/Documentation/perf-intel-pt.txt
View File

@ -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

9
tools/perf/util/intel-pt.c
View File

@ -1863,6 +1863,15 @@ 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,