Messages in this thread Patch in this message | | | From | Adrian Hunter <> | Subject | [PATCH V2 01/12] perf auxtrace: Add Z itrace option for timeless decoding | Date | Fri, 30 Apr 2021 10:02:58 +0300 |
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Issues correlating timestamps can be avoided with timeless decoding. Add an option for that, so that timeless decoding can be used even when timestamps are present.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> --- tools/perf/Documentation/itrace.txt | 1 + tools/perf/util/auxtrace.c | 3 +++ tools/perf/util/auxtrace.h | 2 ++ 3 files changed, 6 insertions(+)
diff --git a/tools/perf/Documentation/itrace.txt b/tools/perf/Documentation/itrace.txt index 0f1005209a2b..2d586fe5e4c5 100644 --- a/tools/perf/Documentation/itrace.txt +++ b/tools/perf/Documentation/itrace.txt @@ -20,6 +20,7 @@ L synthesize last branch entries on existing event records s skip initial number of events q quicker (less detailed) decoding + Z prefer to ignore timestamps (so-called "timeless" decoding) The default is all events i.e. the same as --itrace=ibxwpe, except for perf script where it is --itrace=ce diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c index 5b6ccb90b397..48b88e2bca1e 100644 --- a/tools/perf/util/auxtrace.c +++ b/tools/perf/util/auxtrace.c @@ -1569,6 +1569,9 @@ int itrace_parse_synth_opts(const struct option *opt, const char *str, case 'q': synth_opts->quick += 1; break; + case 'Z': + synth_opts->timeless_decoding = true; + break; case ' ': case ',': break; diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h index a4fbb33b7245..59c3c05384a4 100644 --- a/tools/perf/util/auxtrace.h +++ b/tools/perf/util/auxtrace.h @@ -89,6 +89,7 @@ enum itrace_period_type { * @tlb: whether to synthesize TLB events * @remote_access: whether to synthesize remote access events * @mem: whether to synthesize memory events + * @timeless_decoding: prefer "timeless" decoding i.e. ignore timestamps * @callchain_sz: maximum callchain size * @last_branch_sz: branch context size * @period: 'instructions' events period @@ -128,6 +129,7 @@ struct itrace_synth_opts { bool tlb; bool remote_access; bool mem; + bool timeless_decoding; unsigned int callchain_sz; unsigned int last_branch_sz; unsigned long long period; -- 2.25.1
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