| From be80ff79760eeee079aa9dc8a2eb9ce00de45dda Mon Sep 17 00:00:00 2001 |
| From: Adrian Hunter <adrian.hunter@intel.com> |
| Date: Fri, 30 Apr 2021 10:02:58 +0300 |
| Subject: [PATCH] perf auxtrace: Add Z itrace option for timeless decoding |
| |
| 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> |
| Reviewed-by: Andi Kleen <ak@linux.intel.com> |
| Cc: Jiri Olsa <jolsa@redhat.com> |
| Link: https://lore.kernel.org/r/20210430070309.17624-2-adrian.hunter@intel.com |
| Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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 c2182cbabde3..24a345a77c32 100644 |
| --- a/tools/perf/Documentation/itrace.txt |
| +++ b/tools/perf/Documentation/itrace.txt |
| @@ -10,6 +10,7 @@ |
| g synthesize a call chain (use with i or x) |
| l synthesize last branch entries (use with i or x) |
| s skip initial number of events |
| + 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 ec0af36697c4..9fb238706809 100644 |
| --- a/tools/perf/util/auxtrace.c |
| +++ b/tools/perf/util/auxtrace.c |
| @@ -1114,6 +1114,9 @@ int itrace_parse_synth_opts(const struct option *opt, const char *str, |
| goto out_err; |
| p = endptr; |
| 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 e9b4c5edf78b..a612ba746318 100644 |
| --- a/tools/perf/util/auxtrace.h |
| +++ b/tools/perf/util/auxtrace.h |
| @@ -68,6 +68,7 @@ enum itrace_period_type { |
| * @callchain: add callchain to 'instructions' events |
| * @thread_stack: feed branches to the thread_stack |
| * @last_branch: add branch context to 'instruction' 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 |
| @@ -94,6 +95,7 @@ struct itrace_synth_opts { |
| bool callchain; |
| bool thread_stack; |
| bool last_branch; |
| + bool timeless_decoding; |
| unsigned int callchain_sz; |
| unsigned int last_branch_sz; |
| unsigned long long period; |
| -- |
| 2.32.0.605.g8dce9f2422-goog |
| |
