From: Adrian Hunter <adrian.hun...@intel.com>
Add a function to move a selected event to the
front of the list.
This is needed because it is not possible
to use the PERF_EVENT_IOC_SET_OUTPUT IOCTL
from an Instruction Tracing event to a
non-Instruction Tracing event. Thus the
Instruction Tracing event must come first.
Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
tools/perf/util/evlist.c | 17 +++++++++++++++++
tools/perf/util/evlist.h | 3 +++
2 files changed, 20 insertions(+)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index f9dbf5f..93683bc 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1216,3 +1216,20 @@ int perf_evlist__strerror_open(struct perf_evlist
*evlist __maybe_unused,
return 0;
}
+
+void perf_evlist__to_front(struct perf_evlist *evlist,
+ struct perf_evsel *move_evsel)
+{
+ struct perf_evsel *evsel, *n;
+ LIST_HEAD(move);
+
+ if (move_evsel == perf_evlist__first(evlist))
+ return;
+
+ list_for_each_entry_safe(evsel, n, &evlist->entries, node) {
+ if (evsel->leader == move_evsel->leader)
+ list_move_tail(&evsel->node, &move);
+ }
+
+ list_splice(&move, &evlist->entries);
+}
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 8a04aae..9f64ede 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -194,5 +194,8 @@ static inline void perf_mmap__write_tail(struct perf_mmap
*md,
}
bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char
*str);
+void perf_evlist__to_front(struct perf_evlist *evlist,
+ struct perf_evsel *move_evsel);
+
#endif /* __PERF_EVLIST_H */
--
1.8.5.1
--
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