| From | Alexander Shishkin <> | Subject | [PATCH v0 23/71] perf evlist: Add perf_evlist__to_front() | Date | Wed, 11 Dec 2013 14:36:35 +0200 |
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From: Adrian Hunter <adrian.hunter@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.hunter@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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