[tip: perf/core] libperf: Introduce perf_evlist__purge()

From: tip-bot2 for Jiri Olsa
Date: Tue Oct 15 2019 - 01:36:11 EST


The following commit has been merged into the perf/core branch of tip:

Commit-ID: 696f27c994ed056fd176ce9dc51c7988e148e4b0
Gitweb: https://git.kernel.org/tip/696f27c994ed056fd176ce9dc51c7988e148e4b0
Author: Jiri Olsa <jolsa@xxxxxxxxxx>
AuthorDate: Mon, 07 Oct 2019 14:53:33 +02:00
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Thu, 10 Oct 2019 12:57:22 -03:00

libperf: Introduce perf_evlist__purge()

Add a static perf_evlist__purge() function to purge evsels from a evlist.

Add also perf_evlist__for_each_entry_safe() which is used by
perf_evlist__purge().

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Michael Petlan <mpetlan@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lore.kernel.org/lkml/20191007125344.14268-26-jolsa@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/lib/evlist.c | 13 +++++++++++++
tools/perf/lib/include/internal/evlist.h | 18 ++++++++++++++++++
2 files changed, 31 insertions(+)

diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c
index 7ba98f0..9534ad9 100644
--- a/tools/perf/lib/evlist.c
+++ b/tools/perf/lib/evlist.c
@@ -109,6 +109,18 @@ perf_evlist__next(struct perf_evlist *evlist, struct perf_evsel *prev)
return next;
}

+static void perf_evlist__purge(struct perf_evlist *evlist)
+{
+ struct perf_evsel *pos, *n;
+
+ perf_evlist__for_each_entry_safe(evlist, n, pos) {
+ list_del_init(&pos->node);
+ perf_evsel__delete(pos);
+ }
+
+ evlist->nr_entries = 0;
+}
+
void perf_evlist__exit(struct perf_evlist *evlist)
{
perf_cpu_map__put(evlist->cpus);
@@ -125,6 +137,7 @@ void perf_evlist__delete(struct perf_evlist *evlist)

perf_evlist__munmap(evlist);
perf_evlist__close(evlist);
+ perf_evlist__purge(evlist);
perf_evlist__exit(evlist);
free(evlist);
}
diff --git a/tools/perf/lib/include/internal/evlist.h b/tools/perf/lib/include/internal/evlist.h
index 0721512..be0b25a 100644
--- a/tools/perf/lib/include/internal/evlist.h
+++ b/tools/perf/lib/include/internal/evlist.h
@@ -82,6 +82,24 @@ void perf_evlist__exit(struct perf_evlist *evlist);
#define perf_evlist__for_each_entry_reverse(evlist, evsel) \
__perf_evlist__for_each_entry_reverse(&(evlist)->entries, evsel)

+/**
+ * __perf_evlist__for_each_entry_safe - safely iterate thru all the evsels
+ * @list: list_head instance to iterate
+ * @tmp: struct evsel temp iterator
+ * @evsel: struct evsel iterator
+ */
+#define __perf_evlist__for_each_entry_safe(list, tmp, evsel) \
+ list_for_each_entry_safe(evsel, tmp, list, node)
+
+/**
+ * perf_evlist__for_each_entry_safe - safely iterate thru all the evsels
+ * @evlist: evlist instance to iterate
+ * @evsel: struct evsel iterator
+ * @tmp: struct evsel temp iterator
+ */
+#define perf_evlist__for_each_entry_safe(evlist, tmp, evsel) \
+ __perf_evlist__for_each_entry_safe(&(evlist)->entries, tmp, evsel)
+
static inline struct perf_evsel *perf_evlist__first(struct perf_evlist *evlist)
{
return list_entry(evlist->entries.next, struct perf_evsel, node);