libperf: Move the pollfd allocation from tools/perf to libperf

It's needed in libperf only, so move it to the perf_evlist__mmap_ops()
function.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20191007125344.14268-24-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/evlist.c

@@ -34,6 +34,7 @@ void perf_evlist__init(struct perf_evlist *evlist)
 		INIT_HLIST_HEAD(&evlist->heads[i]);
 	INIT_LIST_HEAD(&evlist->entries);
 	evlist->nr_entries = 0;
+	fdarray__init(&evlist->pollfd, 64);
 }
 
 static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
@@ -114,6 +115,7 @@ void perf_evlist__delete(struct perf_evlist *evlist)
 		return;
 
 	perf_evlist__munmap(evlist);
+	fdarray__exit(&evlist->pollfd);
 	free(evlist);
 }
 
@@ -525,6 +527,9 @@ int perf_evlist__mmap_ops(struct perf_evlist *evlist,
 			return -ENOMEM;
 	}
 
+	if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
+		return -ENOMEM;
+
 	if (perf_cpu_map__empty(cpus))
 		return mmap_per_thread(evlist, ops, mp);
 

tools/perf/util/evlist.c

@@ -58,7 +58,6 @@ void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
 {
 	perf_evlist__init(&evlist->core);
 	perf_evlist__set_maps(&evlist->core, cpus, threads);
-	fdarray__init(&evlist->core.pollfd, 64);
 	evlist->workload.pid = -1;
 	evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
 }
@@ -829,9 +828,6 @@ int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
 	if (!evlist->mmap)
 		return -ENOMEM;
 
-	if (evlist->core.pollfd.entries == NULL && perf_evlist__alloc_pollfd(&evlist->core) < 0)
-		return -ENOMEM;
-
 	evlist->core.mmap_len = evlist__mmap_size(pages);
 	pr_debug("mmap size %zuB\n", evlist->core.mmap_len);
 	mp.core.mask = evlist->core.mmap_len - page_size - 1;