perf evlist: Adopt the pollfd array
Allocating just the space needed for nr_cpus * nr_threads * nr_evsels,
not the MAX_NR_CPUS and counters.
LKML-Reference: <new-submission>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 216b62e..1bc4652 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1193,8 +1193,6 @@
md->prev = old;
}
-static struct pollfd *event_array;
-
static void perf_session__mmap_read(struct perf_session *self)
{
struct perf_evsel *counter;
@@ -1212,10 +1210,10 @@
}
}
-int nr_poll;
int group_fd;
-static void start_counter(int i, struct perf_evsel *evsel)
+static void start_counter(int i, struct perf_evlist *evlist,
+ struct perf_evsel *evsel)
{
struct xyarray *mmap_array = evsel->priv;
struct mmap_data *mm;
@@ -1281,9 +1279,9 @@
if (group && group_fd == -1)
group_fd = FD(evsel, i, thread_index);
- event_array[nr_poll].fd = FD(evsel, i, thread_index);
- event_array[nr_poll].events = POLLIN;
- nr_poll++;
+ evlist->pollfd[evlist->nr_fds].fd = FD(evsel, i, thread_index);
+ evlist->pollfd[evlist->nr_fds].events = POLLIN;
+ evlist->nr_fds++;
mm = xyarray__entry(mmap_array, i, thread_index);
mm->prev = 0;
@@ -1316,11 +1314,11 @@
for (i = 0; i < cpus->nr; i++) {
group_fd = -1;
list_for_each_entry(counter, &evsel_list->entries, node)
- start_counter(i, counter);
+ start_counter(i, evsel_list, counter);
}
/* Wait for a minimal set of events before starting the snapshot */
- poll(&event_array[0], nr_poll, 100);
+ poll(evsel_list->pollfd, evsel_list->nr_fds, 100);
perf_session__mmap_read(session);
@@ -1345,7 +1343,7 @@
perf_session__mmap_read(session);
if (hits == samples)
- ret = poll(event_array, nr_poll, 100);
+ ret = poll(evsel_list->pollfd, evsel_list->nr_fds, 100);
}
return 0;
@@ -1426,11 +1424,6 @@
usage_with_options(top_usage, options);
}
- event_array = malloc((sizeof(struct pollfd) *
- MAX_NR_CPUS * MAX_COUNTERS * threads->nr));
- if (!event_array)
- return -ENOMEM;
-
/* CPU and PID are mutually exclusive */
if (target_tid > 0 && cpu_list) {
printf("WARNING: PID switch overriding CPU\n");
@@ -1480,6 +1473,9 @@
pos->attr.sample_period = default_interval;
}
+ if (perf_evlist__alloc_pollfd(evsel_list, cpus->nr, threads->nr) < 0)
+ goto out_free_fd;
+
sym_evsel = list_entry(evsel_list->entries.next, struct perf_evsel, node);
symbol_conf.priv_size = (sizeof(struct sym_entry) +