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-rw-r--r--tools/perf/util/evsel.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 960394ea1e3a..a29c8d03ac69 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -13,6 +13,7 @@
#include <traceevent/event-parse.h>
#include <linux/hw_breakpoint.h>
#include <linux/perf_event.h>
+#include <sys/resource.h>
#include "asm/bug.h"
#include "evsel.h"
#include "evlist.h"
@@ -867,6 +868,7 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
int cpu, thread;
unsigned long flags = 0;
int pid = -1, err;
+ enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
if (evsel->fd == NULL &&
perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
@@ -894,6 +896,7 @@ retry_sample_id:
group_fd = get_group_fd(evsel, cpu, thread);
+retry_open:
FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
pid,
cpus->map[cpu],
@@ -902,12 +905,37 @@ retry_sample_id:
err = -errno;
goto try_fallback;
}
+ set_rlimit = NO_CHANGE;
}
}
return 0;
try_fallback:
+ /*
+ * perf stat needs between 5 and 22 fds per CPU. When we run out
+ * of them try to increase the limits.
+ */
+ if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
+ struct rlimit l;
+ int old_errno = errno;
+
+ if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
+ if (set_rlimit == NO_CHANGE)
+ l.rlim_cur = l.rlim_max;
+ else {
+ l.rlim_cur = l.rlim_max + 1000;
+ l.rlim_max = l.rlim_cur;
+ }
+ if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
+ set_rlimit++;
+ errno = old_errno;
+ goto retry_open;
+ }
+ }
+ errno = old_errno;
+ }
+
if (err != -EINVAL || cpu > 0 || thread > 0)
goto out_close;