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-rw-r--r--tools/perf/util/data.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index fc16299c91..c29d8a382b 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -17,6 +17,7 @@
#include "util.h" // rm_rf_perf_data()
#include "debug.h"
#include "header.h"
+#include "rlimit.h"
#include <internal/lib.h>
static void close_dir(struct perf_data_file *files, int nr)
@@ -35,6 +36,7 @@ void perf_data__close_dir(struct perf_data *data)
int perf_data__create_dir(struct perf_data *data, int nr)
{
+ enum rlimit_action set_rlimit = NO_CHANGE;
struct perf_data_file *files = NULL;
int i, ret;
@@ -54,11 +56,21 @@ int perf_data__create_dir(struct perf_data *data, int nr)
goto out_err;
}
+retry_open:
ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
if (ret < 0) {
+ /*
+ * If using parallel threads to collect data,
+ * perf record needs at least 6 fds per CPU.
+ * When we run out of them try to increase the limits.
+ */
+ if (errno == EMFILE && rlimit__increase_nofile(&set_rlimit))
+ goto retry_open;
+
ret = -errno;
goto out_err;
}
+ set_rlimit = NO_CHANGE;
file->fd = ret;
}