commit b6c0867142ced63a21003b2f449b20b248e1cc4a
author Jason Evans <jasone@canonware.com> Mon Oct 03 10:37:12 2016 -0700
committer Jason Evans <jasone@canonware.com> Tue Oct 04 09:54:18 2016 -0700
tree 0b86346086ed3890b0f50f0ce9262b8671c6ac57
parent a5a8d7ae8dd638cf538cae3b340afe6d1d787954

Reduce "thread.arena" mallctl contention.

This resolves #460.

src/ctl.c

diff --git a/src/ctl.c b/src/ctl.c
index 535f1ea..87fd8c7 100644
--- a/src/ctl.c
+++ b/src/ctl.c
@@ -1186,14 +1186,13 @@
 	if (oldarena == NULL)
 		return (EAGAIN);
 
-	malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
 	newind = oldind = oldarena->ind;
 	WRITE(newind, unsigned);
 	READ(oldind, unsigned);
 	if (newind != oldind) {
 		arena_t *newarena;
 
-		if (newind >= ctl_stats.narenas) {
+		if (newind >= narenas_total_get()) {
 			/* New arena index is out of range. */
 			ret = EFAULT;
 			goto label_return;
@@ -1218,7 +1217,6 @@
 
 	ret = 0;
 label_return:
-	malloc_mutex_unlock(tsd_tsdn(tsd), &ctl_mtx);
 	return (ret);
 }