Merge pull request ceph#18804 from majianpeng/bluestore-collection-pr…

…ealloc os/bluestore: Prealloc memory avoid realloc in list_collection. Reviewed-by: Sage Weil <[email protected]>
keivnhuang · Feb 9, 2018 · 34c3af4 · 34c3af4
2 parents 7894961 + d3d04ab
commit 34c3af4
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
@@ -7196,6 +7196,7 @@ int BlueStore::getattrs(
 int BlueStore::list_collections(vector<coll_t>& ls)
 {
   RWLock::RLocker l(coll_lock);
+  ls.reserve(coll_map.size());
   for (ceph::unordered_map<coll_t, CollectionRef>::iterator p = coll_map.begin();
        p != coll_map.end();
        ++p)