From: Jianpeng Ma <jianpeng.ma@intel.com>
Date: Fri, 10 Nov 2017 15:20:26 +0000 (+0800)
Subject: os/bluestore: Prealloc memory avoid realloc in list_collection.
X-Git-Tag: v13.0.2~306^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=d3d04ab485b610ade7fd4b15822a856a18fbb756;p=ceph.git

os/bluestore: Prealloc memory avoid realloc in list_collection.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
---

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 7a86d8ea834..8ff2a209d80 100644
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -7122,6 +7122,7 @@ 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)