From: Jianpeng Ma <jianpeng.ma@intel.com>
Date: Fri, 7 Dec 2018 03:13:09 +0000 (+0800)
Subject: osd/OSD: preallocate for _get_pgs/_get_pgids to avoid reallocate.
X-Git-Tag: v14.1.0~674^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F25434%2Fhead;p=ceph.git

osd/OSD: preallocate for _get_pgs/_get_pgids to avoid reallocate.

num_pgs is the most accurate value fore reserve when call _get_pgs &
_get_pgids.

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

diff --git a/src/osd/OSD.cc b/src/osd/OSD.cc
index 3bdf8938fb2b..c172fef223ee 100644
--- a/src/osd/OSD.cc
+++ b/src/osd/OSD.cc
@@ -3983,6 +3983,7 @@ PG* OSD::_make_pg(
 void OSD::_get_pgs(vector<PGRef> *v, bool clear_too)
 {
   v->clear();
+  v->reserve(get_num_pgs());
   for (auto& s : shards) {
     std::lock_guard l(s->shard_lock);
     for (auto& j : s->pg_slots) {
@@ -4000,6 +4001,7 @@ void OSD::_get_pgs(vector<PGRef> *v, bool clear_too)
 void OSD::_get_pgids(vector<spg_t> *v)
 {
   v->clear();
+  v->reserve(get_num_pgs());
   for (auto& s : shards) {
     std::lock_guard l(s->shard_lock);
     for (auto& j : s->pg_slots) {