From: Zac Medico <zmedico@gmail.com>
Date: Mon, 21 Aug 2017 20:30:53 +0000 (-0700)
Subject: PGPool::update: optimize with interval_set.swap
X-Git-Tag: v12.2.9~118^2~3
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=d68cff3deae6294f53f21606b81f0cfaeb76b271;p=ceph.git

PGPool::update: optimize with interval_set.swap

Use constant complexity swap instead of linear complexity
assignment.

Signed-off-by: Zac Medico <zmedico@gmail.com>
(cherry picked from commit ae64179a63351ac3966e70a074776188ddba5b84)
---

diff --git a/src/osd/PG.cc b/src/osd/PG.cc
index 9e45796b89a7..04f2d92828d9 100644
--- a/src/osd/PG.cc
+++ b/src/osd/PG.cc
@@ -247,7 +247,7 @@ void PGPool::update(OSDMapRef map)
         lgeneric_subdout(cct, osd, 0) << __func__
           << " cached_removed_snaps shrank from " << cached_removed_snaps
           << " to " << newly_removed_snaps << dendl;
-        cached_removed_snaps = newly_removed_snaps;
+        cached_removed_snaps.swap(newly_removed_snaps);
         newly_removed_snaps.clear();
     }
     snapc = pi->get_snap_context();