osdmap: dedup pg_temp

We only deal with the case where the entire map is identical, since the
individual items are too small to make the pointer overhead worthwhile.
Too bad.  A in-memory btree-like structure would work better for this.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/osd/OSDMap.cc b/src/osd/OSDMap.cc
index fd05ce96e21..87edad3b551 100644
--- a/src/osd/OSDMap.cc
+++ b/src/osd/OSDMap.cc
@@ -605,6 +605,12 @@ void OSDMap::dedup(const OSDMap *o, OSDMap *n)
   if (oc.contents_equal(nc)) {
     n->crush = o->crush;
   }
+
+  // does pg_temp match?
+  if (o->pg_temp->size() == n->pg_temp->size()) {
+    if (*o->pg_temp == *n->pg_temp)
+      n->pg_temp = o->pg_temp;
+  }
 }
 
 int OSDMap::apply_incremental(Incremental &inc)