From: Li Wang <li.wang@kylin-cloud.com>
Date: Tue, 10 Nov 2015 09:01:47 +0000 (+0800)
Subject: osd: trivial optimization
X-Git-Tag: v10.0.1~75^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=d290b276644a890cdde5c479eb2b514c3f166b6c;p=ceph.git

osd: trivial optimization

Signed-off-by: Li Wang <li.wang@kylin-cloud.com>
---

diff --git a/src/osd/PG.cc b/src/osd/PG.cc
index 8a50060e6179..ad51c86b05d6 100644
--- a/src/osd/PG.cc
+++ b/src/osd/PG.cc
@@ -4026,12 +4026,14 @@ void PG::chunky_scrub(ThreadPool::TPHandle &handle)
 
         // walk the log to find the latest update that affects our chunk
         scrubber.subset_last_update = pg_log.get_tail();
-        for (list<pg_log_entry_t>::const_iterator p = pg_log.get_log().log.begin();
-             p != pg_log.get_log().log.end();
+        for (list<pg_log_entry_t>::const_reverse_iterator p = pg_log.get_log().log.rbegin();
+             p != pg_log.get_log().log.rend();
              ++p) {
           if (cmp(p->soid, scrubber.start, get_sort_bitwise()) >= 0 &&
-	      cmp(p->soid, scrubber.end, get_sort_bitwise()) < 0)
+	      cmp(p->soid, scrubber.end, get_sort_bitwise()) < 0) {
             scrubber.subset_last_update = p->version;
+            break;
+          }
         }
 
         // ask replicas to wait until last_update_applied >= scrubber.subset_last_update and then scan