From: Samuel Just <sam.just@inktank.com>
Date: Mon, 29 Sep 2014 23:26:54 +0000 (-0700)
Subject: ReplicatedPG: do not queue the snap trimmer constantly
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=01efc44adea6a16bed24fb10b67fe0cbd6a7595c;p=ceph.git

ReplicatedPG: do not queue the snap trimmer constantly

Previously, we continuously requeued the snap trimmer while in
TrimmingObjects.  This is not a good idea now that we try to
limit the number of snap trimming repops in flight and requeue
the snap trimmer directly as those repops complete.

Fixes: #9113
Backport: giant, dumpling, firefly
Signed-off-by: Samuel Just <sam.just@inktank.com>
(cherry picked from commit 34f38b68d89baf1dcbb4571d4f4d3076dc354538)

Conflicts:
	src/osd/ReplicatedPG.cc
---

diff --git a/src/osd/ReplicatedPG.cc b/src/osd/ReplicatedPG.cc
index 5bd2e0c7fc6b..e0912b6154b5 100644
--- a/src/osd/ReplicatedPG.cc
+++ b/src/osd/ReplicatedPG.cc
@@ -1738,10 +1738,6 @@ void ReplicatedPG::snap_trimmer()
     // replica collection trimming
     snap_trimmer_machine.process_event(SnapTrim());
   }
-  if (snap_trimmer_machine.requeue) {
-    dout(10) << "snap_trimmer requeue" << dendl;
-    queue_snap_trim();
-  }
   unlock();
   return;
 }
@@ -7840,13 +7836,11 @@ void ReplicatedPG::SnapTrimmer::log_exit(const char *state_name, utime_t enter_t
 ReplicatedPG::NotTrimming::NotTrimming(my_context ctx) : my_base(ctx)
 {
   state_name = "NotTrimming";
-  context< SnapTrimmer >().requeue = false;
   context< SnapTrimmer >().log_enter(state_name);
 }
 
 void ReplicatedPG::NotTrimming::exit()
 {
-  context< SnapTrimmer >().requeue = true;
   context< SnapTrimmer >().log_exit(state_name, enter_time);
 }
 
@@ -7947,7 +7941,6 @@ ReplicatedPG::WaitingOnReplicas::WaitingOnReplicas(my_context ctx) : my_base(ctx
 {
   state_name = "Trimming/WaitingOnReplicas";
   context< SnapTrimmer >().log_enter(state_name);
-  context< SnapTrimmer >().requeue = false;
 }
 
 void ReplicatedPG::WaitingOnReplicas::exit()
diff --git a/src/osd/ReplicatedPG.h b/src/osd/ReplicatedPG.h
index 617097753747..a2c3a3b90eb4 100644
--- a/src/osd/ReplicatedPG.h
+++ b/src/osd/ReplicatedPG.h
@@ -996,8 +996,7 @@ private:
     set<RepGather *> repops;
     snapid_t snap_to_trim;
     bool need_share_pg_info;
-    bool requeue;
-    SnapTrimmer(ReplicatedPG *pg) : pg(pg), need_share_pg_info(false), requeue(false) {}
+    SnapTrimmer(ReplicatedPG *pg) : pg(pg), need_share_pg_info(false) {}
     ~SnapTrimmer();
     void log_enter(const char *state_name);
     void log_exit(const char *state_name, utime_t duration);