diff --git a/src/mds/CInode.h b/src/mds/CInode.h
index 537d98760e7..152456e8252 100644
--- a/src/mds/CInode.h
+++ b/src/mds/CInode.h
@@ -560,7 +560,7 @@ public:
 
   // -- distributed state --
 protected:
-  // file capabilities FIXME Capability not part of mempool
+  // file capabilities
   using cap_map = mempool::mds_co::map<client_t, Capability*>;
   cap_map client_caps;         // client -> caps
   mempool::mds_co::compact_map<int32_t, int32_t>      mds_caps_wanted;     // [auth] mds -> caps wanted
diff --git a/src/mds/Capability.cc b/src/mds/Capability.cc
index 03fcefaa10e..78c531865d8 100644
--- a/src/mds/Capability.cc
+++ b/src/mds/Capability.cc
@@ -175,9 +175,9 @@ void Capability::dump(Formatter *f) const
   f->dump_unsigned("pending", _pending);
 
   f->open_array_section("revokes");
-  for (list<revoke_info>::const_iterator p = _revokes.begin(); p != _revokes.end(); ++p) {
+  for (const auto &r : _revokes) {
     f->open_object_section("revoke");
-    p->dump(f);
+    r.dump(f);
     f->close_section();
   }
   f->close_section();
@@ -191,12 +191,18 @@ void Capability::generate_test_instances(list<Capability*>& ls)
   ls.back()->last_issue_stamp = utime_t(12, 13);
   ls.back()->_wanted = 14;
   ls.back()->_pending = 15;
-  ls.back()->_revokes.push_back(revoke_info());
-  ls.back()->_revokes.back().before = 16;
-  ls.back()->_revokes.back().seq = 17;
-  ls.back()->_revokes.back().last_issue = 18;
-  ls.back()->_revokes.push_back(revoke_info());
-  ls.back()->_revokes.back().before = 19;
-  ls.back()->_revokes.back().seq = 20;
-  ls.back()->_revokes.back().last_issue = 21;
+  {
+    auto &r = ls.back()->_revokes.emplace_back();
+    r.before = 16;
+    r.seq = 17;
+    r.last_issue = 18;
+  }
+  {
+    auto &r = ls.back()->_revokes.emplace_back();
+    r.before = 19;
+    r.seq = 20;
+    r.last_issue = 21;
+  }
 }
+
+MEMPOOL_DEFINE_OBJECT_FACTORY(Capability, co_cap, mds_co);
diff --git a/src/mds/Capability.h b/src/mds/Capability.h
index 3543efee849..2934ab9ebd7 100644
--- a/src/mds/Capability.h
+++ b/src/mds/Capability.h
@@ -16,14 +16,16 @@
 #ifndef CEPH_CAPABILITY_H
 #define CEPH_CAPABILITY_H
 
-#include "include/counter.h"
 #include "include/buffer_fwd.h"
+#include "include/counter.h"
+#include "include/mempool.h"
 #include "include/xlist.h"
 
 #include "common/config.h"
 
 #include "mdstypes.h"
 
+
 /*
 
   Capability protocol notes.
@@ -66,6 +68,8 @@ namespace ceph {
 
 class Capability : public Counter<Capability> {
 public:
+  MEMPOOL_CLASS_HELPERS();
+
   struct Export {
     int64_t cap_id;
     int32_t wanted;
@@ -138,7 +142,7 @@ public:
   ceph_seq_t issue(unsigned c) {
     if (_pending & ~c) {
       // revoking (and maybe adding) bits.  note caps prior to this revocation
-      _revokes.push_back(revoke_info(_pending, last_sent, last_issue));
+      _revokes.emplace_back(_pending, last_sent, last_issue);
       _pending = c;
       _issued |= c;
     } else if (~_pending & c) {
@@ -166,8 +170,9 @@ public:
   }
   void _calc_issued() {
     _issued = _pending;
-    for (list<revoke_info>::iterator p = _revokes.begin(); p != _revokes.end(); ++p)
-      _issued |= p->before;
+    for (const auto &r : _revokes) {
+      _issued |= r.before;
+    }
   }
   void confirm_receipt(ceph_seq_t seq, unsigned caps) {
     if (seq == last_sent) {
@@ -345,7 +350,7 @@ private:
   //  - add new caps to _pending
   //  - track revocations in _revokes list
   __u32 _pending, _issued;
-  list<revoke_info> _revokes;
+  mempool::mds_co::list<revoke_info> _revokes;
 
   ceph_seq_t last_sent;
   ceph_seq_t last_issue;