mds: add perf counter to track number of sessions evicted due to metadata threshold...

Signed-off-by: Venky Shankar <vshankar@redhat.com>
(cherry picked from commit 59dd587ddb3bc95a95d0fb8715511d194181ec6f)

diff --git a/src/mds/SessionMap.cc b/src/mds/SessionMap.cc
index 873dedbe68dcf975a574b977bd05e660d5800af2..9cc2b013847e276e6ed0e72034523d92adf4c781 100644 (file)
--- a/src/mds/SessionMap.cc
+++ b/src/mds/SessionMap.cc
@@ -71,6 +71,8 @@ void SessionMap::register_perfcounters()
   plb.add_u64(l_mdssm_avg_load, "average_load", "Average Load");
   plb.add_u64(l_mdssm_avg_session_uptime, "avg_session_uptime",
                "Average session uptime");
+  plb.add_u64(l_mdssm_metadata_threshold_sessions_evicted, "mdthresh_evicted",
+             "Sessions evicted on reaching metadata threshold");
 
   logger = plb.create_perf_counters();
   g_ceph_context->get_perfcounters_collection()->add(logger);
@@ -479,6 +481,7 @@ void SessionMap::save(MDSContext *onsave, version_t needv)
                        new C_OnFinisher(new C_IO_SM_Save(this, version),
                                         mds->finisher));
   apply_blocklist(to_blocklist);
+  logger->inc(l_mdssm_metadata_threshold_sessions_evicted, to_blocklist.size());
 }
 
 void SessionMap::_save_finish(version_t v)
@@ -926,6 +929,7 @@ void SessionMap::save_if_dirty(const std::set<entity_name_t> &tgt_sessions,
   }
 
   apply_blocklist(to_blocklist);
+  logger->inc(l_mdssm_metadata_threshold_sessions_evicted, to_blocklist.size());
 }
 
 // =================

diff --git a/src/mds/SessionMap.h b/src/mds/SessionMap.h
index c1c28a8455badc9886daa3f136a488a73cb911f0..360dd66a27bb5c24dc3696822d01381450cbf1c8 100644 (file)
--- a/src/mds/SessionMap.h
+++ b/src/mds/SessionMap.h
@@ -45,6 +45,7 @@ enum {
   l_mdssm_total_load,
   l_mdssm_avg_load,
   l_mdssm_avg_session_uptime,
+  l_mdssm_metadata_threshold_sessions_evicted,
   l_mdssm_last,
 };