Merge pull request ceph#3889 from XinzeChi/wip-tier-stat

osd: add l_osd_op_cache_hit perf counter for cache pool

Reviewed-by: Sage Weil <[email protected]>

src/osd/OSD.cc

@@ -2169,6 +2169,8 @@ void OSD::create_logger()
   osd_plb.add_u64_counter(l_osd_object_ctx_cache_hit, "object_ctx_cache_hit", "Object context cache hits");
   osd_plb.add_u64_counter(l_osd_object_ctx_cache_total, "object_ctx_cache_total", "Object context cache lookups");
 
+  osd_plb.add_u64_counter(l_osd_op_cache_hit, "op_cache_hit");
+
   logger = osd_plb.create_perf_counters();
   cct->get_perfcounters_collection()->add(logger);
 }

src/osd/OSD.h

@@ -144,6 +144,8 @@ enum {
   l_osd_object_ctx_cache_hit,
   l_osd_object_ctx_cache_total,
 
+  l_osd_op_cache_hit,
+
   l_osd_last,
 };
 

src/osd/ReplicatedPG.cc

@@ -1872,6 +1872,7 @@ bool ReplicatedPG::maybe_handle_cache(OpRequestRef op,
   }
 
   if (obc.get() && obc->obs.exists) {
+    osd->logger->inc(l_osd_op_cache_hit);
     return false;
   }