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changeset 20489:966205f0e717

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8058564: Tiered compilation performance drop in PIT Summary: Ensure MethodCounters are created before method is enqueued for compilation Reviewed-by: kvn, drchase, jiangli, roland
author iveresov
date Fri, 19 Sep 2014 11:53:58 -0700
parents 9c8439756c05
children 97ad90b2712c
files src/share/vm/compiler/compileBroker.cpp src/share/vm/oops/method.cpp src/share/vm/oops/method.hpp
diffstat 3 files changed, 17 insertions(+), 11 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/compiler/compileBroker.cpp	Fri Sep 19 11:12:39 2014 -0400
+++ b/src/share/vm/compiler/compileBroker.cpp	Fri Sep 19 11:53:58 2014 -0700
@@ -1175,6 +1175,12 @@
     return;
   }
 
+  if (TieredCompilation) {
+    // Tiered policy requires MethodCounters to exist before adding a method to
+    // the queue. Create if we don't have them yet.
+    method->get_method_counters(thread);
+  }
+
   // Outputs from the following MutexLocker block:
   CompileTask* task     = NULL;
   bool         blocking = false;
--- a/src/share/vm/oops/method.cpp	Fri Sep 19 11:12:39 2014 -0400
+++ b/src/share/vm/oops/method.cpp	Fri Sep 19 11:53:58 2014 -0700
@@ -93,7 +93,7 @@
   set_hidden(false);
   set_dont_inline(false);
   set_method_data(NULL);
-  set_method_counters(NULL);
+  clear_method_counters();
   set_vtable_index(Method::garbage_vtable_index);
 
   // Fix and bury in Method*
@@ -117,7 +117,7 @@
   MetadataFactory::free_metadata(loader_data, method_data());
   set_method_data(NULL);
   MetadataFactory::free_metadata(loader_data, method_counters());
-  set_method_counters(NULL);
+  clear_method_counters();
   // The nmethod will be gone when we get here.
   if (code() != NULL) _code = NULL;
 }
@@ -388,9 +388,7 @@
   methodHandle mh(m);
   ClassLoaderData* loader_data = mh->method_holder()->class_loader_data();
   MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL);
-  if (mh->method_counters() == NULL) {
-    mh->set_method_counters(counters);
-  } else {
+  if (!mh->init_method_counters(counters)) {
     MetadataFactory::free_metadata(loader_data, counters);
   }
   return mh->method_counters();
@@ -852,7 +850,7 @@
   assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?");
 
   set_method_data(NULL);
-  set_method_counters(NULL);
+  clear_method_counters();
 }
 
 // Called when the method_holder is getting linked. Setup entrypoints so the method
--- a/src/share/vm/oops/method.hpp	Fri Sep 19 11:12:39 2014 -0400
+++ b/src/share/vm/oops/method.hpp	Fri Sep 19 11:53:58 2014 -0700
@@ -365,11 +365,13 @@
     return _method_counters;
   }
 
-  void set_method_counters(MethodCounters* counters) {
-    // The store into method must be released. On platforms without
-    // total store order (TSO) the reference may become visible before
-    // the initialization of data otherwise.
-    OrderAccess::release_store_ptr((volatile void *)&_method_counters, counters);
+  void clear_method_counters() {
+    _method_counters = NULL;
+  }
+
+  bool init_method_counters(MethodCounters* counters) {
+    // Try to install a pointer to MethodCounters, return true on success.
+    return Atomic::cmpxchg_ptr(counters, (volatile void*)&_method_counters, NULL) == NULL;
   }
 
 #ifdef TIERED