commit 5496f69c0a4c2cc357a065f57b7f4ff5d9ad2fa9
author Hiroshi Yamauchi <yamauchi@google.com> Wed Feb 17 13:29:59 2016 -0800
committer Hiroshi Yamauchi <yamauchi@google.com> Thu Feb 18 16:07:54 2016 -0800
tree f87b5ff024b8f9124dfcdda3bd4ab32726d66b61
parent 88f38e9b4e9ba0aca3d6fd4823be3a7226c87f33

Disable read barriers in GC VisitReferences calls.

It's safe to disable read barriers in the CC collector's
VisitReferences calls. It speeds up the collector by some amount,
eg. Ritzperf EAAC GC time on N5 decreases by ~4.2%.

This is based on Mathieu Chartier's idea.

Bug: 12687968

Change-Id: I884dee7018f92761fad54269f4cd01db4fa82f2a

runtime/mirror/object-inl.h

diff --git a/runtime/mirror/object-inl.h b/runtime/mirror/object-inl.h
index eb391be..76a36ac 100644
--- a/runtime/mirror/object-inl.h
+++ b/runtime/mirror/object-inl.h
@@ -1068,7 +1068,7 @@
       MemberOffset field_offset = kIsStatic
           ? klass->GetFirstReferenceStaticFieldOffset<kVerifyFlags, kReadBarrierOption>(
               Runtime::Current()->GetClassLinker()->GetImagePointerSize())
-          : klass->GetFirstReferenceInstanceFieldOffset();
+          : klass->GetFirstReferenceInstanceFieldOffset<kVerifyFlags, kReadBarrierOption>();
       for (size_t i = 0u; i < num_reference_fields; ++i) {
         // TODO: Do a simpler check?
         if (field_offset.Uint32Value() != ClassOffset().Uint32Value()) {