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8235931: add OM_CACHE_LINE_SIZE and use smaller size on SPARCv9 and X64

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Reviewed-by: dholmes, redestad, mdoerr
This commit is contained in:
Daniel D. Daugherty 2020-02-05 11:38:18 -05:00
parent e7e182a318
commit b9e3a4efef
5 changed files with 28 additions and 12 deletions
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10
src/hotspot/share/runtime/objectMonitor.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1998, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1998, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -120,6 +120,12 @@ class ObjectWaiter : public StackObj {
// intptr_t. There's no reason to use a 64-bit type for this field
// in a 64-bit JVM.
#ifndef OM_CACHE_LINE_SIZE
// Use DEFAULT_CACHE_LINE_SIZE if not already specified for
// the current build platform.
#define OM_CACHE_LINE_SIZE DEFAULT_CACHE_LINE_SIZE
#endif
class ObjectMonitor {
friend class ObjectSynchronizer;
friend class ObjectWaiter;
@ -139,7 +145,7 @@ class ObjectMonitor {
// _object is a good choice to share the cache line with _header.
// _next_om shares _header's cache line for pre-monitor list historical
// reasons. _next_om only changes if the next ObjectMonitor is deflated.
DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE,
DEFINE_PAD_MINUS_SIZE(0, OM_CACHE_LINE_SIZE,
sizeof(volatile markWord) + sizeof(void* volatile) +
sizeof(ObjectMonitor *));
void* volatile _owner; // pointer to owning thread OR BasicLock