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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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12
src/hotspot/share/runtime/synchronizer.cpp
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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
@ -517,15 +517,15 @@ void ObjectSynchronizer::notifyall(Handle obj, TRAPS) {
// performed by the CPU(s) or platform.
struct SharedGlobals {
char _pad_prefix[DEFAULT_CACHE_LINE_SIZE];
char _pad_prefix[OM_CACHE_LINE_SIZE];
// These are highly shared mostly-read variables.
// To avoid false-sharing they need to be the sole occupants of a cache line.
volatile int stw_random;
volatile int stw_cycle;
DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int) * 2);
DEFINE_PAD_MINUS_SIZE(1, OM_CACHE_LINE_SIZE, sizeof(volatile int) * 2);
// Hot RW variable -- Sequester to avoid false-sharing
volatile int hc_sequence;
DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int));
DEFINE_PAD_MINUS_SIZE(2, OM_CACHE_LINE_SIZE, sizeof(volatile int));
};
static SharedGlobals GVars;
@ -1082,9 +1082,9 @@ ObjectMonitor* ObjectSynchronizer::om_alloc(Thread* self) {
assert(_BLOCKSIZE > 1, "invariant");
size_t neededsize = sizeof(PaddedObjectMonitor) * _BLOCKSIZE;
PaddedObjectMonitor* temp;
size_t aligned_size = neededsize + (DEFAULT_CACHE_LINE_SIZE - 1);
size_t aligned_size = neededsize + (OM_CACHE_LINE_SIZE - 1);
void* real_malloc_addr = NEW_C_HEAP_ARRAY(char, aligned_size, mtInternal);
temp = (PaddedObjectMonitor*)align_up(real_malloc_addr, DEFAULT_CACHE_LINE_SIZE);
temp = (PaddedObjectMonitor*)align_up(real_malloc_addr, OM_CACHE_LINE_SIZE);
(void)memset((void *) temp, 0, neededsize);
// Format the block.