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8006952: Slow VM due to excessive code cache freelist iteration

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Remove continous free block requirement

Reviewed-by: kvn
This commit is contained in:
Nils Eliasson 2013-04-11 13:57:44 +02:00
parent 33e3f6b59b
commit 92ef5fe748
8 changed files with 123 additions and 154 deletions
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32
hotspot/src/share/vm/code/codeCache.cpp
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@ -172,7 +172,7 @@ nmethod* CodeCache::next_nmethod (CodeBlob* cb) {
static size_t maxCodeCacheUsed = 0;
CodeBlob* CodeCache::allocate(int size) {
CodeBlob* CodeCache::allocate(int size, bool is_critical) {
// Do not seize the CodeCache lock here--if the caller has not
// already done so, we are going to lose bigtime, since the code
// cache will contain a garbage CodeBlob until the caller can
@ -183,7 +183,7 @@ CodeBlob* CodeCache::allocate(int size) {
CodeBlob* cb = NULL;
_number_of_blobs++;
while (true) {
cb = (CodeBlob*)_heap->allocate(size);
cb = (CodeBlob*)_heap->allocate(size, is_critical);
if (cb != NULL) break;
if (!_heap->expand_by(CodeCacheExpansionSize)) {
// Expansion failed
@ -192,8 +192,8 @@ CodeBlob* CodeCache::allocate(int size) {
if (PrintCodeCacheExtension) {
ResourceMark rm;
tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)",
(intptr_t)_heap->begin(), (intptr_t)_heap->end(),
(address)_heap->end() - (address)_heap->begin());
(intptr_t)_heap->low_boundary(), (intptr_t)_heap->high(),
(address)_heap->high() - (address)_heap->low_boundary());
}
}
maxCodeCacheUsed = MAX2(maxCodeCacheUsed, ((address)_heap->high_boundary() -
@ -608,13 +608,13 @@ void CodeCache::verify_oops() {
address CodeCache::first_address() {
assert_locked_or_safepoint(CodeCache_lock);
return (address)_heap->begin();
return (address)_heap->low_boundary();
}
address CodeCache::last_address() {
assert_locked_or_safepoint(CodeCache_lock);
return (address)_heap->end();
return (address)_heap->high();
}
@ -996,10 +996,9 @@ void CodeCache::print() {
void CodeCache::print_summary(outputStream* st, bool detailed) {
size_t total = (_heap->high_boundary() - _heap->low_boundary());
st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT
"Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT
"Kb max_free_chunk=" SIZE_FORMAT "Kb",
"Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",
total/K, (total - unallocated_capacity())/K,
maxCodeCacheUsed/K, unallocated_capacity()/K, largest_free_block()/K);
maxCodeCacheUsed/K, unallocated_capacity()/K);
if (detailed) {
st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",
@ -1018,19 +1017,8 @@ void CodeCache::print_summary(outputStream* st, bool detailed) {
void CodeCache::log_state(outputStream* st) {
st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"
" adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'"
" largest_free_block='" SIZE_FORMAT "'",
" adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",
nof_blobs(), nof_nmethods(), nof_adapters(),
unallocated_capacity(), largest_free_block());
unallocated_capacity());
}
size_t CodeCache::largest_free_block() {
// This is called both with and without CodeCache_lock held so
// handle both cases.
if (CodeCache_lock->owned_by_self()) {
return _heap->largest_free_block();
} else {
MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
return _heap->largest_free_block();
}
}