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8306738: Select num workers for safepoint ParallelCleanupTask

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Reviewed-by: shade, coleenp, tschatzl
This commit is contained in:
Axel Boldt-Christmas 2023-05-09 14:04:26 +00:00
parent a05560d993
commit 672bade522
7 changed files with 116 additions and 12 deletions
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38
src/hotspot/share/classfile/stringTable.cpp
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@ -116,6 +116,8 @@ static size_t _current_size = 0;
static volatile size_t _items_count = 0;
volatile bool _alt_hash = false;
static bool _rehashed = false;
static uint64_t _alt_hash_seed = 0;
uintx hash_string(const jchar* s, int len, bool useAlt) {
@ -529,20 +531,46 @@ bool StringTable::do_rehash() {
return true;
}
bool StringTable::should_grow() {
return get_load_factor() > PREF_AVG_LIST_LEN && !_local_table->is_max_size_reached();
}
bool StringTable::rehash_table_expects_safepoint_rehashing() {
// No rehashing required
if (!needs_rehashing()) {
return false;
}
// Grow instead of rehash
if (should_grow()) {
return false;
}
// Already rehashed
if (_rehashed) {
return false;
}
// Resizing in progress
if (!_local_table->is_safepoint_safe()) {
return false;
}
return true;
}
void StringTable::rehash_table() {
static bool rehashed = false;
log_debug(stringtable)("Table imbalanced, rehashing called.");
// Grow instead of rehash.
if (get_load_factor() > PREF_AVG_LIST_LEN &&
!_local_table->is_max_size_reached()) {
if (should_grow()) {
log_debug(stringtable)("Choosing growing over rehashing.");
trigger_concurrent_work();
_needs_rehashing = false;
return;
}
// Already rehashed.
if (rehashed) {
if (_rehashed) {
log_warning(stringtable)("Rehashing already done, still long lists.");
trigger_concurrent_work();
_needs_rehashing = false;
@ -552,7 +580,7 @@ void StringTable::rehash_table() {
_alt_hash_seed = AltHashing::compute_seed();
{
if (do_rehash()) {
rehashed = true;
_rehashed = true;
} else {
log_info(stringtable)("Resizes in progress rehashing skipped.");
}