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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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37
src/hotspot/share/classfile/symbolTable.cpp
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@ -103,6 +103,7 @@ static THREAD_LOCAL bool _lookup_shared_first = false;
// Static arena for symbols that are not deallocated
Arena* SymbolTable::_arena = nullptr;
static bool _rehashed = false;
static uint64_t _alt_hash_seed = 0;
static inline void log_trace_symboltable_helper(Symbol* sym, const char* msg) {
@ -805,13 +806,39 @@ bool SymbolTable::do_rehash() {
return true;
}
bool SymbolTable::should_grow() {
return get_load_factor() > PREF_AVG_LIST_LEN && !_local_table->is_max_size_reached();
}
bool SymbolTable::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 SymbolTable::rehash_table() {
static bool rehashed = false;
log_debug(symboltable)("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(symboltable)("Choosing growing over rehashing.");
trigger_cleanup();
_needs_rehashing = false;
@ -819,7 +846,7 @@ void SymbolTable::rehash_table() {
}
// Already rehashed.
if (rehashed) {
if (_rehashed) {
log_warning(symboltable)("Rehashing already done, still long lists.");
trigger_cleanup();
_needs_rehashing = false;
@ -829,7 +856,7 @@ void SymbolTable::rehash_table() {
_alt_hash_seed = AltHashing::compute_seed();
if (do_rehash()) {
rehashed = true;
_rehashed = true;
} else {
log_info(symboltable)("Resizes in progress rehashing skipped.");
}