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8147910: Cache initial active_processor_count

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Introduce and initialize active_processor_count variable in VM.

Reviewed-by: dholmes, jprovino
This commit is contained in:
Thomas Schatzl 2016-07-26 11:04:20 +02:00
parent da3339948e
commit 7c45404684
2 changed files with 24 additions and 3 deletions
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14
hotspot/src/share/vm/runtime/os.cpp
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@ -71,6 +71,7 @@ volatile int32_t* os::_mem_serialize_page = NULL;
uintptr_t os::_serialize_page_mask = 0;
long os::_rand_seed = 1;
int os::_processor_count = 0;
int os::_initial_active_processor_count = 0;
size_t os::_page_sizes[os::page_sizes_max];
#ifndef PRODUCT
@ -315,6 +316,7 @@ static void signal_thread_entry(JavaThread* thread, TRAPS) {
}
void os::init_before_ergo() {
initialize_initial_active_processor_count();
// We need to initialize large page support here because ergonomics takes some
// decisions depending on large page support and the calculated large page size.
large_page_init();
@ -829,7 +831,11 @@ void os::print_cpu_info(outputStream* st, char* buf, size_t buflen) {
st->print("CPU:");
st->print("total %d", os::processor_count());
// It's not safe to query number of active processors after crash
// st->print("(active %d)", os::active_processor_count());
// st->print("(active %d)", os::active_processor_count()); but we can
// print the initial number of active processors.
// We access the raw value here because the assert in the accessor will
// fail if the crash occurs before initialization of this value.
st->print(" (initial active %d)", _initial_active_processor_count);
st->print(" %s", VM_Version::features_string());
st->cr();
pd_print_cpu_info(st, buf, buflen);
@ -1597,6 +1603,12 @@ bool os::is_server_class_machine() {
return result;
}
void os::initialize_initial_active_processor_count() {
assert(_initial_active_processor_count == 0, "Initial active processor count already set.");
_initial_active_processor_count = active_processor_count();
log_debug(os)("Initial active processor count set to %d" , _initial_active_processor_count);
}
void os::SuspendedThreadTask::run() {
assert(Threads_lock->owned_by_self() || (_thread == VMThread::vm_thread()), "must have threads lock to call this");
internal_do_task();