archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-17 17:44:40 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8246476: remove AsyncDeflateIdleMonitors option and the safepoint based deflation mechanism

Browse source 
Reviewed-by: dholmes, pchilanomate, coleenp
This commit is contained in:
Daniel D. Daugherty 2020-07-13 16:36:01 -04:00
parent 231a8408b2
commit 7436ef236e
14 changed files with 144 additions and 630 deletions
Download patch file Download diff file Expand all files Collapse all files

23
src/hotspot/share/runtime/synchronizer.hpp
View file

@ -42,14 +42,6 @@ class ThreadsList;
typedef PaddedEnd<ObjectMonitor, OM_CACHE_LINE_SIZE> PaddedObjectMonitor;
struct DeflateMonitorCounters {
volatile int n_in_use; // currently associated with objects
volatile int n_in_circulation; // extant
volatile int n_scavenged; // reclaimed (global and per-thread)
volatile int per_thread_scavenged; // per-thread scavenge total
double per_thread_times; // per-thread scavenge times
};
class ObjectSynchronizer : AllStatic {
friend class VMStructs;
public:
@ -131,20 +123,11 @@ class ObjectSynchronizer : AllStatic {
// GC: we current use aggressive monitor deflation policy
// Basically we deflate all monitors that are not busy.
// An adaptive profile-based deflation policy could be used if needed
static void deflate_idle_monitors(DeflateMonitorCounters* counters);
static void deflate_idle_monitors_using_JT();
static void deflate_global_idle_monitors_using_JT();
static void deflate_per_thread_idle_monitors_using_JT(JavaThread* target);
static void deflate_common_idle_monitors_using_JT(bool is_global, JavaThread* target);
static void deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters);
static void prepare_deflate_idle_monitors(DeflateMonitorCounters* counters);
static void finish_deflate_idle_monitors(DeflateMonitorCounters* counters);
// For a given monitor list: global or per-thread, deflate idle monitors
static int deflate_monitor_list(ObjectMonitor** list_p,
int* count_p,
ObjectMonitor** free_head_p,
ObjectMonitor** free_tail_p);
// For a given in-use monitor list: global or per-thread, deflate idle
// monitors using a JavaThread.
static int deflate_monitor_list_using_JT(ObjectMonitor** list_p,
@ -152,14 +135,10 @@ class ObjectSynchronizer : AllStatic {
ObjectMonitor** free_head_p,
ObjectMonitor** free_tail_p,
ObjectMonitor** saved_mid_in_use_p);
static bool deflate_monitor(ObjectMonitor* mid, oop obj,
ObjectMonitor** free_head_p,
ObjectMonitor** free_tail_p);
static bool deflate_monitor_using_JT(ObjectMonitor* mid,
ObjectMonitor** free_head_p,
ObjectMonitor** free_tail_p);
static bool is_async_deflation_needed();
static bool is_safepoint_deflation_needed();
static bool is_async_deflation_requested() { return _is_async_deflation_requested; }
static jlong last_async_deflation_time_ns() { return _last_async_deflation_time_ns; }
static bool request_deflate_idle_monitors(); // for whitebox test support and VM exit logging
@ -191,7 +170,7 @@ class ObjectSynchronizer : AllStatic {
static int log_monitor_list_counts(outputStream * out);
static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
static void do_safepoint_work(DeflateMonitorCounters* counters);
static void do_safepoint_work();
private:
friend class SynchronizerTest;