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src/hotspot/share/runtime/synchronizer.hpp
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rev 56044 : imported patch 8230184.patch
rev 56046 : v2.00 -> v2.05 (CR5/v2.05/8-for-jdk13) patches combined into one; merge with 8229212.patch; merge with jdk-14+11; merge with 8230184.patch.
rev 56048 : Add OM_CACHE_LINE_SIZE so that ObjectMonitor cache line sizes can be experimented with independently of DEFAULT_CACHE_LINE_SIZE; for SPARC and X64 configs that use 128 for DEFAULT_CACHE_LINE_SIZE, we are experimenting with 64; move _previous_owner_tid and _allocation_state fields to share the cache line with ObjectMonitor::_header; put ObjectMonitor::_ref_count on its own cache line after _owner; add 'int* count_p' parameter to deflate_monitor_list() and deflate_monitor_list_using_JT() and push counter updates down to where the ObjectMonitors are actually removed from the in-use lists; monitors_iterate() async deflation check should use negative ref_count; add 'JavaThread* target' param to deflate_per_thread_idle_monitors_using_JT() add deflate_common_idle_monitors_using_JT() to make it clear which JavaThread* is the target of the work and which is the calling JavaThread* (self); g_free_list, g_om_in_use_list and g_om_in_use_count are now static to synchronizer.cpp (reduce scope); add more diagnostic info to some assert()'s; minor code cleanups and code motion; save_om_ptr() should detect a race with a deflating thread that is bailing out and cause a retry when the ref_count field is not positive; merge with jdk-14+11; add special GC support for TestHumongousClassLoader.java; merge with 8230184.patch.
rev 56049 : Merge the remainder of the lock-free monitor list changes from v2.06 with v2.06a and v2.06b after running the changes through the edit scripts; merge pieces from dcubed.monitor_deflate_conc.v2.06d in dcubed.monitor_deflate_conc.v2.06[ac]; merge pieces from dcubed.monitor_deflate_conc.v2.06e into dcubed.monitor_deflate_conc.v2.06c; merge with jdk-14+11; test work around for test/jdk/tools/jlink/multireleasejar/JLinkMultiReleaseJarTest.java should not been needed anymore.
@@ -33,17 +33,23 @@
class ObjectMonitor;
class ObjectMonitorHandle;
class ThreadsList;
-typedef PaddedEnd<ObjectMonitor, DEFAULT_CACHE_LINE_SIZE> PaddedObjectMonitor;
+#ifndef OM_CACHE_LINE_SIZE
+// Use DEFAULT_CACHE_LINE_SIZE if not already specified for
+// the current build platform.
+#define OM_CACHE_LINE_SIZE DEFAULT_CACHE_LINE_SIZE
+#endif
+
+typedef PaddedEnd<ObjectMonitor, OM_CACHE_LINE_SIZE> PaddedObjectMonitor;
struct DeflateMonitorCounters {
- int n_in_use; // currently associated with objects
- int n_in_circulation; // extant
- int n_scavenged; // reclaimed (global and per-thread)
- int per_thread_scavenged; // per-thread scavenge total
+ 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;
@@ -140,23 +146,25 @@
// 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_global_idle_monitors_using_JT();
- static void deflate_per_thread_idle_monitors_using_JT();
- static void deflate_common_idle_monitors_using_JT(bool is_global, JavaThread* self);
+ 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,
+ static int deflate_monitor_list(ObjectMonitor* volatile * list_p,
+ int volatile * 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,
+ static int deflate_monitor_list_using_JT(ObjectMonitor* volatile * list_p,
+ int volatile * count_p,
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,
@@ -189,37 +197,33 @@
outputStream * out,
int *error_cnt_p);
static void chk_per_thread_free_list_and_count(JavaThread *jt,
outputStream * out,
int *error_cnt_p);
- static void log_in_use_monitor_details(outputStream * out, bool on_exit);
+ static void log_in_use_monitor_details(outputStream * out);
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(DeflateMonitorCounters* counters);
private:
friend class SynchronizerTest;
enum { _BLOCKSIZE = 128 };
// global list of blocks of monitors
static PaddedObjectMonitor* volatile g_block_list;
- // global monitor free list
- static ObjectMonitor* volatile g_free_list;
- // global monitor in-use list, for moribund threads,
- // monitors they inflated need to be scanned for deflation
- static ObjectMonitor* volatile g_om_in_use_list;
- // count of entries in g_om_in_use_list
- static int g_om_in_use_count;
static volatile bool _is_async_deflation_requested;
static volatile bool _is_special_deflation_requested;
static jlong _last_async_deflation_time_ns;
+ // Function to prepend new blocks to the appropriate lists:
+ static void prepend_block_to_lists(PaddedObjectMonitor* new_blk);
+
// Process oops in all global used monitors (i.e. moribund thread's monitors)
static void global_used_oops_do(OopClosure* f);
// Process oops in monitors on the given list
- static void list_oops_do(ObjectMonitor* list, OopClosure* f);
+ static void list_oops_do(ObjectMonitor* list, int count, OopClosure* f);
// Support for SynchronizerTest access to GVars fields:
static u_char* get_gvars_addr();
static u_char* get_gvars_hc_sequence_addr();
static size_t get_gvars_size();
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