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src/hotspot/share/runtime/synchronizer.hpp
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rev 57232 : v2.00 -> v2.08 (CR8/v2.08/11-for-jdk14) patches combined into one; merge with jdk-14+25 snapshot; merge with jdk-14+26 snapshot.
rev 57233 : See CR8-to-CR9-changes; merge with 8230876.patch (2019.11.15); merge with jdk-14+25 snapshot; fuzzy merge with jdk-14+26 snapshot.
*** 30,48 ****
#include "runtime/basicLock.hpp"
#include "runtime/handles.hpp"
#include "runtime/perfData.hpp"
class ObjectMonitor;
class ThreadsList;
! typedef PaddedEnd<ObjectMonitor, DEFAULT_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
double per_thread_times; // per-thread scavenge times
};
class ObjectSynchronizer : AllStatic {
friend class VMStructs;
--- 30,55 ----
#include "runtime/basicLock.hpp"
#include "runtime/handles.hpp"
#include "runtime/perfData.hpp"
class ObjectMonitor;
+ class ObjectMonitorHandle;
class ThreadsList;
! #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 {
! 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;
*** 94,112 ****
// with original recursion count
static intx complete_exit(Handle obj, TRAPS);
static void reenter (Handle obj, intx recursions, TRAPS);
// thread-specific and global ObjectMonitor free list accessors
! static ObjectMonitor* om_alloc(Thread* self);
static void om_release(Thread* self, ObjectMonitor* m,
bool FromPerThreadAlloc);
static void om_flush(Thread* self);
// Inflate light weight monitor to heavy weight monitor
! static ObjectMonitor* inflate(Thread* self, oop obj, const InflateCause cause);
// This version is only for internal use
! static void inflate_helper(oop obj);
static const char* inflate_cause_name(const InflateCause cause);
// Returns the identity hash value for an oop
// NOTE: It may cause monitor inflation
static intptr_t identity_hash_value_for(Handle obj);
--- 101,120 ----
// with original recursion count
static intx complete_exit(Handle obj, TRAPS);
static void reenter (Handle obj, intx recursions, TRAPS);
// thread-specific and global ObjectMonitor free list accessors
! static ObjectMonitor* om_alloc(Thread* self, const InflateCause cause);
static void om_release(Thread* self, ObjectMonitor* m,
bool FromPerThreadAlloc);
static void om_flush(Thread* self);
// Inflate light weight monitor to heavy weight monitor
! static void inflate(ObjectMonitorHandle* omh_p, Thread* self, oop obj,
! const InflateCause cause);
// This version is only for internal use
! static void inflate_helper(ObjectMonitorHandle* omh_p, oop obj);
static const char* inflate_cause_name(const InflateCause cause);
// Returns the identity hash value for an oop
// NOTE: It may cause monitor inflation
static intptr_t identity_hash_value_for(Handle obj);
*** 124,188 ****
// 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_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,
ObjectMonitor** free_head_p,
ObjectMonitor** free_tail_p);
static bool deflate_monitor(ObjectMonitor* mid, oop obj,
ObjectMonitor** free_head_p,
ObjectMonitor** free_tail_p);
! static bool is_cleanup_needed();
static bool needs_monitor_scavenge();
static void oops_do(OopClosure* f);
// Process oops in thread local used monitors
static void thread_local_used_oops_do(Thread* thread, OopClosure* f);
// debugging
static void audit_and_print_stats(bool on_exit);
static void chk_free_entry(JavaThread* jt, ObjectMonitor* n,
outputStream * out, int *error_cnt_p);
static void chk_global_free_list_and_count(outputStream * out,
int *error_cnt_p);
static void chk_global_in_use_list_and_count(outputStream * out,
int *error_cnt_p);
static void chk_in_use_entry(JavaThread* jt, ObjectMonitor* n,
outputStream * out, int *error_cnt_p);
static void chk_per_thread_in_use_list_and_count(JavaThread *jt,
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 int log_monitor_list_counts(outputStream * out);
static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
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;
// 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);
// 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();
--- 132,220 ----
// 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,
+ int* 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,
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 needs_monitor_scavenge();
+ static bool is_safepoint_deflation_needed();
+ static bool is_async_deflation_requested() { return _is_async_deflation_requested; }
+ static bool is_special_deflation_requested() { return _is_special_deflation_requested; }
+ static void set_is_async_deflation_requested(bool new_value) { _is_async_deflation_requested = new_value; }
+ static void set_is_special_deflation_requested(bool new_value) { _is_special_deflation_requested = new_value; }
+ static jlong time_since_last_async_deflation_ms();
static void oops_do(OopClosure* f);
// Process oops in thread local used monitors
static void thread_local_used_oops_do(Thread* thread, OopClosure* f);
// debugging
static void audit_and_print_stats(bool on_exit);
static void chk_free_entry(JavaThread* jt, ObjectMonitor* n,
outputStream * out, int *error_cnt_p);
static void chk_global_free_list_and_count(outputStream * out,
int *error_cnt_p);
+ static void chk_global_wait_list_and_count(outputStream * out,
+ int *error_cnt_p);
static void chk_global_in_use_list_and_count(outputStream * out,
int *error_cnt_p);
static void chk_in_use_entry(JavaThread* jt, ObjectMonitor* n,
outputStream * out, int *error_cnt_p);
static void chk_per_thread_in_use_list_and_count(JavaThread *jt,
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);
static int log_monitor_list_counts(outputStream * out);
static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
+ static void do_safepoint_work(DeflateMonitorCounters* counters);
+
private:
friend class SynchronizerTest;
enum { _BLOCKSIZE = 128 };
// global list of blocks of monitors
! static PaddedObjectMonitor* g_block_list;
! 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, 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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