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8073165: Contended Locking fast exit bucket

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JEP-143/JDK-8073165 Contended Locking fast exit bucket

Co-authored-by: Dave Dice <dave.dice@oracle.com>
Co-authored-by: Karen Kinnear <karen.kinnear@oracle.com>
Reviewed-by: dholmes, acorn, dice, dcubed
This commit is contained in:
Daniel D. Daugherty 2015-04-16 08:23:26 -07:00
parent d30de5ab31
commit 884f0d320f
14 changed files with 326 additions and 215 deletions
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14
hotspot/src/share/vm/runtime/synchronizer.hpp
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@ -116,9 +116,10 @@ class ObjectSynchronizer : AllStatic {
// 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();
static int walk_monitor_list(ObjectMonitor** listheadp,
ObjectMonitor** freeHeadp,
ObjectMonitor** freeTailp);
// For a given monitor list: global or per-thread, deflate idle monitors
static int deflate_monitor_list(ObjectMonitor** listheadp,
ObjectMonitor** freeHeadp,
ObjectMonitor** freeTailp);
static bool deflate_monitor(ObjectMonitor* mid, oop obj,
ObjectMonitor** freeHeadp,
ObjectMonitor** freeTailp);
@ -135,16 +136,17 @@ class ObjectSynchronizer : AllStatic {
private:
enum { _BLOCKSIZE = 128 };
// global list of blocks of monitors
// gBlockList is really PaddedEnd<ObjectMonitor> *, but we don't
// want to expose the PaddedEnd template more than necessary.
static ObjectMonitor* gBlockList;
static ObjectMonitor * gBlockList;
// global monitor free list
static ObjectMonitor * volatile gFreeList;
// global monitor in use list, for moribund threads,
// global monitor in-use list, for moribund threads,
// monitors they inflated need to be scanned for deflation
static ObjectMonitor * volatile gOmInUseList;
// count of entries in gOmInUseList
static int gOmInUseCount;
};
// ObjectLocker enforced balanced locking and can never thrown an