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8180932: Parallelize safepoint cleanup

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Provide infrastructure to do safepoint cleanup tasks using parallel worker threads

Reviewed-by: dholmes, rehn, dcubed, thartmann
This commit is contained in:
Roman Kennke 2017-07-07 12:49:11 +02:00
parent d12604111c
commit 98bd53b5c2
12 changed files with 268 additions and 111 deletions
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12
hotspot/src/share/vm/runtime/synchronizer.hpp
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@ -32,6 +32,12 @@
class ObjectMonitor;
struct DeflateMonitorCounters {
int nInuse; // currently associated with objects
int nInCirculation; // extant
int nScavenged; // reclaimed
};
class ObjectSynchronizer : AllStatic {
friend class VMStructs;
public:
@ -127,7 +133,11 @@ 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();
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** listheadp,
ObjectMonitor** freeHeadp,