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8210986: Add OopStorage cleanup to ServiceThread

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Service thread performs cleanup when notified.

Reviewed-by: coleenp, rehn
This commit is contained in:
Kim Barrett 2018-11-05 18:27:14 -05:00
parent a1029a4729
commit 1e9d3b5358
6 changed files with 248 additions and 165 deletions
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29
src/hotspot/share/gc/shared/oopStorage.hpp
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@ -151,11 +151,19 @@ public:
// Other clients must use serial iteration.
template<bool concurrent, bool is_const> class ParState;
// Block cleanup functions are for the exclusive use of the GC.
// Both stop deleting if there is an in-progress concurrent iteration.
// Concurrent deletion locks both the _allocation_mutex and the _active_mutex.
void delete_empty_blocks_safepoint();
void delete_empty_blocks_concurrent();
// Service thread cleanup support.
// Stops deleting if there is an in-progress concurrent iteration.
// Locks both the _allocation_mutex and the _active_mutex, and may
// safepoint. Deletion may be throttled, with only some available
// work performed, in order to allow other Service thread subtasks
// to run. Returns true if there may be more work to do, false if
// nothing to do.
bool delete_empty_blocks();
// Service thread cleanup support.
// Called by the service thread (while holding Service_lock) to test
// whether a call to delete_empty_blocks should be made.
bool needs_delete_empty_blocks() const;
// Debugging and logging support.
const char* name() const;
@ -208,7 +216,9 @@ private:
const char* _name;
ActiveArray* _active_array;
AllocationList _allocation_list;
AIX_ONLY(public:) // xlC 12 on AIX doesn't implement C++ DR45.
Block* volatile _deferred_updates;
AIX_ONLY(private:)
Mutex* _allocation_mutex;
Mutex* _active_mutex;
@ -222,9 +232,18 @@ private:
// mutable because this gets set even for const iteration.
mutable int _concurrent_iteration_count;
volatile uint _needs_cleanup;
bool try_add_block();
Block* block_for_allocation();
Block* find_block_or_null(const oop* ptr) const;
void delete_empty_block(const Block& block);
bool reduce_deferred_updates();
void notify_needs_cleanup();
AIX_ONLY(public:) // xlC 12 on AIX doesn't implement C++ DR45.
void record_needs_cleanup();
AIX_ONLY(private:)
// Managing _active_array.
bool expand_active_array();