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6672778: G1 should trim task queues more aggressively during evacuation pauses

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Regularly try to drain task queues. This helps memory usage and performance during garbage collection.

Reviewed-by: sjohanss, sangheki
This commit is contained in:
Thomas Schatzl 2018-04-27 12:06:46 +02:00
parent 893bd31647
commit 0f583c7817
24 changed files with 315 additions and 570 deletions
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9
src/hotspot/share/gc/shared/taskqueue.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -285,9 +285,10 @@ public:
inline bool push(E t);
// Attempts to claim a task from the "local" end of the queue (the most
// recently pushed). If successful, returns true and sets t to the task;
// otherwise, returns false (the queue is empty).
inline bool pop_local(volatile E& t);
// recently pushed) as long as the number of entries exceeds the threshold.
// If successful, returns true and sets t to the task; otherwise, returns false
// (the queue is empty or the number of elements below the threshold).
inline bool pop_local(volatile E& t, uint threshold = 0);
// Like pop_local(), but uses the "global" end of the queue (the least
// recently pushed).