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7011379: G1: overly long concurrent marking cycles

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This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.

Reviewed-by: johnc, ysr
This commit is contained in:
Antonios Printezis 2011-01-19 09:35:17 -05:00
parent a484211e0b
commit 05b7df20dd
8 changed files with 130 additions and 18 deletions
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8
hotspot/src/share/vm/gc_implementation/g1/concurrentMark.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2011, 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
@ -1171,12 +1171,12 @@ void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) {
if (G1TraceMarkStackOverflow)
gclog_or_tty->print_cr("\nRemark led to restart for overflow.");
} else {
SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set();
// We're done with marking.
// This is the end of the marking cycle, we're expected all
// threads to have SATB queues with active set to true.
JavaThread::satb_mark_queue_set().set_active_all_threads(
false, /* new active value */
true /* expected_active */);
satb_mq_set.set_active_all_threads(false, /* new active value */
true /* expected_active */);
if (VerifyDuringGC) {
HandleMark hm; // handle scope