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6984287: Regularize how GC parallel workers are specified

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Associate number of GC workers with the workgang as opposed to the task.

Reviewed-by: johnc, ysr
This commit is contained in:
Jon Masamitsu 2010-09-20 14:38:38 -07:00
parent 3af63c10ab
commit 28e56b8970
29 changed files with 504 additions and 216 deletions
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12
hotspot/src/share/vm/memory/sharedHeap.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 2010, 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
@ -50,7 +50,8 @@ SharedHeap::SharedHeap(CollectorPolicy* policy_) :
_perm_gen(NULL), _rem_set(NULL),
_strong_roots_parity(0),
_process_strong_tasks(new SubTasksDone(SH_PS_NumElements)),
_workers(NULL), _n_par_threads(0)
_n_par_threads(0),
_workers(NULL)
{
if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) {
vm_exit_during_initialization("Failed necessary allocation.");
@ -60,11 +61,13 @@ SharedHeap::SharedHeap(CollectorPolicy* policy_) :
(UseConcMarkSweepGC && CMSParallelRemarkEnabled) ||
UseG1GC) &&
ParallelGCThreads > 0) {
_workers = new WorkGang("Parallel GC Threads", ParallelGCThreads,
_workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads,
/* are_GC_task_threads */true,
/* are_ConcurrentGC_threads */false);
if (_workers == NULL) {
vm_exit_during_initialization("Failed necessary allocation.");
} else {
_workers->initialize_workers();
}
}
}
@ -77,8 +80,9 @@ bool SharedHeap::heap_lock_held_for_gc() {
}
void SharedHeap::set_par_threads(int t) {
assert(t == 0 || !UseSerialGC, "Cannot have parallel threads");
_n_par_threads = t;
_process_strong_tasks->set_par_threads(t);
_process_strong_tasks->set_n_threads(t);
}
class AssertIsPermClosure: public OopClosure {