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7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11

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Add CriticalPriority == MaxPriority+1 and enable scheduling class as well as thread priority to change on Solaris.

Reviewed-by: dholmes, dcubed
This commit is contained in:
Paul Hohensee 2012-01-26 20:06:06 -05:00
parent 7ece654913
commit 09e21afaaa
9 changed files with 289 additions and 140 deletions
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25
hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2012, 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
@ -75,10 +75,25 @@ ConcurrentMarkSweepThread::ConcurrentMarkSweepThread(CMSCollector* collector)
set_name("Concurrent Mark-Sweep GC Thread");
if (os::create_thread(this, os::cgc_thread)) {
// XXX: need to set this to low priority
// unless "agressive mode" set; priority
// should be just less than that of VMThread.
os::set_priority(this, NearMaxPriority);
// An old comment here said: "Priority should be just less
// than that of VMThread". Since the VMThread runs at
// NearMaxPriority, the old comment was inaccurate, but
// changing the default priority to NearMaxPriority-1
// could change current behavior, so the default of
// NearMaxPriority stays in place.
//
// Note that there's a possibility of the VMThread
// starving if UseCriticalCMSThreadPriority is on.
// That won't happen on Solaris for various reasons,
// but may well happen on non-Solaris platforms.
int native_prio;
if (UseCriticalCMSThreadPriority) {
native_prio = os::java_to_os_priority[CriticalPriority];
} else {
native_prio = os::java_to_os_priority[NearMaxPriority];
}
os::set_native_priority(this, native_prio);
if (!DisableStartThread) {
os::start_thread(this);
}