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6902182: 4/4 Starting with jdwp agent should not incur performance penalty

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Rename can_post_exceptions support to can_post_on_exceptions. Add support for should_post_on_exceptions flag to permit per JavaThread optimizations.

Reviewed-by: never, kvn, dcubed
This commit is contained in:
Tom Deneau 2010-02-01 17:35:05 -07:00 • committed by Daniel D. Daugherty
parent 679f958f72
commit f23b68b367
19 changed files with 111 additions and 52 deletions
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15
hotspot/src/share/vm/runtime/thread.hpp
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@ -1,5 +1,5 @@
/*
* Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 1997-2010 Sun Microsystems, Inc. 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
@ -1193,6 +1193,9 @@ class JavaThread: public Thread {
static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
static ByteSize should_post_on_exceptions_flag_offset() {
return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
}
#ifndef SERIALGC
static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
@ -1432,6 +1435,16 @@ public:
void increment_interp_only_mode() { ++_interp_only_mode; }
void decrement_interp_only_mode() { --_interp_only_mode; }
// support for cached flag that indicates whether exceptions need to be posted for this thread
// if this is false, we can avoid deoptimizing when events are thrown
// this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
private:
int _should_post_on_exceptions_flag;
public:
int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
private:
ThreadStatistics *_thread_stat;