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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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13
hotspot/src/share/vm/prims/jvmtiEventController.cpp
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@ -1,5 +1,5 @@
/*
* Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 2003-2010 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
@ -82,7 +82,7 @@ static const jlong EARLY_EVENT_BITS = CLASS_FILE_LOAD_HOOK_BIT |
THREAD_START_BIT | THREAD_END_BIT |
DYNAMIC_CODE_GENERATED_BIT;
static const jlong GLOBAL_EVENT_BITS = ~THREAD_FILTERED_EVENT_BITS;
static const jlong SHOULD_POST_ON_EXCEPTIONS_BITS = EXCEPTION_BITS | METHOD_EXIT_BIT | FRAME_POP_BIT;
///////////////////////////////////////////////////////////////
//
@ -511,7 +511,12 @@ JvmtiEventControllerPrivate::recompute_thread_enabled(JvmtiThreadState *state) {
leave_interp_only_mode(state);
}
}
// update the JavaThread cached value for thread-specific should_post_on_exceptions value
bool should_post_on_exceptions = (any_env_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0;
state->set_should_post_on_exceptions(should_post_on_exceptions);
}
return any_env_enabled;
}
@ -615,6 +620,10 @@ JvmtiEventControllerPrivate::recompute_enabled() {
// set global truly enabled, that is, any thread in any environment
JvmtiEventController::_universal_global_event_enabled.set_bits(any_env_thread_enabled);
// set global should_post_on_exceptions
JvmtiExport::set_should_post_on_exceptions((any_env_thread_enabled & SHOULD_POST_ON_EXCEPTIONS_BITS) != 0);
}
EC_TRACE(("JVMTI [-] # recompute enabled - after %llx", any_env_thread_enabled));