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8199406: Performance drop with Java JDK 1.8.0_162-b32

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Improve the nmethod unloading times by optimizing the search for an itable stub in VtableStubs array

Reviewed-by: kvn, coleenp, tschatzl
This commit is contained in:
Poonam Bajaj 2018-03-30 18:46:14 +00:00
parent 6bdeaad21a
commit 25fbd2ff16
7 changed files with 71 additions and 37 deletions
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13
src/hotspot/share/code/vtableStubs.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2018, 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
@ -60,7 +60,7 @@ void* VtableStub::operator new(size_t size, int code_size) throw() {
// There is a dependency on the name of the blob in src/share/vm/prims/jvmtiCodeBlobEvents.cpp
// If changing the name, update the other file accordingly.
BufferBlob* blob = BufferBlob::create("vtable chunks", bytes);
VtableBlob* blob = VtableBlob::create("vtable chunks", bytes);
if (blob == NULL) {
return NULL;
}
@ -167,17 +167,18 @@ void VtableStubs::enter(bool is_vtable_stub, int vtable_index, VtableStub* s) {
_number_of_vtable_stubs++;
}
bool VtableStubs::is_entry_point(address pc) {
VtableStub* VtableStubs::entry_point(address pc) {
MutexLocker ml(VtableStubs_lock);
VtableStub* stub = (VtableStub*)(pc - VtableStub::entry_offset());
uint hash = VtableStubs::hash(stub->is_vtable_stub(), stub->index());
VtableStub* s;
for (s = _table[hash]; s != NULL && s != stub; s = s->next()) {}
return s == stub;
if (s == stub) {
return s;
}
return NULL;
}
bool VtableStubs::contains(address pc) {
// simple solution for now - we may want to use
// a faster way if this function is called often