archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-08-27 06:45:07 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8186042: Optimize OopMapCache lookup

Browse source 
Use lock free access to oopMapCache

Co-authored-by: Frederic Parain <frederic.parain@oracle.com>
Reviewed-by: dholmes, sspitsyn
This commit is contained in:
Coleen Phillimore 2017-08-28 09:06:30 -04:00
parent 437d3f2c3b
commit 96aa3d9dbe
8 changed files with 135 additions and 120 deletions
Download patch file Download diff file Expand all files Collapse all files

26
hotspot/src/share/vm/oops/method.cpp
View file

@ -214,26 +214,14 @@ int Method::fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_kla
}
void Method::mask_for(int bci, InterpreterOopMap* mask) {
Thread* myThread = Thread::current();
methodHandle h_this(myThread, this);
#if defined(ASSERT) && !INCLUDE_JVMCI
bool has_capability = myThread->is_VM_thread() ||
myThread->is_ConcurrentGC_thread() ||
myThread->is_GC_task_thread();
if (!has_capability) {
if (!VerifyStack && !VerifyLastFrame) {
// verify stack calls this outside VM thread
warning("oopmap should only be accessed by the "
"VM, GC task or CMS threads (or during debugging)");
InterpreterOopMap local_mask;
method_holder()->mask_for(h_this, bci, &local_mask);
local_mask.print();
}
methodHandle h_this(Thread::current(), this);
// Only GC uses the OopMapCache during thread stack root scanning
// any other uses generate an oopmap but do not save it in the cache.
if (Universe::heap()->is_gc_active()) {
method_holder()->mask_for(h_this, bci, mask);
} else {
OopMapCache::compute_one_oop_map(h_this, bci, mask);
}
#endif
method_holder()->mask_for(h_this, bci, mask);
return;
}