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8059846: InstanceKlass should use MutexLockerEx to acquire OsrList_lock

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Replace explicit locking of OsrList_lock by a MutexLockerEx instantiation.

Reviewed-by: kvn, anoll, drchase, dholmes, dlong, coleenp
This commit is contained in:
Tobias Hartmann 2014-10-16 12:57:04 +02:00
parent ed26c7e640
commit a87b3d13df
1 changed files with 13 additions and 19 deletions
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32
hotspot/src/share/vm/oops/instanceKlass.cpp
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@ -2779,19 +2779,18 @@ void InstanceKlass::adjust_default_methods(Method** old_methods, Method** new_me
// On-stack replacement stuff
void InstanceKlass::add_osr_nmethod(nmethod* n) {
// only one compilation can be active
NEEDS_CLEANUP
// This is a short non-blocking critical region, so the no safepoint check is ok.
OsrList_lock->lock_without_safepoint_check();
assert(n->is_osr_method(), "wrong kind of nmethod");
n->set_osr_link(osr_nmethods_head());
set_osr_nmethods_head(n);
// Raise the highest osr level if necessary
if (TieredCompilation) {
Method* m = n->method();
m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
{
// This is a short non-blocking critical region, so the no safepoint check is ok.
MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
assert(n->is_osr_method(), "wrong kind of nmethod");
n->set_osr_link(osr_nmethods_head());
set_osr_nmethods_head(n);
// Raise the highest osr level if necessary
if (TieredCompilation) {
Method* m = n->method();
m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
}
}
// Remember to unlock again
OsrList_lock->unlock();
// Get rid of the osr methods for the same bci that have lower levels.
if (TieredCompilation) {
@ -2807,7 +2806,7 @@ void InstanceKlass::add_osr_nmethod(nmethod* n) {
void InstanceKlass::remove_osr_nmethod(nmethod* n) {
// This is a short non-blocking critical region, so the no safepoint check is ok.
OsrList_lock->lock_without_safepoint_check();
MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
assert(n->is_osr_method(), "wrong kind of nmethod");
nmethod* last = NULL;
nmethod* cur = osr_nmethods_head();
@ -2844,13 +2843,11 @@ void InstanceKlass::remove_osr_nmethod(nmethod* n) {
}
m->set_highest_osr_comp_level(max_level);
}
// Remember to unlock again
OsrList_lock->unlock();
}
nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
// This is a short non-blocking critical region, so the no safepoint check is ok.
OsrList_lock->lock_without_safepoint_check();
MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
nmethod* osr = osr_nmethods_head();
nmethod* best = NULL;
while (osr != NULL) {
@ -2866,14 +2863,12 @@ nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_le
if (match_level) {
if (osr->comp_level() == comp_level) {
// Found a match - return it.
OsrList_lock->unlock();
return osr;
}
} else {
if (best == NULL || (osr->comp_level() > best->comp_level())) {
if (osr->comp_level() == CompLevel_highest_tier) {
// Found the best possible - return it.
OsrList_lock->unlock();
return osr;
}
best = osr;
@ -2882,7 +2877,6 @@ nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_le
}
osr = osr->osr_link();
}
OsrList_lock->unlock();
if (best != NULL && best->comp_level() >= comp_level && match_level == false) {
return best;
}