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8038212: Method::is_valid_method() check has performance regression impact for stackwalking

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Only prune metaspace virtual spaces at safepoint so walking them is safe outside a safepoint.

Reviewed-by: mgerdin, mgronlun, hseigel, stefank
This commit is contained in:
Coleen Phillimore 2014-05-15 18:23:26 -04:00
parent cc3c656cf1
commit c336175c94
13 changed files with 84 additions and 72 deletions
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13
hotspot/src/share/vm/classfile/classLoaderData.hpp
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@ -66,6 +66,7 @@ class ClassLoaderDataGraph : public AllStatic {
static ClassLoaderData* _unloading;
// CMS support.
static ClassLoaderData* _saved_head;
static bool _should_purge;
static ClassLoaderData* add(Handle class_loader, bool anonymous, TRAPS);
static void post_class_unload_events(void);
@ -87,12 +88,20 @@ class ClassLoaderDataGraph : public AllStatic {
static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); }
static GrowableArray<ClassLoaderData*>* new_clds();
static void set_should_purge(bool b) { _should_purge = b; }
static void purge_if_needed() {
// Only purge the CLDG for CMS if concurrent sweep is complete.
if (_should_purge) {
purge();
// reset for next time.
set_should_purge(false);
}
}
static void dump_on(outputStream * const out) PRODUCT_RETURN;
static void dump() { dump_on(tty); }
static void verify();
// expensive test for pointer in metaspace for debugging
static bool contains(const void* x);
#ifndef PRODUCT
static bool contains_loader_data(ClassLoaderData* loader_data);
#endif