Mercurial > hg > truffle
changeset 4092:b5a5f30c483d
7110173: GCNotifier::pushNotification publishes stale data.
Summary: GCNotifier::pushNotification() references GCMemoryManager::_last_gc_stat but is called from GCMemoryManager::gc_end() before GCMemoryManager::_last_gc_stat is set up using the values in GCMemoryManager::_current_gc_stat. As a result the GC notification code accesses unitialized or stale data. Move the notification call after GCMemoryManager::_las_gc_stat is set, but inside the same if-block.
Reviewed-by: poonam, dholmes, fparain, mchung
| author | johnc |
|---|---|
| date | Mon, 21 Nov 2011 09:24:56 -0800 |
| parents | d06a2d7fcd5b |
| children | 6071e0581859 |
| files | src/share/vm/services/memoryManager.cpp |
| diffstat | 1 files changed, 8 insertions(+), 8 deletions(-) [+] |
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--- a/src/share/vm/services/memoryManager.cpp Mon Nov 21 07:47:34 2011 +0100 +++ b/src/share/vm/services/memoryManager.cpp Mon Nov 21 09:24:56 2011 -0800 @@ -168,10 +168,8 @@ // initialize the arrays for memory usage _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); - size_t len = num_pools * sizeof(MemoryUsage); - memset(_before_gc_usage_array, 0, len); - memset(_after_gc_usage_array, 0, len); _usage_array_size = num_pools; + clear(); } GCStatInfo::~GCStatInfo() { @@ -304,12 +302,8 @@ pool->set_last_collection_usage(usage); LowMemoryDetector::detect_after_gc_memory(pool); } - if(is_notification_enabled()) { - bool isMajorGC = this == MemoryService::get_major_gc_manager(); - GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC", - GCCause::to_string(cause)); - } } + if (countCollection) { _num_collections++; // alternately update two objects making one public when complete @@ -321,6 +315,12 @@ // reset the current stat for diagnosability purposes _current_gc_stat->clear(); } + + if (is_notification_enabled()) { + bool isMajorGC = this == MemoryService::get_major_gc_manager(); + GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC", + GCCause::to_string(cause)); + } } }