三色源码解析

CMSCollector::checkpointRootsInitial

N

黑对象

CMSCollector::do_remark_non_parallel()

灰对象

CMSBitMap

空栈

标记

对象内成员引用

src/hotspot/share/memory/iterator.inline.hpp

VM_CMS_Initial_Mark::doit

CMSCollector::checkpointRootsFinalWork()

标记对象

标记任务开始

CMSCollector

_is_gc_active = true

CMSBitMap::isMarked

白对象

src/hotspot/share/gc/cms/cmsOopClosures.hpp

lass PushOrMarkClosure{ private:  CMSCollector*   _collector;  MemRegion       _span;//未标记  CMSBitMap*      _bitMap;//标记  CMSMarkStack*   _markStack;//用来成员变量标记  HeapWord* const _finger;  MarkFromRootsClosure* const                  _parent;

最终标记

出栈

当前对象标记

进栈

ParConcMarkingClosure::do_oop

开始变黑

CMSConcMarkingTask::work

非并行

do_scan_and_mark 灰色