WITH_OBJECT_HEADERS enabled GC from Dalvik?

As I know Dalvik VM does not support generational GC as default.

But, I found "WITH_OBJECT_HEADERS" compilation flag which could be related with generational GC from HeapInternal.h file.

typedef struct DvmHeapChunk {
#if WITH_OBJECT_HEADERS
    u4 header;
    const Object *parent;
    const Object *parentOld;
    const Object *markFinger;
    const Object *markFingerOld;
    u2 birthGeneration;
    u2 markCount;
    u2 scanCount;
    u2 old开发者_Go百科MarkGeneration;
    u2 markGeneration;
    u2 oldScanGeneration;
    u2 scanGeneration;
#endif

Does anyone try to build Dalvik with this option enabled? Do you know anything about generational GC support from Dalvik?

This was part of an experiment. There is no generational GC support in the current release. Improvements to the GC will be part of a future release.