Does non-gc heap belong to managed heap?

[shizihang20]

I am trying to figure out the underlying structure of the heap. I have noticed that the starting memory address of the non-gc heap is different from that of other gc heaps. Does this mean that the non-GC heap is not part of the managed heap?

[EgorBo]

It's an implementation detail. Most of the time - yes, it's just some random memory returned by VirtualAlloc/mmap outside of the gc_lower/gc_upper reserved bounds. Basically, any arbitrary memory can be registered as a non-gc heap (using a specialized API). There is an exception when a non-gc segment can be "within the gc heap range", AFAIR, it may happen only with the old "GC Segments" mode, never happens with GC Regions.

[shizihang20]

Thank you for your information, that's really helpful.