Garbage collector in android 2.3

From Google groups, I found out that Android 2.3 uses a simultaneous garbage collector. From the source code, I see that it uses both the copy collector and the mark and scan; my question is whether concurrency was implemented in the GC method and scan or when copying GC.please will help me soon

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By default, concurrency means only a matching token and garbage collector. Thus, in android 2.3, parallel label and sweep are used for stack-related objects that handle everything, since the pointer and copying the garbage collection are used for objects on the heap.

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Source: https://habr.com/ru/post/1789161/