In dalvik\vm\alloc\marksweep.c's function:
dvmHeapSweepUnmarkedObjects(int *numFreed, size_t *sizeFreed)
{
...
* dvmHeapBitmapXorWalkLists(markBitmaps, objectBitmaps,
numBitmaps,sweepBitmapCallback, NULL);*
...
}
2009/12/11 fadden <[email protected]>
> What bit of code are you looking at?
>
> On Dec 10, 12:35 am, bazookier <[email protected]> wrote:
> > The gc in dalvik is not very difficult.
> > I can understand most things and how they work.
> > But one thing I don't understand.
> > When freeing the memory allocated by mspace which is set int the bits
> > of heap bitmap, it uses xor operating to calculate what should be
> > collected.
> > Suppose like this:
> > After last gc after this gc result should be
> > collected
> > 0 0 0 N
> > 1 1 0 N
> > 1 0 1 Y
> > 0 1 1 Y(Is
> > this right?)
> >
> > The first three cases are obviously correct.
> > But the last case perhaps is wrong.
> > Although it was not used before last gc, it is used since then.
> > It should not be collected as garbage I think.
> > Can anyone explain why?
>
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