Join Scott as he goes over a new optimization of the CP VM's garbage collection. He'll also answer any questions folks have.

Visit the Adafruit shop online - http://www.adafruit.com

Thanks to dcd for timecodes

0:00 getting started

0:47 hello everyone

1:24 intro to the Adafruit Metro rp2350 microprocess

5:00 Future plans while Scott is out/part time

5:59 Fruit Jam OS - ( capture video recording ... )

8:47 with audio - recording that shows a couple of bugs ( 128 mS gaps triggered by garbage collection )

11:00 Audio buffer with DMA through PSRAM which was too slow ( moved to SRAM )

15:00 Bitmaps are not DMA'ed, but are still allocated outside the Python VM

17:00 Description of GC process

18:30 Mark-and-sweep in MicroPython and CircuitPython

20:28 Changing allocation to identify if there are allocations that don't containing pointers (for GC)

21:15 Bitmap.c -

22:36 gc.c gc_mark_+subtree

23:22 micropython split heap

25:49 Shared-bindings / displayio / Bitmap.C - mp_obj_malloc() vs. m_malloc()

30:49 misc.h allocations

32:43 dive into malloc.c and gc.c

44:00 continuing debugging with gdb

49:00 perhaps renaming the function will clarify things

53:22 gc_realloc()

56:17 if block is moved, need to copy the state

1:06:00 How do these improvements apply to micropython

1:09:10 Assertion failure in gc.c

1:13:51 Allocation/Debugging tools

1:28:42 handling re-alloc

1:31:55 consider TLSF tradeoffs

2:01:09 will be pushing the code to the leaf allocation branch

2:06:39 wrap up - should be here next week

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