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esp32: Enable automatic Python heap growth.
Via MICROPY_GC_SPLIT_HEAP_AUTO feature flag added in previous commit. Tested on ESP32 GENERIC_SPIRAM and GENERIC_S3 configurations, with some worst-case allocation patterns and the standard test suite. This work was funded through GitHub Sponsors. Signed-off-by: Angus Gratton <angus@redyak.com.au>
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‎docs/library/esp32.rst‎

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@@ -51,13 +51,20 @@ Functions
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buffers and other data. This data is useful to get a sense of how much memory
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is available to ESP-IDF and the networking stack in particular. It may shed
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some light on situations where ESP-IDF operations fail due to allocation failures.
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The information returned is *not* useful to troubleshoot Python allocation failures,
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use `micropython.mem_info()` instead.
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The capabilities parameter corresponds to ESP-IDF's ``MALLOC_CAP_XXX`` values but the
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two most useful ones are predefined as `esp32.HEAP_DATA` for data heap regions and
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`esp32.HEAP_EXEC` for executable regions as used by the native code emitter.
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Free IDF heap memory in the `esp32.HEAP_DATA` region is available to be
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automatically added to the MicroPython heap to prevent a MicroPython
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allocation from failing. However, the information returned here is otherwise
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*not* useful to troubleshoot Python allocation failures, use
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`micropython.mem_info()` instead. The "max new split" value in
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`micropython.mem_info()` output corresponds to the largest free block of
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ESP-IDF heap that could be automatically added on demand to the MicroPython
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heap.
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The return value is a list of 4-tuples, where each 4-tuple corresponds to one heap
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and contains: the total bytes, the free bytes, the largest free block, and
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the minimum free seen over time.

‎ports/esp32/gccollect.c‎

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@@ -80,3 +80,13 @@ void gc_collect(void) {
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}
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#endif
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#if MICROPY_GC_SPLIT_HEAP_AUTO
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// The largest new region that is available to become Python heap is the largest
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// free block in the ESP-IDF system heap.
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size_t gc_get_max_new_split(void) {
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return heap_caps_get_largest_free_block(MALLOC_CAP_DEFAULT);
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}
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#endif

‎ports/esp32/main.c‎

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@@ -75,6 +75,10 @@
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#define MP_TASK_STACK_LIMIT_MARGIN (1024)
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#endif
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// Initial Python heap size. This starts small but adds new heap areas on
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// demand due to settings MICROPY_GC_SPLIT_HEAP & MICROPY_GC_SPLIT_HEAP_AUTO
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#define MP_TASK_HEAP_SIZE (64 * 1024)
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int vprintf_null(const char *format, va_list ap) {
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// do nothing: this is used as a log target during raw repl mode
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return 0;
@@ -100,19 +104,13 @@ void mp_task(void *pvParameter) {
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ESP_LOGE("esp_init", "can't create event loop: 0x%x\n", err);
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}
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// Allocate the uPy heap using malloc and get the largest available region,
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// limiting to 1/2 total available memory to leave memory for the OS.
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// When SPIRAM is enabled, this will allocate from SPIRAM.
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uint32_t caps = MALLOC_CAP_8BIT;
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size_t heap_total = heap_caps_get_total_size(caps);
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size_t mp_task_heap_size = MIN(heap_caps_get_largest_free_block(caps), heap_total / 2);
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void *mp_task_heap = heap_caps_malloc(mp_task_heap_size, caps);
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void *mp_task_heap = MP_PLAT_ALLOC_HEAP(MP_TASK_HEAP_SIZE);
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soft_reset:
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// initialise the stack pointer for the main thread
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mp_stack_set_top((void *)sp);
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mp_stack_set_limit(MP_TASK_STACK_SIZE - MP_TASK_STACK_LIMIT_MARGIN);
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gc_init(mp_task_heap, mp_task_heap + mp_task_heap_size);
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gc_init(mp_task_heap, mp_task_heap + MP_TASK_HEAP_SIZE);
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mp_init();
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mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR__slash_lib));
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readline_init0();

‎ports/esp32/mpconfigport.h‎

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#define MICROPY_PY_THREAD_GIL (1)
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#define MICROPY_PY_THREAD_GIL_VM_DIVISOR (32)
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#define MICROPY_GC_SPLIT_HEAP (1)
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#define MICROPY_GC_SPLIT_HEAP_AUTO (1)
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// extended modules
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#ifndef MICROPY_ESPNOW
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#define MICROPY_ESPNOW (1)

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