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py/gc: Add "max new split" value in result of gc.mem_free().

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Follow-up to 519c24dd48 when MICROPY_GC_SPLIT_HEAP_AUTO is enabled, based
on discussion at
https://github.com/orgs/micropython/discussions/12316#discussioncomment-6858007

gc.mem_free() is always a heuristic, but this makes it a more useful
heuristic for common use cases.

Signed-off-by: Angus Gratton <angus@redyak.com.au>
This commit is contained in:
Angus Gratton 2023-09-05 10:58:19 +10:00 committed by Damien George
parent 174bb28d8e
commit 3e8aed9fcc
3 changed files with 14 additions and 1 deletions
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7
py/gc.c
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@ -701,6 +701,11 @@ void gc_info(gc_info_t *info) {
info->used *= BYTES_PER_BLOCK;
info->free *= BYTES_PER_BLOCK;
#if MICROPY_GC_SPLIT_HEAP_AUTO
info->max_new_split = gc_get_max_new_split();
#endif
GC_EXIT();
}
@ -1159,7 +1164,7 @@ void gc_dump_info(const mp_print_t *print) {
mp_printf(print, "GC: total: %u, used: %u, free: %u",
(uint)info.total, (uint)info.used, (uint)info.free);
#if MICROPY_GC_SPLIT_HEAP_AUTO
mp_printf(print, ", max new split: %u", (uint)gc_get_max_new_split());
mp_printf(print, ", max new split: %u", (uint)info.max_new_split);
#endif
mp_printf(print, "\n No. of 1-blocks: %u, 2-blocks: %u, max blk sz: %u, max free sz: %u\n",
(uint)info.num_1block, (uint)info.num_2block, (uint)info.max_block, (uint)info.max_free);

3
py/gc.h
View File

@ -75,6 +75,9 @@ typedef struct _gc_info_t {
size_t num_1block;
size_t num_2block;
size_t max_block;
#if MICROPY_GC_SPLIT_HEAP_AUTO
size_t max_new_split;
#endif
} gc_info_t;
void gc_info(gc_info_t *info);

5
py/modgc.c
View File

@ -64,7 +64,12 @@ MP_DEFINE_CONST_FUN_OBJ_0(gc_isenabled_obj, gc_isenabled);
STATIC mp_obj_t gc_mem_free(void) {
gc_info_t info;
gc_info(&info);
#if MICROPY_GC_SPLIT_HEAP_AUTO
// Include max_new_split value here as a more useful heuristic
return MP_OBJ_NEW_SMALL_INT(info.free + info.max_new_split);
#else
return MP_OBJ_NEW_SMALL_INT(info.free);
#endif
}
MP_DEFINE_CONST_FUN_OBJ_0(gc_mem_free_obj, gc_mem_free);