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When set, the split heap is automatically extended with new areas on demand, and shrunk if a heap area becomes empty during a GC pass or soft reset. To save code size the size allocation for a new heap block (including metadata) is estimated at 103% of the failed allocation, rather than working from the more complex algorithm in gc_try_add_heap(). This appears to work well except in the extreme limit case when almost all RAM is exhausted (~last few hundred bytes). However in this case some allocation is likely to fail soon anyhow. Currently there is no API to manually add a block of a given size to the heap, although that could easily be added if necessary. This work was funded through GitHub Sponsors. Signed-off-by:
Angus Gratton <angus@redyak.com.au>When set, the split heap is automatically extended with new areas on demand, and shrunk if a heap area becomes empty during a GC pass or soft reset. To save code size the size allocation for a new heap block (including metadata) is estimated at 103% of the failed allocation, rather than working from the more complex algorithm in gc_try_add_heap(). This appears to work well except in the extreme limit case when almost all RAM is exhausted (~last few hundred bytes). However in this case some allocation is likely to fail soon anyhow. Currently there is no API to manually add a block of a given size to the heap, although that could easily be added if necessary. This work was funded through GitHub Sponsors. Signed-off-by:Angus Gratton <angus@redyak.com.au>
