Question on block_size_min

[paulhamsh]

Firstly, this is very cool - thank you for sharing it!!

In tlsf.c, the definition of block_size_min seems too small.
My reasoning is that a free block must have the size, next_free and prev_free pointers at the start, plus hold the prev_phys_block pointer at the end (from the next block in memory).
So it seems it should be sizeof(block_header_t) exactly?

I think it probably works because when asking for even 1 byte it is rounded up to 4 bytes, and hence provides a structure of 16 bytes.

/*
** A free block must be large enough to store its header minus the size of
** the prev_phys_block field, and no larger than the number of addressable
** bits for FL_INDEX.
*/
#define block_size_min  (sizeof(block_header_t) - sizeof(block_header_t*))