Function slab_ipers_hdr

freebsd/vm/uma_core.c:2017–2042

* Compute the number of items that will fit in a slab. If hdr is true, the * item count may be limited to provide space in the slab for an inline slab * header. Otherwise, all slab space will be provided for item storage. */

 * header.  Otherwise, all slab space will be provided for item storage.
 */
static u_int
slab_ipers_hdr(u_int size, u_int rsize, u_int slabsize, bool hdr)
{
	u_int ipers;
	u_int padpi;

	/* The padding between items is not needed after the last item. */
	padpi = rsize - size;

	if (hdr) {
		/*
		 * Start with the maximum item count and remove items until
		 * the slab header first alongside the allocatable memory.
		 */
		for (ipers = MIN(SLAB_MAX_SETSIZE,
		    (slabsize + padpi - slab_sizeof(1)) / rsize);
		    ipers > 0 &&
		    ipers * rsize - padpi + slab_sizeof(ipers) > slabsize;
		    ipers--)
			continue;
	} else {
		ipers = MIN((slabsize + padpi) / rsize, SLAB_MAX_SETSIZE);
	}

	return (ipers);
}

struct keg_layout_result {
	u_int format;