id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	parents	p4branch	gitbranch	freebsdpr	duedate
32	Superpages are not used as often as desired	john	john	"At work we've found that there are some use cases where superpages are not used as often as we'd like.  Specifically, if we create several shared memory objects (via shm_open()) that are not exact multiples of a superpage and map them, they are assigned virtually contiguous addresses, meaning that they do not each start on a superpage boundary. This seems to be related to the fact that we only specify VMFS_ALIGNED_SPACE for device VM objects.

Secondly, if we pre-zero a file before mapping it, the file uses random pages from all over the place.  This may be harder to fix though alc@ may have a suggestion that might help."	defect	started	critical	kernel			vm