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A few errors were introduced in the latest changes.
o Add VM_PAGE_WAIT calls around physical allocation attempts in case of
memory exhaustion.
o Fix stack release.
o Fix memory exhaustion report.
o Fix free page accounting.
* kern/slab.c (kmem_pagealloc, kmem_pagefree): New functions
(kmem_slab_create, kmem_slab_destroy, kalloc, kfree): Use kmem_pagealloc
and kmem_pagefree instead of the raw page allocation functions.
(kmem_cache_compute_sizes): Don't store slab order.
* kern/slab.h (struct kmem_cache): Remove `slab_order' member.
* kern/thread.c (stack_alloc): Call VM_PAGE_WAIT in case of memory
exhaustion.
(stack_collect): Call vm_page_free_contig instead of kmem_free to
release pages.
* vm/vm_page.c (vm_page_seg_alloc): Fix memory exhaustion report.
(vm_page_setup): Don't update vm_page_free_count.
(vm_page_free_pa): Check page parameter.
(vm_page_mem_free): New function.
* vm/vm_page.h (vm_page_free_count): Remove extern declaration.
(vm_page_mem_free): New prototype.
* vm/vm_pageout.c: Update comments not to refer to vm_page_free_count.
(vm_pageout_scan, vm_pageout_continue, vm_pageout): Use vm_page_mem_free
instead of vm_page_free_count, update types accordingly.
* vm/vm_resident.c (vm_page_free_count, vm_page_free_count_minimum):
Remove variables.
(vm_page_free_avail): New variable.
(vm_page_bootstrap, vm_page_grab, vm_page_release, vm_page_grab_contig,
vm_page_free_contig, vm_page_wait): Use vm_page_mem_free instead of vm_page_free_count,
update types accordingly, don't set vm_page_free_count_minimum.
* vm/vm_user.c (vm_statistics): Likewise.
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