Brian Feldman d951b75210 Fix a race in vm_page_sleep_if_busy(). Due to vm_object locking ... being incomplete, it currently has to know how to drop and pick back up the vm_object's mutex if it has to sleep and drop the page queue mutex. The problem with this is that if the page is busy, while we are sleeping, the page can be freed and object disappear. When trying to lock m->object, we'd get a stale or NULL pointer and crash. The object is now cached, but this makes the assumption that the object is referenced in some manner and will not itself disappear while it is unlocked. Since this only happens if the object is locked, I had to remove an assumption earlier in contigmalloc() that reversed the order of locking the object and doing vm_page_sleep_if_busy(), not the normal order.		2004-07-21 23:56:09 +00:00
..
default_pager.c
device_pager.c	Do the dreaded s/dev_t/struct cdev */	2004-06-16 09:47:26 +00:00
phys_pager.c
pmap.h
swap_pager.c	Properly brucify a string by outdenting it.	2004-07-06 02:27:30 +00:00
swap_pager.h
uma_core.c	Since breakage of malloc(9)/uma_zalloc(9) is totally non-optional in	2004-07-19 15:05:24 +00:00
uma_dbg.c
uma_dbg.h
uma_int.h
uma.h
vm_contig.c	Remove extraneous locks on the VM free page queue mutex; it is not	2004-07-19 23:29:36 +00:00
vm_extern.h
vm_fault.c
vm_glue.c	- Don't use a variable to point to the user area that we only use once.	2004-07-02 03:45:07 +00:00
vm_init.c
vm_kern.c
vm_kern.h
vm_map.c	Semi-gratuitous change. Move two refcount operations to their own lines	2004-07-21 05:08:10 +00:00
vm_map.h	Micro-optimize vmspace for 64-bit architectures: Colocate vm_refcnt and	2004-07-06 17:35:10 +00:00
vm_meter.c
vm_mmap.c
vm_object.c	Initialize result->backing_object_offset before linking result onto the list of	2004-06-28 20:26:35 +00:00
vm_object.h
vm_page.c	Fix a race in vm_page_sleep_if_busy(). Due to vm_object locking	2004-07-21 23:56:09 +00:00
vm_page.h	Reimplement contigmalloc(9) with an algorithm which stands a greatly-	2004-07-19 06:21:27 +00:00
vm_pageout.c	Remove the GIANT_REQUIRED preceding pmap_remove() in	2004-07-18 04:38:11 +00:00
vm_pageout.h
vm_pageq.c
vm_pager.c
vm_pager.h
vm_param.h	Second half of the dev_t cleanup.	2004-06-17 17:16:53 +00:00
vm_unix.c
vm_zeroidle.c	Implement preemption of kernel threads natively in the scheduler rather	2004-07-02 20:21:44 +00:00
vm.h
vnode_pager.c
vnode_pager.h