freebsd-dev/sys/vm
Attilio Rao 89f6b8632c Switch the vm_object mutex to be a rwlock. This will enable in the
future further optimizations where the vm_object lock will be held
in read mode most of the time the page cache resident pool of pages
are accessed for reading purposes.

The change is mostly mechanical but few notes are reported:
* The KPI changes as follow:
  - VM_OBJECT_LOCK() -> VM_OBJECT_WLOCK()
  - VM_OBJECT_TRYLOCK() -> VM_OBJECT_TRYWLOCK()
  - VM_OBJECT_UNLOCK() -> VM_OBJECT_WUNLOCK()
  - VM_OBJECT_LOCK_ASSERT(MA_OWNED) -> VM_OBJECT_ASSERT_WLOCKED()
    (in order to avoid visibility of implementation details)
  - The read-mode operations are added:
    VM_OBJECT_RLOCK(), VM_OBJECT_TRYRLOCK(), VM_OBJECT_RUNLOCK(),
    VM_OBJECT_ASSERT_RLOCKED(), VM_OBJECT_ASSERT_LOCKED()
* The vm/vm_pager.h namespace pollution avoidance (forcing requiring
  sys/mutex.h in consumers directly to cater its inlining functions
  using VM_OBJECT_LOCK()) imposes that all the vm/vm_pager.h
  consumers now must include also sys/rwlock.h.
* zfs requires a quite convoluted fix to include FreeBSD rwlocks into
  the compat layer because the name clash between FreeBSD and solaris
  versions must be avoided.
  At this purpose zfs redefines the vm_object locking functions
  directly, isolating the FreeBSD components in specific compat stubs.

The KPI results heavilly broken by this commit.  Thirdy part ports must
be updated accordingly (I can think off-hand of VirtualBox, for example).

Sponsored by:	EMC / Isilon storage division
Reviewed by:	jeff
Reviewed by:	pjd (ZFS specific review)
Discussed with:	alc
Tested by:	pho
2013-03-09 02:32:23 +00:00
..
default_pager.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
device_pager.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
memguard.c Fix a bug with memguard(9) on 32-bit architectures without a 2012-07-15 20:29:48 +00:00
memguard.h Fix a bug with memguard(9) on 32-bit architectures without a 2012-07-15 20:29:48 +00:00
phys_pager.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
pmap.h The page flag PGA_WRITEABLE is set and cleared exclusively by the pmap 2012-06-16 18:56:19 +00:00
redzone.c
redzone.h
sg_pager.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
swap_pager.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
swap_pager.h
uma_core.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
uma_dbg.c
uma_dbg.h
uma_int.h Merge from vmc-playground branch: 2013-02-26 23:35:27 +00:00
uma.h Merge from vmc-playground branch: 2013-02-26 23:35:27 +00:00
vm_extern.h
vm_fault.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_glue.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_init.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_kern.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_kern.h
vm_map.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_map.h - Get rid of unused function vmspace_wired_count(). 2013-01-14 12:12:56 +00:00
vm_meter.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_mmap.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_object.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_object.h Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_page.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_page.h Update a comment to reflect the elimination of the hold queue in r242300. 2012-11-17 04:00:19 +00:00
vm_pageout.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_pageout.h Move what remains of vm/vm_contig.c into vm/vm_pageout.c, where similar 2012-07-18 05:21:34 +00:00
vm_pager.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_pager.h Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_param.h
vm_phys.c Make VM_NDOMAIN a kernel option so that it can be enabled from a kernel 2013-02-14 19:38:04 +00:00
vm_phys.h Move the declaration of vm_phys_paddr_to_vm_page() from vm/vm_page.h 2012-11-16 05:55:56 +00:00
vm_reserv.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vm_reserv.h
vm_unix.c - Improve readability of sys_obreak(). 2013-01-11 09:58:35 +00:00
vm_zeroidle.c
vm.h - Fix locked memory accounting for maps with MAP_WIREFUTURE flag. 2012-12-18 07:35:01 +00:00
vnode_pager.c Switch the vm_object mutex to be a rwlock. This will enable in the 2013-03-09 02:32:23 +00:00
vnode_pager.h