freebsd-nq/sys/vm
Alan Cox 11752d88a2 Add a new physical memory allocator. However, do not yet connect it
to the build.

This allocator uses a binary buddy system with a twist.  First and
foremost, this allocator is required to support the implementation of
superpages.  As a side effect, it enables a more robust implementation
of contigmalloc(9).  Moreover, this reimplementation of
contigmalloc(9) eliminates the acquisition of Giant by
contigmalloc(..., M_NOWAIT, ...).

The twist is that this allocator tries to reduce the number of TLB
misses incurred by accesses through a direct map to small, UMA-managed
objects and page table pages.  Roughly speaking, the physical pages
that are allocated for such purposes are clustered together in the
physical address space.  The performance benefits vary.  In the most
extreme case, a uniprocessor kernel running on an Opteron, I measured
an 18% reduction in system time during a buildworld.

This allocator does not implement page coloring.  The reason is that
superpages have much the same effect.  The contiguous physical memory
allocation necessary for a superpage is inherently colored.

Finally, the one caveat is that this allocator does not effectively
support prezeroed pages.  I hope this is temporary.  On i386, this is
a slight pessimization.  However, on amd64, the beneficial effects of
the direct-map optimization outweigh the ill effects.  I speculate
that this is true in general of machines with a direct map.

Approved by:	re
2007-06-10 00:49:16 +00:00
..
default_pager.c
device_pager.c Replace PG_BUSY with VPO_BUSY. In other words, changes to the page's 2006-10-22 04:28:14 +00:00
memguard.c
memguard.h
phys_pager.c Minor typo fix, noticed while I was going through *_pager.c files. 2007-04-10 12:34:51 +00:00
pmap.h Complete the transition from pmap_page_protect() to pmap_remove_write(). 2006-08-01 19:06:06 +00:00
redzone.c
redzone.h
swap_pager.c Do proper "locking" for missing vmmeters part. 2007-06-04 21:45:18 +00:00
swap_pager.h - Move 'struct swdevt' back into swap_pager.h and expose it to userland. 2007-02-07 17:43:11 +00:00
uma_core.c Revert VMCNT_* operations introduction. 2007-05-31 22:52:15 +00:00
uma_dbg.c
uma_dbg.h
uma_int.h Update stale comment on protecting UMA per-CPU caches: we now use 2007-05-09 22:53:34 +00:00
uma.h Add uma_set_align() interface, which will be called at most once during 2007-02-11 20:13:52 +00:00
vm_contig.c Revert VMCNT_* operations introduction. 2007-05-31 22:52:15 +00:00
vm_extern.h
vm_fault.c Rework the PCPU_* (MD) interface: 2007-06-04 21:38:48 +00:00
vm_glue.c Commit 14/14 of sched_lock decomposition. 2007-06-05 00:00:57 +00:00
vm_init.c
vm_kern.c When KVA is exhausted, try the vm_lowmem event for the last time before 2007-04-05 20:52:51 +00:00
vm_kern.h The clean_map has been made local to vm_init.c long ago. 2006-11-20 16:23:34 +00:00
vm_map.c Revert VMCNT_* operations introduction. 2007-05-31 22:52:15 +00:00
vm_map.h
vm_meter.c Commit 14/14 of sched_lock decomposition. 2007-06-05 00:00:57 +00:00
vm_mmap.c Revert VMCNT_* operations introduction. 2007-05-31 22:52:15 +00:00
vm_object.c Do proper "locking" for missing vmmeters part. 2007-06-04 21:45:18 +00:00
vm_object.h Eliminate OBJ_WRITEABLE. It hasn't been used in a long time. 2006-07-21 06:40:29 +00:00
vm_page.c Do proper "locking" for missing vmmeters part. 2007-06-04 21:45:18 +00:00
vm_page.h Define every architecture as either VM_PHYSSEG_DENSE or 2007-05-05 19:50:28 +00:00
vm_pageout.c Commit 14/14 of sched_lock decomposition. 2007-06-05 00:00:57 +00:00
vm_pageout.h
vm_pageq.c Revert VMCNT_* operations introduction. 2007-05-31 22:52:15 +00:00
vm_pager.c
vm_pager.h
vm_param.h Correct two comments. 2007-04-19 04:52:47 +00:00
vm_phys.c Add a new physical memory allocator. However, do not yet connect it 2007-06-10 00:49:16 +00:00
vm_phys.h Add a new physical memory allocator. However, do not yet connect it 2007-06-10 00:49:16 +00:00
vm_unix.c
vm_zeroidle.c Commit 14/14 of sched_lock decomposition. 2007-06-05 00:00:57 +00:00
vm.h Retire debug.mpsafevm. None of the architectures supported in CVS require 2006-07-21 23:22:49 +00:00
vnode_pager.c Do proper "locking" for missing vmmeters part. 2007-06-04 21:45:18 +00:00
vnode_pager.h