MI changes:

 - provide an interface (macros) to the page coloring part of the VM system,
   this allows to try different coloring algorithms without the need to
   touch every file [1]
 - make the page queue tuning values readable: sysctl vm.stats.pagequeue
 - autotuning of the page coloring values based upon the cache size instead
   of options in the kernel config (disabling of the page coloring as a
   kernel option is still possible)

MD changes:
 - detection of the cache size: only IA32 and AMD64 (untested) contains
   cache size detection code, every other arch just comes with a dummy
   function (this results in the use of default values like it was the
   case without the autotuning of the page coloring)
 - print some more info on Intel CPU's (like we do on AMD and Transmeta
   CPU's)

Note to AMD owners (IA32 and AMD64): please run "sysctl vm.stats.pagequeue"
and report if the cache* values are zero (= bug in the cache detection code)
or not.

Based upon work by:	Chad David <davidc@acns.ab.ca> [1]
Reviewed by:		alc, arch (in 2004)
Discussed with:		alc, Chad David, arch (in 2004)

1 files changed, 3 insertions, 2 deletions

diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c
index 4b7151b..a2e0b3a 100644
--- a/sys/vm/vm_fault.c
+++ b/sys/vm/vm_fault.c
@@ -410,7 +410,8 @@ RetryFault:;
 
 			vm_pageq_remove_nowakeup(fs.m);
 
-			if ((queue - fs.m->pc) == PQ_CACHE && vm_page_count_severe()) {
+			if ((queue - fs.m->pc) == PQ_CACHE \
+			    && vm_page_count_severe()) {
 				vm_page_activate(fs.m);
 				vm_page_unlock_queues();
 				unlock_and_deallocate(&fs);
@@ -1006,7 +1007,7 @@ vm_fault_prefault(pmap_t pmap, vm_offset_t addra, vm_map_entry_t entry)
 		    (m->flags & (PG_BUSY | PG_FICTITIOUS)) == 0) {
 
 			vm_page_lock_queues();
-			if ((m->queue - m->pc) == PQ_CACHE)
+			if (VM_PAGE_INQUEUE1(m, PQ_CACHE))
 				vm_page_deactivate(m);
 			mpte = pmap_enter_quick(pmap, addr, m,
 			    entry->protection, mpte);