Implement an optimization of the VM<->pmap API. Pass vm_page_t's directly

to various pmap_*() functions instead of looking up the physical address
and passing that.  In many cases, the first thing the pmap code was doing
was going to a lot of trouble to get back the original vm_page_t, or
it's shadow pv_table entry.

Inspired by: John Dyson's 1998 patches.

Also:
Eliminate pv_table as a seperate thing and build it into a machine
dependent part of vm_page_t.  This eliminates having a seperate set of
structions that shadow each other in a 1:1 fashion that we often went to
a lot of trouble to translate from one to the other. (see above)
This happens to save 4 bytes of physical memory for each page in the
system.  (8 bytes on the Alpha).

Eliminate the use of the phys_avail[] array to determine if a page is
managed (ie: it has pv_entries etc).  Store this information in a flag.
Things like device_pager set it because they create vm_page_t's on the
fly that do not have pv_entries.  This makes it easier to "unmanage" a
page of physical memory (this will be taken advantage of in subsequent
commits).

Add a function to add a new page to the freelist.  This could be used
for reclaiming the previously wasted pages left over from preloaded
loader(8) files.

Reviewed by:	dillon

1 files changed, 2 insertions, 4 deletions

diff --git a/sys/cam/scsi/scsi_da.c b/sys/cam/scsi/scsi_da.c
index 94ed4afc4fa7..2d9bb6d1ba91 100644
--- a/sys/cam/scsi/scsi_da.c
+++ b/sys/cam/scsi/scsi_da.c
@@ -617,11 +617,9 @@ dadump(dev_t dev)
 	while (num > 0) {
 
 		if (is_physical_memory(addr)) {
-			pmap_enter(kernel_pmap, (vm_offset_t)CADDR1,
-				   trunc_page(addr), VM_PROT_READ, TRUE);
+			pmap_kenter((vm_offset_t)CADDR1, trunc_page(addr));
 		} else {
-			pmap_enter(kernel_pmap, (vm_offset_t)CADDR1,
-				   trunc_page(0), VM_PROT_READ, TRUE);
+			pmap_kenter((vm_offset_t)CADDR1, trunc_page(0));
 		}
 
 		xpt_setup_ccb(&csio.ccb_h, periph->path, /*priority*/1);