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freebsd/sys/dev/ata
Peter Wemm 0385347c1a 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
2000-05-21 12:50:18 +00:00
..
ata-all.c Separate the struct bio related stuff out of <sys/buf.h> into 2000-05-05 09:59:14 +00:00
ata-all.h Add support for ATA66 on newer revisions of the VIA 82C596 2000-04-09 15:08:27 +00:00
ata-disk.c Implement an optimization of the VM<->pmap API. Pass vm_page_t's directly 2000-05-21 12:50:18 +00:00
ata-disk.h Complete the bio/buf divorce for all code below devfs::strategy 2000-04-15 05:54:02 +00:00
ata-dma.c Separate the struct bio related stuff out of <sys/buf.h> into 2000-05-05 09:59:14 +00:00
atapi-all.c Remove unneeded <sys/buf.h> includes. 2000-04-18 15:15:39 +00:00
atapi-all.h Make ATAPI CD changer devices work, hopefully better than before. 2000-03-21 13:26:54 +00:00
atapi-cd.c Separate the struct bio related stuff out of <sys/buf.h> into 2000-05-05 09:59:14 +00:00
atapi-cd.h Complete the bio/buf divorce for all code below devfs::strategy 2000-04-15 05:54:02 +00:00
atapi-fd.c Separate the struct bio related stuff out of <sys/buf.h> into 2000-05-05 09:59:14 +00:00
atapi-fd.h Complete the bio/buf divorce for all code below devfs::strategy 2000-04-15 05:54:02 +00:00
atapi-tape.c Separate the struct bio related stuff out of <sys/buf.h> into 2000-05-05 09:59:14 +00:00
atapi-tape.h Complete the bio/buf divorce for all code below devfs::strategy 2000-04-15 05:54:02 +00:00