Commit Graph

8 Commits

Author SHA1 Message Date
David Greenman
9dc4f38bff Rewrote rlist_free(). The previous code was a good example of how to
write software wrong. rlist_alloc() needs a rewrite, too, but this will
have to wait.
1995-01-31 06:48:53 +00:00
Poul-Henning Kamp
797f2d22f0 All of this is cosmetic. prototypes, #includes, printfs and so on. Makes
GCC a lot more silent.
1994-10-02 17:35:40 +00:00
Garrett Wollman
f540b1065a Change all #includes to follow the current Berkeley style. Some of these
``changes'' are actually not changes at all, but CVS sometimes has trouble
telling the difference.

This also includes support for second-directory compiles.  This is not
quite complete yet, as `config' doesn't yet do the right thing.  You can
still make it work trivially, however, by doing the following:

rm /sys/compile
mkdir /usr/obj/sys/compile
ln -s M-. /sys/compile
cd /sys/i386/conf
config MYKERNEL
cd ../../compile/MYKERNEL
ln -s /sys @
rm machine
ln -s @/i386/include machine
make depend
make
1994-08-13 03:50:34 +00:00
David Greenman
33811d39ec First round of changes from John Dyson and myself to the VM system. This
set improves performance and fixes the following problems (description
from John Dyson):

1.	Growing swap space problem in both static usage and
	in situations with lots of fork/execs in heavy paging
	situations.

2.	Sparse swap space allocation (internal fragmentation.)

3.	General swap_pager slowness.

Additionally, the new swap_pager also provides hooks for multi-page
I/O that is currently being developed (in early testing phases.)

Problem #1 is a result of a problem where objects cannot be collapsed
once a pager has been allocated for them.  This problem has been solved
by relaxing the restriction by allowing the pages contained in a shadow
object's pager be copied to the parent object's pager.  The copy is
afforded by manipulating pointers to the disk blocks on the swap space.
Since an improved swap_pager has already been developed with the data
structures to support the copy operation, this new swap_pager has been
introduced.  Also, shadow object bypass in the collapse code has been
enhanced to support checking for pages on disk.  The vm_pageout daemon
has also been modified to defer creation of an object's pager when the
object's shadow is paging.  This allows efficient immediate collapsing
of a shadow into a parent object under many circumstances without the
creation of an intermediate pager.

Problem #2 is solved by the allocation data structures and algorithms
in the new swap_pager.  Additionally, a newer version of this new swap_pager
is being tested that permits multiple page I/O and mitigation of the
fragmentation problems associated with allocation of large contiguous blocks
of swap space.

Problem #3 is addressed by better algorithms and a fix of a couple of bugs
in the swap_pager.  Additionally, this new pager has a growth path allowing
multi-page inputs from disk.  Approximately 50% performance improvement can
be expected under certain circumstances when using this pager in the standard
single page mode.

(Actually, I've seen more like twice the speed in my tests. -DLG)
1993-12-22 12:51:39 +00:00
Garrett Wollman
aaf08d94ca Make everything compile with -Wtraditional. Make it easier to distribute
a binary link-kit.  Make all non-optional options (pagers, procfs) standard,
and update LINT to reflect new symtab requirements.

NB: -Wtraditional will henceforth be forgotten.  This editing pass was
primarily intended to detect any constructions where the old code might
have been relying on traditional C semantics or syntax.  These were all
fixed, and the result of fixing some of them means that -Wall is now a
realistic possibility within a few weeks.
1993-12-19 00:55:01 +00:00
Garrett Wollman
381fe1aaf4 Make the LINT kernel compile with -W -Wreturn-type -Wcomment -Werror, and
add same (sans -Werror) to Makefile for future compilations.
1993-11-25 01:38:01 +00:00
Rodney W. Grimes
b8b4b679c0 Removed all patch kit headers, sccsid and rcsid strings, put $Id$ in, some
minor cleanup.  Added $Id$ to files that did not have any version info, etc
1993-10-16 15:24:44 +00:00
Rodney W. Grimes
5b81b6b301 Initial import, 0.1 + pk 0.2.4-B1 1993-06-12 14:58:17 +00:00