Commit Graph

51 Commits

Author SHA1 Message Date
lukem adc783d537 add RCSIDs 2001-11-12 15:25:01 +00:00
chs 64c6d1d2dc a whole bunch of changes to improve performance and robustness under load:
- remove special treatment of pager_map mappings in pmaps.  this is
   required now, since I've removed the globals that expose the address range.
   pager_map now uses pmap_kenter_pa() instead of pmap_enter(), so there's
   no longer any need to special-case it.
 - eliminate struct uvm_vnode by moving its fields into struct vnode.
 - rewrite the pageout path.  the pager is now responsible for handling the
   high-level requests instead of only getting control after a bunch of work
   has already been done on its behalf.  this will allow us to UBCify LFS,
   which needs tighter control over its pages than other filesystems do.
   writing a page to disk no longer requires making it read-only, which
   allows us to write wired pages without causing all kinds of havoc.
 - use a new PG_PAGEOUT flag to indicate that a page should be freed
   on behalf of the pagedaemon when it's unlocked.  this flag is very similar
   to PG_RELEASED, but unlike PG_RELEASED, PG_PAGEOUT can be cleared if the
   pageout fails due to eg. an indirect-block buffer being locked.
   this allows us to remove the "version" field from struct vm_page,
   and together with shrinking "loan_count" from 32 bits to 16,
   struct vm_page is now 4 bytes smaller.
 - no longer use PG_RELEASED for swap-backed pages.  if the page is busy
   because it's being paged out, we can't release the swap slot to be
   reallocated until that write is complete, but unlike with vnodes we
   don't keep a count of in-progress writes so there's no good way to
   know when the write is done.  instead, when we need to free a busy
   swap-backed page, just sleep until we can get it busy ourselves.
 - implement a fast-path for extending writes which allows us to avoid
   zeroing new pages.  this substantially reduces cpu usage.
 - encapsulate the data used by the genfs code in a struct genfs_node,
   which must be the first element of the filesystem-specific vnode data
   for filesystems which use genfs_{get,put}pages().
 - eliminate many of the UVM pagerops, since they aren't needed anymore
   now that the pager "put" operation is a higher-level operation.
 - enhance the genfs code to allow NFS to use the genfs_{get,put}pages
   instead of a modified copy.
 - clean up struct vnode by removing all the fields that used to be used by
   the vfs_cluster.c code (which we don't use anymore with UBC).
 - remove kmem_object and mb_object since they were useless.
   instead of allocating pages to these objects, we now just allocate
   pages with no object.  such pages are mapped in the kernel until they
   are freed, so we can use the mapping to find the page to free it.
   this allows us to remove splvm() protection in several places.

The sum of all these changes improves write throughput on my
decstation 5000/200 to within 1% of the rate of NetBSD 1.5
and reduces the elapsed time for "make release" of a NetBSD 1.5
source tree on my 128MB pc to 10% less than a 1.5 kernel took.
2001-09-15 20:36:31 +00:00
wiz f1bde32520 s/necesary/necessary/ 2001-07-24 16:43:02 +00:00
wiz cc0b68092e Correct various misspellings of 'transfer' and inflected forms. 2001-07-08 18:06:42 +00:00
chs ac3bc537bd eliminate the KERN_* error codes in favor of the traditional E* codes.
the mapping is:

KERN_SUCCESS			0
KERN_INVALID_ADDRESS		EFAULT
KERN_PROTECTION_FAILURE		EACCES
KERN_NO_SPACE			ENOMEM
KERN_INVALID_ARGUMENT		EINVAL
KERN_FAILURE			various, mostly turn into KASSERTs
KERN_RESOURCE_SHORTAGE		ENOMEM
KERN_NOT_RECEIVER		<unused>
KERN_NO_ACCESS			<unused>
KERN_PAGES_LOCKED		<unused>
2001-03-15 06:10:32 +00:00
augustss 246260555f Use correct type for todo variable.
Use more explicit panics messages.
2000-12-08 02:25:50 +00:00
chs aeda8d3b77 Initial integration of the Unified Buffer Cache project. 2000-11-27 08:39:39 +00:00
ad 50cf734d26 (*minphys)() musn't return zero. 2000-09-29 13:27:12 +00:00
mrg 32aa199ccf remove include of <vm/vm.h> 2000-06-27 17:41:07 +00:00
thorpej bfca0515b2 __predict_false() uvm_useracc() failure. 2000-05-08 20:03:20 +00:00
simonb 9ff7681a33 Don't need to include <sys/conf.h> here. 2000-03-29 03:43:31 +00:00
thorpej 445e42d77a One small piece from UBC: create a pool for I/O buffers. One small piece
not from UBC: make physio use it instead of its own home-grown thing.
2000-02-14 20:12:02 +00:00
thorpej e3d3905ac7 Preserve B_ORDERED. 2000-01-21 23:21:46 +00:00
fvdl 0b1963121a Add Kirk McKusick's soft updates code to the trunk. Not enabled by
default, as the copyright on the main file (ffs_softdep.c) is such
that is has been put into gnusrc. options SOFTDEP will pull this
in. This code also contains the trickle syncer.

Bump version number to 1.4O
1999-11-15 18:49:07 +00:00
thorpej 12347b2657 Make uvm_vslock() return the error code from uvm_fault_wire(). All places
which use uvm_vslock() should now test the return value.  If it's not
KERN_SUCCESS, wiring the pages failed, so the operation which is using
uvm_vslock() should error out.

XXX We currently just EFAULT a failed uvm_vslock().  We may want to do
more about translating error codes in the future.
1999-06-17 15:47:22 +00:00
thorpej 701868a6c8 Pass the appropriate access_type to uvm_vslock() for the given physio
operation: B_READ == VM_PROT_READ|VM_PROT_WRITE, B_WRITE == VM_PROT_READ.
1999-05-26 01:08:03 +00:00
mrg d2397ac5f7 completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.
1999-03-24 05:50:49 +00:00
kleink f69591d12d Use of casts as lvalues is a GNU C extension; rearrange slightly. 1999-02-10 17:03:26 +00:00
perry 275d1554aa Abolition of bcopy, ovbcopy, bcmp, and bzero, phase one.
bcopy(x, y, z) ->  memcpy(y, x, z)
ovbcopy(x, y, z) -> memmove(y, x, z)
   bcmp(x, y, z) ->  memcmp(x, y, z)
  bzero(x, y)    ->  memset(x, 0, y)
1998-08-04 04:03:10 +00:00
kleink fe2d01988e Fix some arithmetics lossage on typeless pointers. 1998-05-08 18:18:55 +00:00
thorpej 73863dd3c9 Pass vslock() and vsunlock() a proc *, rather than implicitly operating
on curproc.
1998-04-30 06:28:57 +00:00
mrg d90485202c - add defopt's for UVM, UVMHIST and PMAP_NEW.
- remove unnecessary UVMHIST_DECL's.
1998-02-10 14:08:44 +00:00
mrg 1a8c7604f4 initial import of the new virtual memory system, UVM, into -current.
UVM was written by chuck cranor <chuck@maria.wustl.edu>, with some
minor portions derived from the old Mach code.  i provided some help
getting swap and paging working, and other bug fixes/ideas.  chuck
silvers <chuq@chuq.com> also provided some other fixes.

this is the rest of the MI portion changes.

this will be KNF'd shortly.  :-)
1998-02-05 07:59:28 +00:00
pk 153ccc307b Use PHOLD() and PRELE(), rather than manipulating p_holdcnt directly. 1997-05-19 10:43:28 +00:00
pk 7b9f9e5426 Check user access rights only if `uio_segflg' says it's a user space buffer. 1996-06-13 22:30:18 +00:00
christos 8a5b1b92e2 First pass at prototyping 1996-02-04 02:15:01 +00:00
mycroft ec64328797 Check for todo<0, done<0, and done>todo. 1995-10-10 02:51:45 +00:00
mycroft 80d7b0695a minphys() functions really should return void. 1995-08-12 20:30:45 +00:00
mycroft 605a125097 After an I/O operation completes, immediately set B_BUSY again. Also,
lower spl sooner, and remove an unneeded splbio()/splx() pair.
1995-07-27 02:37:12 +00:00
cgd b45221af72 prototype strategy and minphys, use & check minphys return value 1995-07-24 07:45:24 +00:00
mycroft 7263209ce6 Make each disk and tape driver define its own read and write functions.
Deprecate rawread() and rawwrite() completely.  Remove d_strategy from cdevsw to
force the abstraction barrier.
1995-07-04 07:15:28 +00:00
cgd cf92afd66e New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD' 1994-06-29 06:29:24 +00:00
mycroft 6c5092484b Eliminate use of b_bufsize, and instead pass an extra arg to v(un)mapbuf(),
to be consistent with vs)un)lock().
1994-06-28 22:21:16 +00:00
mycroft ff2e6e12a2 Set b_bufsize after the minphys routine is called. 1994-06-26 06:08:11 +00:00
mycroft 507802da61 Set b_bufsize, for use by v{,un}mapbuf(). 1994-06-16 00:54:18 +00:00
mycroft 0d8affb278 Turn P_NOSWAP and P_PHYSIO into a hold count, as suggested by a comment. 1994-06-15 19:59:21 +00:00
cgd b3fda1e8ec update with merged versions 1994-05-20 10:05:02 +00:00
cgd 47d5757075 4.4-Lite versions 1994-05-20 10:04:05 +00:00
mycroft 495d3519fa HPUXCOMPAT -> COMPAT_HPUX 1994-05-04 04:02:54 +00:00
cgd 3dda0064a5 Convert mount, vnode, and buf structs to use <sys/queue.h>. Also,
some knf and structure frobbing to do along with it.
1994-04-21 07:47:31 +00:00
cgd 1758eaf2cb kill hack for vfs_bio jolitz-ish hack 1994-01-27 07:45:21 +00:00
mycroft 21edb9924e Canonicalize all #includes. 1993-12-18 03:59:02 +00:00
pk e7356e6993 Use proc pointer passed in uio rather then curproc for credentials (should
perhaps be done for b_proc also).
1993-12-16 16:28:43 +00:00
pk 644f409712 Properly initialize the credentials fields in the buffer used in physio().
Actually use the credentials of `curproc' when doing IO (among other things,
this allows us to read /dev/drum when swapping on an NFS mounted file).
1993-12-07 23:46:13 +00:00
cgd 76dbc1192b new specfs.h and fifo.h locations 1993-11-12 05:54:12 +00:00
cgd 98bb5ccd73 if mincnt returns 0 (i.e. off end of disk, or something), punt. 1993-07-08 10:53:40 +00:00
cgd 0ffdd71a7e mark the buffer busy immediately when we acquire it,
also, sleep at a slightly higher priority (so says mw...)
1993-07-08 10:29:26 +00:00
andrew 0e6cb953ea ANSIfications - removed all implicit function return types and argument
definitions.  Ensured that all files include "systm.h" to gain access to
general prototypes.  Casts where necessary.
1993-06-27 06:01:27 +00:00
mycroft 0ee0a87c29 Fix uninitialized variable. 1993-06-24 21:34:54 +00:00
cgd b2285d45d0 special case raw disk handling return values 1993-06-22 05:19:14 +00:00