Commit Graph

39 Commits

Author SHA1 Message Date
chs b1b5af79c2 when dropping a kernel loan, if this was the last loan-to-kernel but
the page is still loaned to an anon, we should put the page back on a
paging queue.  this is because while pages loaned to the kernel really
do need to stay resident (since the kernel is accessing the physical
memory directly), pages loaned to anons can be paged out just fine.
(the page will be paged out twice, first to the object and then again
to the anon, but after that the page can be reused.)
2002-07-14 23:53:41 +00:00
enami 9e1deeab34 Add missing pageq lock while uvm_pagefree() is called (either directly
or indirectly).  Reviewed by chuq.
2002-05-29 11:04:39 +00:00
enami c4e1385f55 Fetch the right page from a file even if it is mapped from middle of it.
This makes `tail -<N> <FILE> | cat > file' correctly, where <FILE> is
a regular file larger than 10Mbytes (makes tail to map part of file)
and <N> is big enough to produce output larger than 8kbytes (makes pipe
to use page loan facility).  Problem reported by FUKAUMI Naoki on japanese
local mailing list.
2002-05-07 02:29:52 +00:00
chs ef57a67ca1 fix locking for loaning. in general we should be looking at the page's
uobject and uanon pointers rather than at the PQ_ANON flag to determine
which lock to hold, since PQ_ANON can be clear even when the anon's lock
is the one which we should hold (if the page was loaned from an object
and then freed by the object).
2001-12-31 19:21:36 +00:00
lukem b616d1ca1d add RCSIDs, and in some cases, slightly cleanup #include order 2001-11-10 07:36:59 +00:00
chs 2ed88fe090 several changes prompted by loaning problems:
- fix the loaned case in uvm_pagefree().
 - redo uvmexp.swpgonly accounting to work with page loaning.
   add an assertion before each place we adjust uvmexp.swpgonly.
 - fix uvm_km_pgremove() to always free any swap space associated with
   the range being removed.
 - get rid of UVM_LOAN_WIRED flag.  instead, we just make sure that
   pages loaned to the kernel are never on the page queues.
   this allows us to assert that pages are not loaned and wired
   at the same time.
 - add yet more assertions.
2001-11-06 08:07:49 +00:00
jdolecek 8573719e3d add new UVM_LOAN_WIRED flag - the memory pages loaned in TOPAGE case
are only wired if this flag is present (i.e. they are not wired by default now)
loaned pages are unloaned via new uvm_unloan(), uvm_unloananon() and
uvm_unloanpage() are no longer exported
adjust uvm_unloanpage() to unwire the pages if UVM_LOAN_WIRED is specified
mark uvm_loanuobj() and uvm_loanzero() static also in function implementation

kern/sys_pipe.c: uvm_unloanpage() --> uvm_unloan()
2001-09-22 05:58:04 +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
chuck 2dec1a929d handle a locking problem where the second (or later) call in the loanentry
loop returns 0.   loanentry was returning >0, but was unlocking the maps
(because of the zero).   reworked to avoid this.  problem reported by
chuck silvers.   also clarify a comment that jdolecek asked about.
2001-08-27 02:34:29 +00:00
chs 2233d77cac when fetching an object page to loan out, do so synchronously. 2001-08-18 05:51:44 +00:00
chs 3845302904 remove trailing whitespace. 2001-05-25 04:06:11 +00:00
chuck 7074958a24 fix locking problem noted by Jaromir Dolecek. also, add more comments
on locking rules to make code easier to understand.   locking in
uvm_loananon still needs some work on fringe cases where anon's page
is actually on loan from a uobj.
2001-04-10 00:53:21 +00:00
jdolecek 5bd42953f7 Upon Chuck Cranor request, revert rev. 1.26. There is indeed a bug in way
locking is done, but this fix is not the right way to fix it.
2001-04-09 06:21:03 +00:00
jdolecek 17c0a84170 Remove superflous uvmfault_unlockmaps() in uvm_loan(), only call it
if uvm_loanentry() returned 0; otherwise, the unlocking would already
have been done by uvmfault_unlockall() call in  uvm_loanentry().
Okay'ed by Chuck Silvers
2001-04-08 16:51:51 +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
chs dd82ad8e2c eliminate the VM_PAGER_* error codes in favor of the traditional E* codes.
the mapping is:

VM_PAGER_OK		        0
VM_PAGER_BAD		        <unused>
VM_PAGER_FAIL		        <unused>
VM_PAGER_PEND		        0 (see below)
VM_PAGER_ERROR		        EIO
VM_PAGER_AGAIN		        EAGAIN
VM_PAGER_UNLOCK		        EBUSY
VM_PAGER_REFAULT	        ERESTART

for async i/o requests, it used to be possible for the request to
be convert to sync, and the pager would return VM_PAGER_OK or VM_PAGER_PEND
to indicate whether the caller should perform post-i/o cleanup.
this is no longer allowed; pagers must now return 0 to indicate that
the async i/o was successfully started, and the caller never needs to
worry about doing the post-i/o cleanup.
2001-03-10 22:46:45 +00:00
thorpej ad7259d7c6 Change uvm_analloc() to return a locked anon, update all callers,
and fix an anon locking protocol error in uvm_loanzero().
2001-01-23 02:27:39 +00:00
mrg dea44a9ec4 remove include of <vm/vm.h> 2000-06-27 17:29:17 +00:00
mrg 2f159a1bac remove/move more mach vm header files:
<vm/pglist.h> -> <uvm/uvm_pglist.h>
	<vm/vm_inherit.h> -> <uvm/uvm_inherit.h>
	<vm/vm_kern.h> -> into <uvm/uvm_extern.h>
	<vm/vm_object.h> -> nothing
	<vm/vm_pager.h> -> into <uvm/uvm_pager.h>

also includes a bunch of <vm/vm_page.h> include removals (due to redudancy
with <vm/vm.h>), and a scattering of other similar headers.
2000-06-26 14:20:25 +00:00
thorpej 345b3d2136 Use UVM_PGA_ZERO in a few (easy) places. 2000-04-10 00:32:46 +00:00
chs f3a668ed84 eliminate the PMAP_NEW option by making it required for all ports.
ports which previously had no support for PMAP_NEW now implement
the pmap_k* interfaces as wrappers around the non-k versions.
1999-09-12 01:16:55 +00:00
thorpej 3f176180d5 Garbage collect thread_sleep()/thread_wakeup() left over from the old
Mach VM code.  Also nuke iprintf(), which was no longer used anywhere.

Add proclist locking where appropriate.
1999-07-22 22:58:38 +00:00
thorpej 8c59c67288 Just say no to interrupt-safe maps. 1999-06-03 00:05:45 +00:00
thorpej 5920638afe Change the main comment block to indicate why PMAP_NEW (specifically,
pmap_kenter*()) is not required for {O,A}->K page loans.
1999-05-27 21:50:03 +00:00
chs f455dd6596 add a `flags' argument to uvm_pagealloc_strat().
define a flag UVM_PGA_USERESERVE to allow non-kernel object
allocations to use pages from the reserve.
use the new flag for allocations in pmap modules.
1999-04-11 04:04:04 +00:00
mrg a0139bc39d remove now >1 year old pre-release message. 1999-03-25 18:48:49 +00:00
chuck 44f5fc2839 cleanup/reorg:
- break anon related functions out of uvm_amap.c and put them in their own
  file (uvm_anon.c).  includes break up uvm_anon_init into an amap and an
  an anon init function
- ensure that only functions within the amap module access amap structure
  fields (add macros to amap api as needed)
1999-01-24 23:53:14 +00:00
chs 28411139b3 be consistent with locking of amaps and anons when freeing them. 1998-11-04 07:07:22 +00:00
chs 549cd579e5 shift by PAGE_SHIFT instead of multiplying or dividing by PAGE_SIZE. 1998-10-18 23:49:59 +00:00
chuck 03939069dc remove unused share map code from UVM:
- update uvm_faultinfo's rvaddr to orig_rvaddr to match changes from
	uvm_fault.h
1998-10-11 23:16:20 +00:00
eeh a2dd74ed79 Merge paddr_t changes into the main branch. 1998-08-13 02:10:37 +00:00
kleink 182e12f413 Remove inclusions of syscall (and syscall argument) related header files;
we don't need them here.
1998-05-05 20:51:04 +00:00
chuck e6da5a01e4 remove tmpwire arg from uvm_pagewire() -- it isn't needed anymore.
noted by chuck s.
1998-03-22 21:29:30 +00:00
mrg 8106d13596 KNF. 1998-03-09 00:58:55 +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 1f6b921cf7 restore rcsids 1998-02-07 11:07:38 +00:00
chs 098b8c2420 fix typoes in locking. 1998-02-07 02:17:48 +00:00
thorpej 9eb328b495 RCS ID police. 1998-02-06 22:26:13 +00:00
mrg f2caacc717 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 UVM kernel code portion.


this will be KNF'd shortly.  :-)
1998-02-05 06:25:08 +00:00