Commit Graph

47 Commits

Author SHA1 Message Date
chs 16f0ca3612 add support for ``swapctl -d'' (removing swap space).
improve handling of i/o errors in swap space.

reviewed by:  Chuck Cranor
2000-01-11 06:57:49 +00:00
thorpej 1da427a80a Change the pmap_enter() API slightly; pmap_enter() now returns an error
value (KERN_SUCCESS or KERN_RESOURCE_SHORTAGE) indicating if it succeeded
or failed.  Change the `wired' and `access_type' arguments to a single
`flags' argument, which includes the access type, and flags:

	PMAP_WIRED	the old `wired' boolean
	PMAP_CANFAIL	pmap_enter() is allowed to fail

If PMAP_CANFAIL is not specified, the pmap should behave as it always
has in the face of a drastic resource shortage: fall over dead.

Change the fault handler to deal with failure (which indicates resource
shortage) by unlocking everything, waiting for the pagedaemon to free
more memory, then retrying the fault.
1999-11-13 00:24:38 +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
cgd 4eb46531af make sure 'wide' fault handling is actually done only once per fault.
('narrow' was mistakenly set to FALSE instead of TRUE.)  Committed after
discussion with chuq.
1999-07-19 19:02:22 +00:00
thorpej ff05773b4a Back out the change I made yesterday. It seems to cause some trouble
for some folks.
1999-07-11 17:47:12 +00:00
thorpej a0555db3e0 Simplify uvm_fault_unwire_locked() a little. 1999-07-10 21:46:56 +00:00
thorpej 3ebbe095e0 Change the pmap_extract() interface to:
boolean_t pmap_extract(pmap_t, vaddr_t, paddr_t *);
This makes it possible for the pmap to map physical address 0.
1999-07-08 18:05:21 +00:00
thorpej 0288ffb53a pmap_change_wiring() -> pmap_unwire(). 1999-06-17 19:23:20 +00:00
thorpej f5a527bb4e Remove pmap_pageable(); no pmap implements it, and it is not really useful,
because pmap_enter()/pmap_change_wiring() (soon to be pmap_unwire())
communicate the information in greater detail.
1999-06-17 18:21:21 +00:00
thorpej d1d9b366cd When unwiring a range in uvm_fault_unwire_locked(), don't call
pmap_change_wiring(...,FALSE) unless the map entry claims the address
is unwired.  This fixes the following scenario, as described on
tech-kern@netbsd.org on Wed 6/16/1999 12:25:23:

	- User mlock(2)'s a buffer, to guarantee it will never become
	  non-resident while he is using it.

	- User then does physio to that buffer.  Physio calls uvm_vslock()
	  to lock down the pages and ensure that page faults do not happen
	  while the I/O is in progress (possibly in interrupt context).

	- Physio does the I/O.

	- Physio calls uvm_vsunlock().  This calls uvm_fault_unwire().

	  >>> HERE IS WHERE THE PROBLEM OCCURS <<<

	  uvm_fault_unwire() calls pmap_change_wiring(..., FALSE),
	  which now gives the pmap free reign to recycle the mapping
	  information for that page, which is illegal; the mapping is
	  still wired (due to the mlock(2)), but now access of the
	  page could cause a non-protection page fault (disallowed).

	  NOTE: This could eventually lead to a panic when the user
	  subsequently munlock(2)'s the buffer and the mapping info
	  has been recycled for use by another mapping!
1999-06-16 23:02:40 +00:00
thorpej b861180119 * Rename uvm_fault_unwire() to uvm_fault_unwire_locked(), and require that
the map be at least read-locked to call this function.  This requirement
  will be taken advantage of in a future commit.
* Write a uvm_fault_unwire() wrapper which read-locks the map and calls
  uvm_fault_unwire_locked().
* Update the comments describing the locking contraints of uvm_fault_wire()
  and uvm_fault_unwire().
1999-06-16 22:11:23 +00:00
thorpej 23c6eb95d3 Remove a incorrect-and-no-longer-relevant comment. 1999-06-16 18:43:28 +00:00
thorpej ee9703dea9 Add a macro to test if a map entry is wired. 1999-06-16 00:29:04 +00:00
thorpej 2c3dc83a64 Keep interrupt-safe maps on an additional queue. In uvm_fault(), if we're
looking up a kernel address, check to see if the address is on this
"interrupt-safe" list.  If so, return failure immediately.  This prevents
a locking screw if a page fault is taken on an interrupt-safe map in or
out of interrupt context.
1999-06-04 23:38:41 +00:00
thorpej acf81da21e A page fault on a non-pageable map is always fatal. 1999-06-02 23:26:21 +00:00
thorpej 8d8badbd8f Make uvm_fault_unwire() take a vm_map_t, rather than a pmap_t, for
consistency.  Use this opportunity for checking for intrsafe map use
in this routine (which is illegal).
1999-05-28 20:49:51 +00:00
thorpej 195c1a2741 Pass an access_type to uvm_fault_wire(), which it forwards on to
uvm_fault().
1999-05-26 00:32:42 +00:00
chs a5d3e8dae9 when wiring swap-backed pages, clear the PG_CLEAN flag before
releasing any swap resources.  if we don't do this, we can
end up with a clean, swap-backed page, which is illegal.
tracked down by Bill Sommerfeld, fixes PR 7578.
1999-05-19 06:14:15 +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
mycroft 671c65c6da Duuuh. Back and front pages should have an access_type of 0, since we don't
know they're going to be used.  What was I thinking??
1999-03-29 05:43:31 +00:00
mycroft 0ce76ca08b Reduce the access_type for copy-on-write pages in the front and back regions. 1999-03-28 21:48:50 +00:00
mycroft 8ed77cabd0 Fix a case I missed in the previous. 1999-03-28 21:01:25 +00:00
mycroft 4831b815f5 Only turn off VM_PROT_WRITE for COW pages; not VM_PROT_EXECUTE. 1999-03-28 19:53:49 +00:00
mycroft 31a2536cd0 Add a new `access type' argument to pmap_enter(). This indicates what type of
memory access a mapping was caused by.  This is passed through from uvm_fault()
and udv_fault(), and in most other cases is 0.
The pmap module may use this to preset R/M information.  On MMUs which require
R/M emulation, the implementation may preset the bits and avoid taking another
fault.  On MMUs which keep R/M information in hardware, the implementation may
preset its cached bits to speed up the next call to pmap_is_modified() or
pmap_is_referenced().
1999-03-26 21:58:39 +00:00
chs d97d75d81b add uvmexp.swpgonly and use it to detect out-of-swap conditions. 1999-03-26 17:34:15 +00:00
mrg a0139bc39d remove now >1 year old pre-release message. 1999-03-25 18:48:49 +00:00
mrg 08fd4f3f47 80 cols. 1999-01-31 09:27:18 +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
chuck cc2f45083b update outdated an_swslot comments 1998-11-20 19:37:06 +00:00
mrg 7c0d69c3ab minor KNF nits 1998-11-07 05:50:19 +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
tv 000978aaca Check for gcc the Right way when quashing -Wuninitialized goop. 1998-10-16 19:34:57 +00:00
chuck 1b59a238c4 remove unused share map code from UVM:
- simplify uvm_faultinfo in uvm_fault.h (parent map tracking no longer needed)
 - adjust locking and lookup functions in uvm_fault_i.h to reflect the above
 - replace ufi.rvaddr with ufi.orig_rvaddr in uvm_fault.c since rvaddr is
	no longer needed.
 - no need to worry about share map translations in uvm_fault().  simplify.
1998-10-11 23:07:42 +00:00
eeh a2dd74ed79 Merge paddr_t changes into the main branch. 1998-08-13 02:10:37 +00:00
mark 7689b22688 Use the sparc's GCC lossage fix for the arm32 port as well. Problem appears
to be a compiler bug resulting in an 'variable possibly used uninitialised'
warning when optimisation is used.
1998-06-02 20:51:24 +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 db81cc9c76 update per-process rusage fault counters (ru_majflt/ru_minflt) under UVM 1998-03-26 21:50:14 +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 0a058cb62f implement counters for pages paged in/out 1998-02-07 17:00:36 +00:00
mrg 1f6b921cf7 restore rcsids 1998-02-07 11:07:38 +00:00
chs 5a7c4f2caa don't try to relock amap if there isn't one. 1998-02-07 02:19:55 +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