Commit Graph

565 Commits

Author SHA1 Message Date
thorpej 338e636672 Allow pmap_copy_page() and pmap_zero_page() to be #define'd
in <machine/pmap.h>.
2002-04-10 00:40:45 +00:00
manu 8645636b04 Updated comment to reflect the creation of uvm_swap_stats() 2002-04-01 12:24:11 +00:00
nathanw a1be32226e In amap_pp_adjref(), avoid incorrectly merging the first two chunks in
a ppref array when the range being adjusted includes the beginning of
the array.
2002-03-28 06:06:29 +00:00
manu da6e8ccbe8 Don't allocate struct swapent when we only need a struct oswapent. 2002-03-26 11:50:26 +00:00
chs f80ed5892c remove PGO_WEAK, it isn't needed anymore. 2002-03-25 02:08:09 +00:00
chs 76cacb8710 when processing PG_RDONLY, mask off VM_PROT_WRITE instead of hard-wiring
VM_PROT_READ (since we might have VM_PROT_EXEC too).  this fixes problems
running binaries out of NFS on macppc.  yet another fix courtesy of enami.
2002-03-25 01:56:48 +00:00
darrenr 256089809f Return EFBIG from mmap() if we try to map too much data and in the fixed
address allocation, return EOVERFLOW to match with the non-fixed error.
2002-03-22 11:06:33 +00:00
manu 2debbde786 Move swapctl(SWAP_STATS) implementation to a separate function called
uvm_swap_stats(). This is done in order to allow COMPAT_* swapctl()
emulation to use it directly without going through sys_swapctl().

The problem with using sys_swapctl() there is that it involves
copying the swapent array to the stackgap, and this array's size
is not known at build time. Hence it would not be possible to
 ensure it would fit in the stackgap in any case.
2002-03-18 11:43:01 +00:00
thorpej 1f6482dd1e Remove PR_MALLOCOK. 2002-03-09 07:28:20 +00:00
chs 87185156fd a vm_prot_t is a bit-mask, fix an assertion which was treating one
more like an enumerated type.
2002-03-09 04:29:03 +00:00
thorpej a180cee23b Pool deals fairly well with physical memory shortage, but it doesn't
deal with shortages of the VM maps where the backing pages are mapped
(usually kmem_map).  Try to deal with this:

* Group all information about the backend allocator for a pool in a
  separate structure.  The pool references this structure, rather than
  the individual fields.
* Change the pool_init() API accordingly, and adjust all callers.
* Link all pools using the same backend allocator on a list.
* The backend allocator is responsible for waiting for physical memory
  to become available, but will still fail if it cannot callocate KVA
  space for the pages.  If this happens, carefully drain all pools using
  the same backend allocator, so that some KVA space can be freed.
* Change pool_reclaim() to indicate if it actually succeeded in freeing
  some pages, and use that information to make draining easier and more
  efficient.
* Get rid of PR_URGENT.  There was only one use of it, and it could be
  dealt with by the caller.

From art@openbsd.org.
2002-03-08 20:48:27 +00:00
thorpej 26b2d2217b If the bootstrapping process didn't actually use any KVA space, don't
reserve size of 0 in kernel_map.

From OpenBSD.
2002-03-07 20:15:32 +00:00
simonb c7339f8919 Include <sys/kernel.h> if UVMHIST is defined - the "cold" variable is
used in the UVMHIST_LOG macro.
Breakage reported by Chuck Silvers in private mail.
2002-03-05 05:45:54 +00:00
simonb 64c7743a05 Don't "extern int cold;" - this is in <sys/kernel.h>. 2002-03-04 02:19:07 +00:00
christos 894ca870b3 use the <sys/conf.h> macro to get the mmap footprint. 2002-02-28 21:00:23 +00:00
chs 2cce3ebcba honor the PG_RDONLY flag (so that NFS can clear the PG_NEEDCOMMIT flag
when page with it set is modified again).  fixes PR 15733.
2002-02-27 16:02:03 +00:00
chs 811c8fad2b in amap_pp_adjref(), avoid unnecessary fragmentation of the am_ppref array
by merging the first changed chunk with the last unchanged chunk if possible.
2002-02-25 00:39:16 +00:00
enami bb41d19bca In the function uvm_page_own(), clear owner_tag after assertion so that
we can see the owner when assertion failed.  Some indentation fix while
I'm here.
2002-02-20 07:06:56 +00:00
simonb fbaba2a978 Add a space after a comma in a few places (KNF). 2002-02-15 17:45:05 +00:00
wiz b36c0a5406 deamon -> daemon 2002-01-21 14:42:26 +00:00
chs b263a7eb4d add a new flag PMAP_CACHE_VIVT for the pmap to inform the MI code that
that the cache is virtually-indexed and virtually-tagged (such as on the ARM),
and use this flag in the UBC code to be more friendly to those caches.
2002-01-19 16:55:20 +00:00
chs e9a82c88ce in uvm_fault_unwire_locked(), if we find that a pmap entry is missing,
just skip that page.  this situation can arise legitimately when a file
with a wired mapping is truncated so that a wired page is no longer
part of the file.
2002-01-02 01:10:36 +00:00
chs a7ec5b4144 redo part of the last commit. 2002-01-01 22:18:39 +00:00
chs 43973be0c5 introduce a new UVM fault type, VM_FAULT_WIREMAX. this is different
from VM_FAULT_WIRE in that when the pages being wired are faulted in,
the simulated fault is at the maximum protection allowed for the mapping
instead of the current protection.  use this in uvm_map_pageable{,_all}()
to fix the problem where writing via ptrace() to shared libraries that
are also mapped with wired mappings in another process causes a
diagnostic panic when the wired mapping is removed.

this is a really obscure problem so it deserves some more explanation.
ptrace() writing to another process ends up down in uvm_map_extract(),
which for MAP_PRIVATE mappings (such as shared libraries) will cause
the amap to be copied or created.  then the amap is made shared
(ie. the AMAP_SHARED flag is set) between the kernel and the ptrace()d
process so that the kernel can modify pages in the amap and have the
ptrace()d process see the changes.  then when the page being modified
is actually faulted on, the object pages (from the shared library vnode)
is copied to a new anon page and inserted into the shared amap.
to make all the processes sharing the amap actually see the new anon
page instead of the vnode page that was there before, we need to
invalidate all the pmap-level mappings of the vnode page in the pmaps
of the processes sharing the amap, but we don't have a good way of
doing this.  the amap doesn't keep track of the vm_maps which map it.
so all we can do at this point is to remove all the mappings of the
page with pmap_page_protect(), but this has the unfortunate side-effect
of removing wired mappings as well.  removing wired mappings with
pmap_page_protect() is a legitimate operation, it can happen when a file
with a wired mapping is truncated.  so the pmap has no way of knowing
whether a request to remove a wired mapping is normal or when it's due to
this weird situation.  so the pmap has to remove the weird mapping.
the process being ptrace()d goes away and life continues.  then,
much later when we go to unwire or remove the wired vm_map mapping,
we discover that the pmap mapping has been removed when it should
still be there, and we panic.

so where did we go wrong?  the problem is that we don't have any way
to update just the pmap mappings that need to be updated in this
scenario.  we could invent a mechanism to do this, but that is much
more complicated than this change and it doesn't seem like the right
way to go in the long run either.

the real underlying problem here is that wired pmap mappings just
aren't a good concept.  one of the original properties of the pmap
design was supposed to be that all the information in the pmap could
be thrown away at any time and the VM system could regenerate it all
through fault processing, but wired pmap mappings don't allow that.
a better design for UVM would not require wired pmap mappings,
and Chuck C. and I are talking about this, but it won't be done
anytime soon, so this change will do for now.

this change has the effect of causing MAP_PRIVATE mappings to be
copied to anonymous memory when they are mlock()d, so that uvm_fault()
doesn't need to copy these pages later when called from ptrace(), thus
avoiding the call to pmap_page_protect() and the panic that results
from this when the mlock()d region is unlocked or freed.  note that
this change doesn't help the case where the wired mapping is MAP_SHARED.

discussed at great length with Chuck Cranor.
fixes PRs 10363, 12554, 12604, 13041, 13487, 14580 and 14853.
2001-12-31 22:34:39 +00:00
chs 23c75a9a98 in uvm_map_clean(), add PGO_CLEANIT to the flags passed to an object's pager.
we need to make sure that vnode pages are written to disk at least once,
otherwise processes could gain access to whatever data was previously stored
in disk blocks which are freshly allocated to a file.
2001-12-31 20:34:01 +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
chs 4d069e8517 in uvm_vnp_setsize(), wait for any i/o in progress on pages that we free. 2001-12-31 07:00:15 +00:00
enami d3efa85632 G/C no longer used saved credential for file i/o. 2001-12-16 04:51:34 +00:00
chs 4923ddfdda in sys_mincore(), check the return value of uvm_vslock() to determine
if the vec pointer is valid rather than using uvm_useracc().
uvm_useracc() just tells you if the permissions of a user mapping allow
the desired access, not whether faulting on that mapping will succeed.
2001-12-14 04:21:22 +00:00
thorpej 06920aef28 Move the code that walks the process's VM map during a coredump
into uvm_coredump_walkmap(), and use callbacks into the coredump
routine to do something with each section.
2001-12-10 01:52:26 +00:00
chs 8e9cdbbd63 replace "vnode" and "vtext" with "file" and "exec" in uvmexp field names. 2001-12-09 03:07:43 +00:00
chs 849c9b2bfd add {anon,file,exec}max as a upper bound on the amount of memory that
will be allocated for the respective usage types when there is contention
for memory.

replace "vnode" and "vtext" with "file" and "exec" in uvmexp field names
and sysctl names.
2001-12-09 03:07:19 +00:00
thorpej 205c159f0e Make the coredump routine exec-format/emulation specific. Split
out traditional NetBSD coredump routines into core_netbsd.c and
netbsd32_core.c (for COMPAT_NETBSD32).
2001-12-08 00:35:25 +00:00
enami 76858f7620 When initially allocating or extending arrays in struct uvm_amap,
adjust allocation size using malloc_roundup().  This eliminates many
unnecessary malloc/memcpy calls.
2001-12-05 01:33:09 +00:00
enami fbfa7f8e61 No need to zero clear after amap->am_bckptr[amap->am_nslot], since we're
clearing corresponding elements in an array amap->am_anon[].
2001-12-05 00:34:05 +00:00
chuck 00168f4ce0 fix bug in amap_wiperange() detected by enami tsugutomo.
loop control was wrong in one case.
2001-12-01 22:11:13 +00:00
chs 1b8f294146 disallow mapping negative offsets for both regular files and block devices. 2001-11-25 06:42:47 +00:00
enami b55b4c7df5 Zero clear an array of vm_page * before passing it to VOP_GETPAGES(). 2001-11-19 02:44:27 +00:00
lukem b616d1ca1d add RCSIDs, and in some cases, slightly cleanup #include order 2001-11-10 07:36:59 +00:00
chs 1d7213c91a only acquire the lock for swpgonly if we actually need to adjust it. 2001-11-07 14:07:23 +00:00
chs ac48df1681 only acquire the lock for swpgonly if we actually need to adjust it. 2001-11-07 08:43:32 +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
simonb 82649768b7 Change some unsigned int variables and parameters to plain ints so
that all usages of those agree on unsigned vs. signed.
2001-11-06 06:31:06 +00:00
simonb 819bb532e6 Remove some variables that are set but never used. 2001-11-06 06:28:22 +00:00
chs 6e1dd2fa31 add an assert and rename some variables. 2001-11-06 05:44:25 +00:00
chs d8cbdbb0da in uvm_exit(), don't bother to unwire the uarea before we free it,
the pages will be freed anyway.
2001-11-06 05:34:42 +00:00
chs 07d2ec83fe don't call pmap_copy() from uvmspace_fork().
a new process is very likely to call execve() immediately after fork(),
so most of the time copying the pmap mappings is wasted effort.
2001-11-06 05:27:17 +00:00
chs 550caf0ce3 allow SWAP_GETDUMPDEV for all users.
use {LIST,TAILQ}_FOREACH where appropriate.
2001-11-01 03:49:30 +00:00
thorpej f67e15c839 uvm_map_protect(): Don't allow VM_PROT_EXECUTE to be set on entries
(either the current protection or the max protection) that reference
vnodes associated with a file system mounted with the NOEXEC option.

uvm_mmap(): Don't allow PROT_EXEC mappings to be established of vnodes
which are associated with a file system mounted with the NOEXEC option.
2001-10-30 19:05:26 +00:00
thorpej a2cd7623d4 Correct a comment. 2001-10-30 18:52:17 +00:00