Commit Graph

527 Commits

Author SHA1 Message Date
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
thorpej e8ee04475d - Add a new vnode flag VEXECMAP, which indicates that a vnode has
executable mappings.  Stop overloading VTEXT for this purpose (VTEXT
  also has another meaning).
- Rename vn_marktext() to vn_markexec(), and use it when executable
  mappings of a vnode are established.
- In places where we want to set VTEXT, set it in v_flag directly, rather
  than making a function call to do this (it no longer makes sense to
  use a function call, since we no longer overload VTEXT with VEXECMAP's
  meaning).

VEXECMAP suggested by Chuq Silvers.
2001-10-30 15:32:01 +00:00
thorpej 7285b2c290 uvm_mmap(): If a vnode mapping is established with PROT_EXEC, mark the
vnode as VTEXT.

uvm_map_protect(): When VM_PROT_EXECUTE is added to a VA range, mark
all the vnodes mapped by the range as VTEXT.
2001-10-29 23:06:03 +00:00
chs dcd9e4a1ee add some missing spinlocks. 2001-10-21 00:04:42 +00:00
chs 4b887dad17 it is with great chagrin that I must fix yet another 64-bit math bug. 2001-10-16 05:56:23 +00:00
chs 1c97701b8b fix an uninitialized-variable problem in an error case.
pointed out by Simon Burge.
2001-10-15 00:37:51 +00:00
christos 7e19baba28 protect against traditional macro expansion. 2001-10-03 13:32:23 +00:00
chs 3aea6d69ad skip the MADV_SEQUENTIAL processing if we refault. fixes PR 14060. 2001-10-03 05:17:58 +00:00
chs 0c3dfee2f8 skip the swap-out code if there's no swap space configured.
avoid some hangs in low-memory situations.
2001-09-30 02:57:34 +00:00
chs 80373b7e54 don't depend on other headers to include sys/proc.h for us. 2001-09-28 11:59:51 +00:00
chs 365f4c4313 change the names of the arguments to uvn_put() to match their usage. 2001-09-26 07:23:51 +00:00
chs e37c6bf037 move call to pool_drain() outside the pageq lock. 2001-09-26 07:08:41 +00:00
chs a467bddfdc bump the rusage counter for "swaps" when we swap out a process.
addresses PR 6170.
2001-09-23 07:10:08 +00:00
chs 2adcba997b make pmap_resident_count() non-optional. 2001-09-23 06:35:30 +00:00
sommerfeld cc8633edd3 VOP_PUTPAGES must release the uobj's lock for us, so ensure it's locked
beforehand and unlocked afterwards using LOCK_ASSERT().
2001-09-22 22:33:16 +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 a548bfb584 add an assert. 2001-09-21 07:57:35 +00:00
chs 20a658f0ab work around swap-space/extent performance problem which causes
long pauses when processes with lots of swapped-out pages exit.
2001-09-19 03:41:46 +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
chris 0e7661f023 Update pmap_update to now take the updated pmap as an argument.
This will allow improvements to the pmaps so that they can more easily defer expensive operations, eg tlb/cache flush, til the last possible moment.

Currently this is a no-op on most platforms, so they should see no difference.

Reviewed by Jason.
2001-09-10 21:19:08 +00:00
chs 2133049a7c create a new pool for map entries, allocated from kmem_map instead of
kernel_map.  use this instead of the static map entries when allocating
map entries for kernel_map.  this greatly reduces the number of static
map entries used and should eliminate the problems with running out.
2001-09-09 19:38:22 +00:00
lukem 53156d96d0 let user know current value of MAX_KMAPENT in panic 2001-09-07 00:50:54 +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 a65671c2a9 don't mess with vnode holds or buffer lists for swap i/os.
fixes problems with leaked vnode holds.
2001-08-26 00:43:53 +00:00
chs ed1e153702 use the correct symbol for multi-include protection. 2001-08-25 20:37:46 +00:00
wiz c52d355d71 "wierd" is weird. 2001-08-20 12:20:01 +00:00
chs 2233d77cac when fetching an object page to loan out, do so synchronously. 2001-08-18 05:51:44 +00:00
chs 2c441082d4 allow mappings of VBLK vnodes. 2001-08-17 05:53:02 +00:00
chs 37f6c5155d call VOP_MMAP() before allowing mappings of vnodes to allow
filesystems which do not support memory mapped access to cause
mmap() of their vnodes to fail.
2001-08-17 05:52:46 +00:00
chs e9fbc91f95 user maps are always pageable. 2001-08-16 01:37:50 +00:00
matt cce919e025 Don't include <machine/pmap.h> and <machine/vmparam.h> if _KERNEL isn't
defined.  Include them explicitly in the few kvm_arch.c that need them.
2001-08-05 03:33:15 +00:00
thorpej ae69446f0f Back out previous -- christos needs to update his lint(1). 2001-07-25 23:05:04 +00:00
christos 8228035453 fix non-portable bitmap warning. 2001-07-25 22:41:10 +00:00
wiz a9356936b4 seperate -> separate 2001-07-22 13:33:58 +00:00
thorpej cbf41a143a bzero -> memset 2001-07-18 16:43:09 +00:00
matt f300898396 Add support for kern.maxphys, vm.maxslp, vm.uspace (the later two for ps). 2001-07-14 06:36:01 +00:00
thorpej c3cd2c3cfc Rather than using u_shorts, use u_ints and bitfields in the vm_page. This
provides us more flexibility with pageq-locked fields, and clarifies the
locking semantics for platforms which cannot address shorts.

From Ross Harvey.
2001-06-28 00:26:38 +00:00
thorpej 8217ab697c Since a page can be on only one of ACTIVE or INACTIVE queues at
any given time, turn two consecutive if statements into an if-else-if
construct.
2001-06-27 23:57:16 +00:00
thorpej 27f66d3bf7 Macro'ize the code that checks the free and inactive thresholds and
wakes the pagedaemon.
2001-06-27 21:18:34 +00:00