Commit Graph

2095 Commits

Author SHA1 Message Date
jdolecek 026b142488 Change cache_lookup() as per discussion on tech-kern & ICB:
If the entry is found in name cache, cache_lookup() does all the
necessary locking now, simplifying the interface and making the
code easier to follow and maintain.

The code now also removes the entry from cache when it's either invalid
(vget() fails) or the vnode has been recycled while waiting for the lock.
In that case, unlock/relock of the directory vnode has been eliminated too.
Both changes could lead to sligh performace improvement in same cases.

Furthermore, obscure bug has been found and eliminated for ISDOTDOT in the
lockparent && ISLASTCN case: if the vget() succeded and the re-lock
of the directory vnode not, we returned the error with the '..' vnode still
locked.

For simplicity, cache_lookup() now returns 0 if the positive entry was found
in cache, -1 if not found and ENOENT or error returned by the locking
functions in any other case.

Many thanks to Bill Studenmund and especially Charles Hannum
for invaluable advices and code to get this right.

Tested by: jdolecek
Rewieved by: wrstuden, mycroft
1999-09-05 14:22:34 +00:00
jdolecek e49c7e1186 LMREADY: kill the DEBUG message "LKM: try ready"
LMLOADSYMS: print the DEBUG message only when (lkm_debug & LKMDB_LOAD)
1999-09-03 17:07:52 +00:00
bouyer 051211ffa9 Add a new flag, used by vn_open() which prevent symlinks from being followed
at open time. Use this to prevent coredump to follow symlinks when the
kernel opens/creates the file.
1999-08-31 12:30:35 +00:00
thorpej c2ce79c0c9 In _pool_put(), panic if we're put'ing with nout == 0. This will help us
detect a little earlier if we've dup-put'd.  Otherwise, underflow occurs,
and subsequent allocations simply hang or fail (it thinks the hardlimit
has been reached).
1999-08-29 00:26:01 +00:00
thorpej 8d4e2a9293 Make it possible to direct LOCKDEBUG messages to syslog only. 1999-08-27 01:14:38 +00:00
thorpej 0038e42900 Implement vlog() (varargs version of log()). 1999-08-27 01:14:15 +00:00
thorpej 4aafee104b Regen. 1999-08-25 05:06:31 +00:00
thorpej dc8ecaa15b Overhaul of the SVID IPC facilities, primarily to use the types specified
by the Single UNIX Specification version 2, rather than the SVR2-derived
types.  While I was here, I did a namespace sweep to expose the constants
and strucutures, and structure members described by SUSv2; documentation
updates coming shortly.

Fixes kern/8158.
1999-08-25 05:05:48 +00:00
thorpej 0174ee34d0 Add COMPAT_14. 1999-08-25 04:55:53 +00:00
wrstuden ba891a728d Deal with device vnodes which aren't on the spechash tables, rather than
panicing. So now we make sure vp->v_hashchain != NULL before removing
the node from the chain.
1999-08-20 22:21:25 +00:00
thorpej a21be175c5 Clean up some whitespace issues in the generated syscallargs.h file. 1999-08-20 19:07:31 +00:00
thorpej f2c2e160b1 Fix "print vnodes for dirty buffers" change: use vprint(); VOP_PRINT()
is only meant to be used by vprint(), and vprint() provides more
information about the vnode.
1999-08-19 18:09:44 +00:00
simonb c620766979 In vfs_shutdown() print any vnodes for busy buffers if DEBUG is defined.
Patch from Bill Studenmund.
1999-08-19 13:54:06 +00:00
tron 992156ec89 Remove the prototype for settime(), it is in "sys/time.h" now. 1999-08-16 18:53:55 +00:00
tron 35ba1291c8 Make settime() public because we need to use it for the Linux emulation. 1999-08-16 18:42:25 +00:00
ross 2f76dd5371 In getnewvnode(), initialize v_interlock when the vnode comes from the
pool allocator.
1999-08-14 06:23:59 +00:00
wrstuden 14693e0ca1 Modify comments regarding VOP_LOOKUP. Revised lookup description, and also
document both cases which can set PDIRUNLOCK.

Reviewed by Bill Sommerfeld.
1999-08-11 00:20:50 +00:00
thorpej cca4496da7 Use cpuid_t and cpu_number(). 1999-08-10 21:10:20 +00:00
ross ff87f817c1 Call stopprofclock(p) from sys_execve(). 1999-08-09 02:42:20 +00:00
thorpej eb20bbc780 Change the semantics of splsoftclock() to be like other spl*() functions,
that is priority is rasied.  Add a new spllowersoftclock() to provide the
atomic drop-to-softclock semantics that the old splsoftclock() provided,
and update calls accordingly.

This fixes a problem with using the "rnd" pseudo-device from within
interrupt context to extract random data (e.g. from within the softnet
interrupt) where doing so would incorrectly unblock interrupts (causing
all sorts of lossage).

XXX 4 platforms do not have priority-raising capability: newsmips, sparc,
XXX sparc64, and VAX.  This platforms still have this bug until their
XXX spl*() functions are fixed.
1999-08-05 18:08:08 +00:00
sommerfeld 2aa9696fee Implement arp_drain(), which frees packets tied up in the arp cache if
mbufs are in short supply.
Create a (trivial) protocol domain for arp so that the drain routine will
be called from m_reclaim()
1999-08-05 04:04:28 +00:00
sommerfeld b8e4538f80 Create new pool flag PR_LIMITFAIL, indicating that even PR_WAIT
allocations should fail if the pool is at its hard limit.
Document flag in pool(9).
Use it in mbuf.h for the first allocate call for M_GET, M_GETHDR, and
MCLGET, so that m_reclaim gets called even for blocking allocations.
1999-08-05 04:00:03 +00:00
thorpej 428443a130 Add some more diagnostic information to the 3 different `panic("m_copym")'
calls.
1999-08-05 02:24:29 +00:00
mycroft f85ee5e22e The old compaction test had an off-by-one error that caused it to not compact
in some cases where it could have.  Fix this, and the new version as well.
1999-08-04 22:33:20 +00:00
matt 0dc0497a97 Don't compress mbuf clusters which are referenced by multiple
mbufs since you might overwriting valuable data.  (think of
m_copy'ed data from a TCP re-transmission queue.  Since those
might be in clusters and referenced in two sockets).
1999-08-04 21:40:39 +00:00
mycroft 545d8679c0 It's now possible for sbcompress() to compact mbuf clusters, so do it.
This helps prevent mbuf cluster exhaustion when receiving lots of small
packets.
1999-08-04 21:30:12 +00:00
wrstuden 3bf14d81e9 Add support for fcntl(2) to generate VOP_FCNTL calls. Any fcntl
call with F_FSCTL set and F_SETFL calls generate calls to a new
fileop fo_fcntl. Add genfs_fcntl() and soo_fcntl() which return 0
for F_SETFL and EOPNOTSUPP otherwise. Have all leaf filesystems
use genfs_fcntl().

Reviewed by: thorpej
Tested by: wrstuden
1999-08-03 20:19:16 +00:00
wrstuden ae0b6372e0 Regen for revision: 1.19 of vnode_if.src. 1999-08-03 18:20:22 +00:00
wrstuden 5896b56eae Add VOP_FCNTL. 1999-08-03 18:19:08 +00:00
wrstuden cca0c4f6de Modify how lookup walks up mount points. As suggested by Konrad
Schroder <perseant@hitl.washington.edu>, unlock the mounted on
vnode before we call VFS_ROOT so that we cover the case where the new
root vnode shares a lock with the mounted-on vnode. Note that we have
asserted vfs_busy on the new fs before unlocking, so no other process can
steal the mount out from under us.
1999-08-03 18:17:24 +00:00
christos 93146392a8 OpenBSD patch to prevent non-root users who own block or character devices
(typically ttys or ptys) from changing the flags on them. [Commit by cjs.]
1999-07-31 03:18:43 +00:00
sommerfeld 3267e5e87d Probable fix for PR7943: lookups fail spuriously over NFS.
The problem was due to an interaction between the doomed unmounts done by
amd and getnewvnode.
I convinced myself that it's ok for getnewvnode() to do a sleeping vfs_busy().

Tested with multiple builds running while another process attempted to unmount
/usr once a second.
1999-07-29 13:31:45 +00:00
thorpej cb41412726 Fix a thinko in draining of spin locks: bump waitcount in the spin case,
too.  Remove some needless code duplication by adding a "drain" argument
to the ACQUIRE() macro (compiler can [and does] optimize the constant
conditional).
1999-07-28 19:29:39 +00:00
mellon a976011fcf - Correct the definition of the COUNT macro so that it takes the same
number of arguments when compiled without DIAGNOSTIC as with.
1999-07-28 01:59:46 +00:00
thorpej 0b1b32b6ff Make sure the kprintf_slock is initialized, and use the low-level atomic
locking primitive directly to lock it, since those will never attempt
to call printf() to display debugging information (and thus deadlock
on recursion into the kprintf_slock).
1999-07-27 21:50:37 +00:00
thorpej cd992b17df In _pool_put(), call simple_lock_freecheck() if we're LOCKDEBUG before
we put the item on the free list.
1999-07-27 21:31:17 +00:00
thorpej 6390046137 Improve the LOCKDEBUG code:
- Now compatible with MULTIPROCESSOR (requires other changes not yet
  committed, but which will be later today).
- In addition to tracking simple locks, track exclusive spin locks.
- Count spin locks like we do sleep locks (in the cpu_info for this
  CPU).
- Lock debug lists are now TAILQs, so as to make the locking order
  more obvious when dumping the list.

Also, some suggestions from Bill Sommerfeld:
- SIMPLELOCK_LOCKED and SIMPLELOCK_UNLOCKED constants, which may be
  defined in <machine/lock.h> (default to 1 and 0, respectively).  This
  makes it easier to support architectures which use test-and-clear
  rather than test-and-set.
- Add __attribute__((__aligned__)) to the `lock_data' member of the
  simplelock structure.  This makes it easier to support architectures
  which can only perform atomic operations on very-well-aligned memory
  locations.  NOTE: This changes the size of struct simplelock, and
  will cause a version bump.
1999-07-27 21:29:15 +00:00
thorpej c0e24db820 Use wakeup_one() for waking up sleep lock sleepers. 1999-07-26 23:02:53 +00:00
thorpej 1bd7bb28ea Implement wakeup_one(), which wakes up the highest priority process
first in line for the specified identifier.  For use in places where
you don't want a Thundering Herd.

While here, add an optimization to wakeup() suggested by Ross Harvey.
1999-07-26 23:00:58 +00:00
wrstuden eeefc02aec Add VLAYER to tests which will cause VOP_REVOKE to be called in sys_revoke(). 1999-07-26 19:20:09 +00:00
darrenr 8b165c84f7 don't log an error for ktrace if it's EPIPE - an error that should be
expected with fktrace/ktruss (i.e the error is `noise').
1999-07-25 13:59:08 +00:00
thorpej ea8fb3e04a Turn the proclist lock into a read/write spinlock. Update proclist locking
calls to reflect this.  Also, block statclock rather than softclock during
in the proclist locking functions, to address a problem reported on
current-users by Sean Doran.
1999-07-25 06:30:33 +00:00
thorpej 50f9f26fe1 Add a spin lock mode to the lock manager. Provides a read/write
spin lock facility.  Some code and ideas from Ross Harvey.
1999-07-25 06:24:22 +00:00
tron d5442d74c5 Fix NULL pointer access. Patch supplied by Dave Huang in PR kern/8055. 1999-07-24 15:10:02 +00:00
thorpej 014078a731 Garbage collect. 1999-07-22 23:31:07 +00:00
thorpej 2860ae9b30 Add proclist locking where appropriate (forgot to commit this file previously). 1999-07-22 23:00:27 +00:00
thorpej 01a8cffe77 Add a read/write lock to the proclists and PID hash table. Use the
write lock when doing PID allocation, and during the process exit path.
Use a read lock every where else, including within schedcpu() (interrupt
context).  Note that holding the write lock implies blocking schedcpu()
from running (blocks softclock).

PID allocation is now MP-safe.

Note this actually fixes a bug on single processor systems that was probably
extremely difficult to tickle; it was possible that schedcpu() would run
off a bad pointer if the right clock interrupt happened to come in the
middle of a LIST_INSERT_HEAD() or LIST_REMOVE() to/from allproc.
1999-07-22 21:08:30 +00:00
thorpej e8485145c1 Rearrange some code slightly. 1999-07-22 18:28:30 +00:00
thorpej 2715b812d1 Rework the process exit path, in preparation for making process exit
and PID allocation MP-safe.  A new process state is added: SDEAD.  This
state indicates that a process is dead, but not yet a zombie (has not
yet been processed by the process reaper).

SDEAD processes exist on both the zombproc list (via p_list) and deadproc
(via p_hash; the proc has been removed from the pidhash earlier in the exit
path).  When the reaper deals with a process, it changes the state to
SZOMB, so that wait4 can process it.

Add a P_ZOMBIE() macro, which treats a proc in SZOMB or SDEAD as a zombie,
and update various parts of the kernel to reflect the new state.
1999-07-22 18:13:36 +00:00
thorpej 32e1fd0d03 Move the call of cpu_wait() out of the wait4() functions, and into the
body of reaper(), right before the call to uvm_exit().  cpu_wait() must
be done before uvm_exit() because the resources it frees might be located
in the PCB.
1999-07-20 21:54:05 +00:00
chs fce05250f9 more cleanup:
remove simplelockrecurse, lockpausetime and PAUSE():
none of these serve any purpose anymore.
in the LOCKDEBUG functions, expand the splhigh() region to
cover the entire function.  without this there can still be races.
1999-07-19 03:21:11 +00:00
chs 327e64d87b remove simplelockrecurse, it's no longer needed. 1999-07-19 03:17:42 +00:00
thorpej c581bf97c5 A few things to make the Linux clone(2) emulation work a bit better:
- When the exit signal is specified to be 0, don't just assume they
  meant SIGCHLD.  In the Linux world, this appears to mean "don't deliver
  an exit signal at all".
- Simplify P_EXITSIG(); don't check against initproc here, just change
  the exit signal to SIGCHLD if reparenting to initproc.

A very simple clone(2) test program now works, and the MpegTV package
starts, but doesn't run properly yet (I believe there is a separate
bug which keeps it from working properly).
1999-07-15 23:18:41 +00:00
wrstuden a0f2937049 Define VLAYER and make layered fs's set this flag when creating their vnodes.
getnewvnode now checks this bit, and it if's set makes sure a vnode's not
locked before removing it from the free list.

Closes PR 7954 by Alan Barrett <apb@iafrica.com>.
1999-07-15 21:30:31 +00:00
thorpej 5fdbf26214 Regen. 1999-07-12 23:01:47 +00:00
thorpej bee019244f Remove two lines that were apparently added by accident. 1999-07-12 23:01:27 +00:00
kleink dfa5aad003 Regen. 1999-07-12 22:04:00 +00:00
kleink e79a283e47 XSH5: change function signature to `void *sbrk(intptr_t)'. 1999-07-12 21:55:19 +00:00
sommerfeld c4fe7934c5 Fix kern/7944: getcwd permission checking was overly restrictive.
(Don't require start directory to have read permission).
1999-07-11 09:27:23 +00:00
thorpej f9a7668b3f defopt IPSEC and IPSEC_ESP (both into opt_ipsec.h). 1999-07-09 22:57:15 +00:00
wrstuden 379a26972f Modify file systems to deal with struct lock in struct vnode. All leaf
fs's other than nfs use genfs_lock() for locking.

Modify lookup routines to set PDIRUNLOCK when they unlock the parrent.
1999-07-08 01:05:58 +00:00
wrstuden 332bef3064 Regen to reflect WILLPUT & WILLUNLOCK syntax. 1999-07-07 23:33:50 +00:00
wrstuden 99a1c75bcb Update syntax to support WILLUNLOCK and WILLPUT syntax. Change calls which
really vput to indicate that rather than just WILLRELE.
1999-07-07 23:32:50 +00:00
ws 974de8f7f8 Handle misalignment in vmcmd_map_readvn and vmcmd_map_zero correctly. 1999-07-07 20:23:45 +00:00
thorpej 7b3258b6a7 Make the kthread API a bit more friendly to loadable kernel modules. 1999-07-06 21:44:09 +00:00
sommerfeld 140b1ee075 Housecleaning time:
Fix and document naming convention for vnode variables (always use
lvp/lvpp and uvp/uvpp instead of a hash of cvp, vpp, dvpp, pvp, pvpp).

Delete old stale #if 0'ed code at the end.

Change error path code in getcwd_getcache() slightly (merge common
cleanup code; shouldn't affect behavior any).
1999-07-04 20:16:57 +00:00
sommerfeld e303e2ee8b Fix kern/7906: race between unmount and getnewvnode()
mp->mnt_flags & MNT_MWAIT is replaced by mp->mnt_wcnt, and a new mount
flag MNT_GONE is created (reusing the same bit).

In insmntque(), add DIAGNOSTIC check to fail if the filesystem vnode
is being moved to is in the process of being unmounted.

getnewvnode() now protects the list of vnodes active on mp with
vfs_busy()/vfs_unbusy().

To avoid generating spurious errors during a doomed unmount, change
the "wait for unmount to finish" protocol between dounmount() and
vfs_busy().  In vfs_busy(), instead of only sleeping once, sleep until
either MNT_UNMOUNT is clear or MNT_GONE is set; also, maintain a count
of waiters in mp->mnt_wcnt so that dounmount() knows when it's safe to
free mp.

tested by running a "while :; do mount /d1; umount -f /d1; done" loop
against multiple find(1) processes.
1999-07-04 16:20:12 +00:00
sommerfeld 6f57fc7820 fix typo in previous 1999-07-04 06:17:52 +00:00
sommerfeld c7e5c39191 Don't permanently lose the async bit on an failed unmount 1999-07-04 06:16:29 +00:00
wrstuden b101a0685c Make fhopen use FILE_UNUSE, and don't leak file descriptors.
Patch from Jason Thorpe. Also should close PR 7889 from
Assar Westerlund <assar@sics.se> describing this problem.
1999-07-01 18:58:16 +00:00
itojun 118d2b1d4f IPv6 kernel code, based on KAME/NetBSD 1.4, SNAP kit 19990628.
(Sorry for a big commit, I can't separate this into several pieces...)
Pls check sys/netinet6/TODO and sys/netinet6/IMPLEMENTATION for details.

- sys/kern: do not assume single mbuf, accept chained mbuf on passing
  data from userland to kernel (or other way round).
- "midway" ATM card: ATM PVC pseudo device support, like those done in ALTQ
  package (ftp://ftp.csl.sony.co.jp/pub/kjc/).
- sys/netinet/tcp*: IPv4/v6 dual stack tcp support.
- sys/netinet/{ip6,icmp6}.h, sys/net/pfkeyv2.h: IETF document assumes those
  file to be there so we patch it up.
- sys/netinet: IPsec additions are here and there.
- sys/netinet6/*: most of IPv6 code sits here.
- sys/netkey: IPsec key management code
- dev/pci/pcidevs: regen

In my understanding no code here is subject to export control so it
should be safe.
1999-07-01 08:12:45 +00:00
itojun 9765602d90 add PR_LISTEN for UNIX domain socket, SOCK_STREAM case. 1999-07-01 07:59:57 +00:00
darrenr cd92b615fa fix sys_accept() to return EOPNOTSUPP for protocols which don't support
listen/accept (PR_LISTEN flag in protosw) and detect obvious faults in
parameters passed.  It is still possible for the address used for copying
the socket information to become invalid between that check and the copyout
so close the connection's allocated fd if the copyout fails so that we can
return EFAULT without allocating an fd and the application not knowing about
it.  Ideally we'd be able to queue the connection back up so a later accept
could retrieve it but unfortunately that's not possible.
1999-07-01 05:56:32 +00:00
is b4b3d042fd Only check for ETXTBSY if the access would otherwise be allowed.
Needed to fix pr4134.
1999-06-30 10:00:06 +00:00
fvdl 811a6162c3 Allow execution of shared objects. This is silly, but is allowed in,
for example, Solaris and Linux, and at least one Linux ldd implementation
even depends on it.
1999-06-29 23:39:06 +00:00
wrstuden 6e06666498 Add fhopen, fhstat, fhstatfs syscalls. Also move getfh in from the nfs
syscall code.
1999-06-29 22:18:47 +00:00
wrstuden a9e728797e regen. 1999-06-29 22:17:39 +00:00
wrstuden d55b282c54 Add fhopen, fhstat, fhstatfs. 1999-06-29 22:15:31 +00:00
ross d13c150e3b include <string.h> for memset(3) when compiling userland test setup 1999-06-27 06:18:33 +00:00
augustss 94b815050e Add powerhooks, i.e., the ability to register a function that will be
called when the machine does a suspend or resume.
XXX Will go away when Jason's kevents come to life.
1999-06-26 08:25:25 +00:00
kleink 7b67bca335 Add compile-time and run-time feature test knobs for the 1003.1 Mapped Files,
Process Memory Locking, Range Memory Locking and Memory Protection options.
1999-06-24 14:18:10 +00:00
sommerfeld c45e268d01 Fix PR7373 for real: Rearrange locking to avoid need for LOCKPARENT in lookup 1999-06-21 05:11:09 +00:00
sommerfeld 8d750c058f regen (no actual change, but comments in the master file changed) 1999-06-21 02:30:53 +00:00
sommerfeld 9bad197221 Correct comment about how LOCKPARENT affects VOP_LOOKUP 1999-06-21 02:28:46 +00:00
christos c029fe53c6 Fix umask inheritance problem introduced by the cwdi changes, whereby
children processes will not inherit the parent's umask but 022.
1999-06-20 08:54:13 +00:00
ragge 5ad2718e7c Add vax to user of device_register. 1999-06-20 00:51:37 +00:00
sommerfeld 1425b5931b Fix PR7761: clip overly large length rather than failing 1999-06-19 18:01:26 +00:00
thorpej bbf19ba181 Um, hi, let's initialize pointers before we use them. 1999-06-17 23:17:45 +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 ad528dfdf0 Regen. 1999-06-15 23:29:17 +00:00
thorpej 0cec533f77 Add mlockall at #242 and munlockall at #243. 1999-06-15 23:28:16 +00:00
christos e13d964178 Regen 1999-06-09 04:25:54 +00:00
christos 3f8f92f2b4 Add EXCL keyword as described in tech_kern, and fix comments. Make the
vtrace syscall UNIMPL because it is.
1999-06-09 04:25:30 +00:00
thorpej c146fe969e Regen. 1999-06-08 03:08:32 +00:00
thorpej 8b35c542b5 mincore: caddr_t -> void * 1999-06-08 03:07:39 +00:00
thorpej 84380f9fbe In sosend(), if so_error is set, clear it before returning the error to
the process (i.e. pre-Reno behavior).  The 4.4BSD behavior (introduced
in Reno) caused transient errors to stick incorrectly.

This is from PR #7640 (Havard Eidnes), cross-checked w/ FreeBSD, where
Bill Fenner committed the same fix (as described in a comment in the
Vat sources, by Van Jacobsen).
1999-06-08 02:39:57 +00:00
thorpej 1c5f2999b2 Make sure `olddelta' is a valid pointer before performing the guts of
the adjtime(2) system call.  Fixes PR #7721, Darren Reed.
1999-06-07 22:33:53 +00:00
thorpej d76e7b8c6d Don't pass a nam2blk around at all; just have setroot() and friends reference
dev_name2blk[] directly.  Addresses PR #7622 (ITOH Yasufumi), although
in a different way.
1999-06-07 20:16:08 +00:00
thorpej 4476366369 Make sure the regression test compiles. 1999-06-07 02:25:05 +00:00
pk 62cb666f4a Guard our global resource `phpool' against all interrupts. 1999-06-06 22:20:15 +00:00
pk 0e286f5c1f Guard our global resource `expool' against all interrupts. 1999-06-06 22:14:53 +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
lukem 5e76cbddfb in humanize_number(), when printing a u_int64_t, use '%qu' (unsigned long long)
instead of '%qd' (long long)
1999-06-02 05:53:56 +00:00
lukem 6a62a9cff3 sanity check bufcache before using it 1999-06-01 00:40:48 +00:00
thorpej e50ef977d1 Don't use a read lock on an intrsafe map; these maps can only use exclusive,
non-sleeping locks.
1999-05-28 19:40:09 +00:00
thorpej 2580d306ab Change the vm_map's "entries_pageable" member to a r/o flags member, which
has PAGEABLE and INTRSAFE flags.  PAGEABLE now really means "pageable",
not "allocate vm_map_entry's from non-static pool", so update all map
creations to reflect that.  INTRSAFE maps are maps that are used in
interrupt context (e.g. kmem_map, mb_map), and thus use the static
map entry pool (XXX as does kernel_map, for now).  This will eventually
change now these maps are locked, as well.
1999-05-26 19:16:28 +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
thorpej 497248ca55 XXX Pass VM_PROT_NONE to uvm_vslock() as access_type. Why are we even
vslocking here?!  copyout() on its own seems to suffice just about everwhere
else, and it's not like the process is going to exit; it's in a system
call!
1999-05-26 01:07:06 +00:00
tron bb5689beb3 Only attempt to remove symbol table from DDB's lists of symbol tables
if we really loaded one.
1999-05-25 00:16:08 +00:00
thorpej ba2bc023f7 Call the mdcallback immediately after computing bufpages; bufpages may
need to be clipped, and this needs to be done before computing nbuf.
1999-05-21 00:05:12 +00:00
thorpej 3aa41b1b36 Make this actually work if the BUFCACHE option is not specified, by falling
back on the traditional BSD formula of 10% of first 2MB and 5% of remaining.
1999-05-20 20:01:28 +00:00
lukem 091ffad669 MI implementation of allocsys() 1999-05-20 05:59:52 +00:00
lukem 03b1725220 rework format_bytes() into a more generic humanize_number().
implement the former with the latter.
1999-05-20 05:58:19 +00:00
sommerfeld 6c63af182f Delete test code. 1999-05-15 22:37:22 +00:00
sommerfeld c01c0d9453 Revise previous fix:
1) protect socket flags under splsoftnet()
	2) avoid leaking memory on an error
1999-05-15 22:36:34 +00:00
tv fc3f28c6bd Wow, that was much easier than I originally thought. Fix PR kern/7583:
serious race condition in sosend().  Upon closer inspection, the appropriate
flags are checked within splsoftnet() for soreceive(), so no change needed
there.  Also a little KNFing in sosend().
1999-05-15 16:42:48 +00:00
thorpej c10a926030 Allow the caller to specify a stack for the child process. If NULL,
the child inherits the stack pointer from the parent (traditional
behavior).  Like the signal stack, the stack area is secified as
a low address and a size; machine-dependent code accounts for stack
direction.

This is required for clone(2).
1999-05-13 21:58:32 +00:00
thorpej a6c810d72a Fix a (currently) harmless brian-o in last. 1999-05-13 17:28:30 +00:00
thorpej 5d97669cfe Allow an alternate exit signal (i.e. not SIGCHLD) to be delivered to the
parent, specified at fork time.  Specify a new flag to wait4(2), WALTSIG,
to wait for processes which use an alternate exit signal.

This is required for clone(2).
1999-05-13 00:59:03 +00:00
drochner 4a60ccd128 fix 2 problems with subregion allocation:
-a subregion start was ignored if all previous allocations were before
the subregion, reported by Lennart Augustsson in PR kern/7539
-an existing allocation which overlaps the beginning of the subregion
was ignored (ie overlapped) if is is not the last allocation
1999-05-11 11:02:54 +00:00
thorpej 6c37e2b392 Make sure page allocations are counted everywhere that they need to be. 1999-05-10 21:15:42 +00:00
thorpej 4b6d8943c2 Improve the pool allocator's diagnostic helpers, adding the ability to
log on a per-pool basis, reentrancy checking, and dumping various pool
information from DDB.
1999-05-10 21:13:05 +00:00
lukem 719cd63d24 Implement format_bytes(), which pretty prints a given u_int64_t into a
given buffer, and if necessary, reducing the display width of the
number to fit in the buffer by increasing the units (from kilobytes
(2^10) through to exabytes (2^60)).
1999-05-09 13:48:44 +00:00
tv 4c9c896cc8 FILE_UNUSE wasn't updated in the FDSCRIPTS block. 1999-05-07 17:38:41 +00:00
christos e649afd171 Add NTFS for the compat names. 1999-05-06 17:11:04 +00:00
thorpej e3669c3393 Add "use counting" to file entries. When closing a file, and it's reference
count is 0, wait for use count to drain before finishing the close.

This is necessary in order for multiple processes to safely share file
descriptor tables.
1999-05-05 20:01:01 +00:00
thorpej 4913e22a19 Fix alignment problem in the garbage-collection code path. 1999-05-05 19:05:43 +00:00
christos a32f7169fc Align struct timeval time to the same alignment requirements of a quad.
This broke the sparc elf kernel which in microtime uses ldd to load both
words at the same time. The a.out kernel, just got lucky.
1999-05-04 16:16:54 +00:00
sommerfe c0d15c5c7c Count lockmgr locks held by process if LOCKDEBUG || DIAGNOSTIC.
(previously, it was just under LOCKDEBUG).
1999-05-04 15:58:53 +00:00
cgd 1bce8c40fc ep_arglen is in units of 'sizeof (char *)', not in units of bytes. use
howmany(value, sizeof (char *)) to get the right value.
1999-04-30 23:02:06 +00:00
thorpej 645d5bd5f6 Share everything with proc0. 1999-04-30 21:40:30 +00:00
thorpej b699afcb5b Pay attention to FORK_SHARECWD, FORK_SHAREFILES, and FORK_SHARESIGS. 1999-04-30 21:39:51 +00:00
thorpej 2835fc6e46 Pull signal actions out of struct user, make them a separate proc
substructure, and allow them to be shared.

Required for clone(2).
1999-04-30 21:23:49 +00:00
thorpej 882d9195a3 Oops, forgot to commit this one. Free the cwdinfo on exit. 1999-04-30 20:54:04 +00:00
thorpej 16936c9565 Break cdir/rdir/cmask info out of struct filedesc, and put it in a new
substructure, `cwdinfo'.  Implement optional sharing of this substructure.

This is required for clone(2).
1999-04-30 18:42:58 +00:00
cgd ee94a4dacb add checks for COMPAT_OSF1 in the appropriate places 1999-04-30 05:29:20 +00:00
scottr 3d5c979e43 Pull in opt_poollog.h for POOL_LOGSIZE. 1999-04-29 17:47:19 +00:00
cgd e85db685e9 * don't have the [onz]magic setup functions set up the stack.
* add arguments describing the vnode and ecoff header of the executable
  being set up to the [onz]magic setup functions.
* export the stack setup function and the [onz]magic setup functions.
* call the MD ecoff hook _before_ the [onz]magic and stack setup
  functions, and bail out early if the MD hook sets up vmcmds.
1999-04-27 05:36:43 +00:00
cgd 5338149302 correct comment: turn off set-id if MNT_NOSUID is set, not MNT_NOEXEC. 1999-04-27 05:28:44 +00:00
thorpej 3d23eb3ce3 More improvements to mbuf and mbuf cluster allocation:
- Initialize mbpool and mclpool with msize and mclbytes, respectively,
so that those values may be patched and have an actual affect on the
next system reboot.

- Set low water marks on mbpool (default: 16) and mclpool (default: 8).
This should be of great help for diskless systems, which need to allocate
mbufs in order to clean dirty pages; the low water marks increase the
chances of this being possible to do in memory starvation situations.

- Add support for getting/setting some mbuf-related parameters via sysctl.
* msize and mclsize (read-only)
* nmbclusters (read-only unless the platform has direct-mapped pool pages,
in which case the value can be increased).
* mblowat and mcllowat (read/write)
1999-04-26 22:04:28 +00:00
thorpej 879070ef90 Add support for the kern.mbuf sysctl node. 1999-04-26 21:56:23 +00:00
is af3d525792 Fix adosfs's locking panic 1999-04-26 20:33:18 +00:00
simonb a560bdeeec Use the nmbclusters variable and not the NMBCLUSTERS constant when setting
the mclpool hardlimit.
1999-04-25 03:03:03 +00:00
simonb 5d8b1ef3e4 g/c REAL_CLISTS. 1999-04-25 02:56:26 +00:00
simonb 8ce41be7b0 Move inclusion of "opt_sb_max.h" from sys/socketvar.h to
conf/param.c, and move the initialisation of the sb_max
variable from kern/uipc_socket2.c to conf/param.c.  Now
everthing that includes sys/socketvar.h doesn't get
recompiled when SB_MAX's value changes.
1999-04-22 04:50:05 +00:00
mrg 48c12bfeed revert previous. oops. 1999-04-21 02:37:07 +00:00
mrg 58540a2274 properly test the msgsz as "msgsz - len". from PR#7386 1999-04-21 02:31:49 +00:00
gwr 9b055e8c43 minor nits -- replace vsprintf with vsnprinf 1999-04-12 00:24:17 +00:00
gwr 8946cf4be4 minor nits -- strncpy into p->p_comm 1999-04-12 00:22:08 +00:00
kleink bff1bef006 * Add a comment to ktrgetheader() mentioning that ktr_len and ktr_buf are
being left uninitialized intentionally; addresses PR kern/6987.
* In ktrsysret(), initialize the unused ktr_eosys to avoid writing random junk.
1999-04-11 18:44:00 +00:00
wrstuden 2e1fa90ecb Fix obscure bug in namei(), which was the cause of PR 7306.
The problem is that if "sl" is a symbolic link, a lookup on "sl/"
will be flagged as the last component. Thus VOP_LOOKUP will lock
the parent directory if LOCKPARENT is set. In order for the symbolic
link to be resolved, this lock needs to be released. namei() would
test for this by checking if ni_pathlen == 1, which it wouldn't as
"/" is left in the name, and namei() would not unlock the parent.
The next call to lookup() to resolve the symbolic link would fail
as the parent was still locked.
1999-04-07 05:47:37 +00:00
thorpej b2741be06e More locking protocol fixes. Protect pool_head with a spin lock (statically
initialized).  This lock also protects the "next drain candidate" pointer.

XXX There is still one locking protocol problem, which should not be
a problem in practice, but is still marked as an issue in the code anyhow.
1999-04-06 23:32:44 +00:00
sommerfe c97bb0650d Fix compile warning (not seen with egcs, but...) 1999-04-05 03:33:31 +00:00
chs c109816333 Undo the part of the last revision about pr_rmpage() referencing
a data structure after it was freed.  This wasn't actually a problem,
and the change caused the wrong pool_item_header to be freed
in the non-PR_PHINPAGE case.
1999-04-04 17:17:31 +00:00
thorpej 4fd2edfbe8 mbinit() can now allocate memory. Update a comment accordingly. 1999-04-01 00:23:25 +00:00
thorpej c431ebc42f Call cpu_startup() immediately after uvm_init(), but before mbinit().
Call configure() directly immediately after config_init().

This causes autoconfiguration to happen at the same time as before, but
creates some kernel submaps earlier, so that e.g. mbinit() can now
allocate memory.
1999-04-01 00:22:45 +00:00
thorpej 278e7ae222 Yet more fixes to the pool allocator:
- Protect userspace from unnecessary header inclusions (as noted on
current-users).

- Some const poisioning.

- GREATLY simplify the locking protocol, and fix potential deadlock
scenarios.  In particular, assume that the back-end page allocator
provides its own locking mechanism (this is currently true for all
such allocators in the NetBSD kernel).  Doing so allows us to simply
use one spin lock for serialized access to all r/w members of the pool
descriptor.  The spin lock is released before calling the back-end
allocator, and re-acquired upon return from it.

- Fix a problem in pr_rmpage() where a data structure was referenced
after it was freed.

- Minor tweak to page manaement.  Migrate both idle and empty pages
to the end of the page list.  As soon as a page becomes un-empty
(by a pool_put()), place it at the head of the page list, and set
curpage to point to it.  This reduces fragmentation as well as the
time required to find a non-empty page as soon as curpage becomes
empty again.

- Use mono_time throughout, and protect access to it w/ splclock().

- In pool_reclaim(), if freeing an idle page would reduce the number
of allocatable items to below the low water mark, don't.
1999-03-31 23:23:47 +00:00
mycroft f145c291bd If copyout() fails, make sure to unbusy the mount point before returning. 1999-03-31 19:18:45 +00:00
mycroft 0622545249 Previous change to vn_lock() was bogus. If we got EDEADLK, it was from
lockmgr(), and it already unlocked v_interlock.  So, just return in this case.
1999-03-31 18:30:13 +00:00
thorpej 98d006d2c6 Set a hard limit (rather than an advisory high water mark for pages) of
NMBCLUSTERS for the mbuf cluster pool.  On platforms which use direct-mapped
segments for pool pages (MIPS and Alpha), this makes NMBCLUSTERS actually
meaningful (such ports don't even allocate mb_map, as it is not used to
map mbuf cluster pages).

Improve the message logged at a maximum rate of once per second.  The
new message: "WARNING: mclpool limit reached; increase NMBCLUSTERS".

In the back-end pool page allocator, remove the message about mb_map
being full.  The message was not necessarily correct as the allocator
may have been starved for pages, rather than for space in the map.  Also,
the hard limit on the mbuf cluster pool will be reached before the map
fills (the last cluster will always fit into the map), so the message
is redundant.

Add a comment in mbinit() about considering setting low water marks on
the mbuf and mbuf cluster pools.
1999-03-31 01:26:40 +00:00
thorpej d4d4e314e9 Fix several bugs/deficiencies in the pool allocator:
- Add support for hard limits, with optional rate-limited logging of
a warning message when the pool limit is reached.  (This will be used
to fix a bug in mbuf cluster allocation on the MIPS and Alpha ports.)

- Fix some locking protocol errors.  This required splitting pr_flags
into pr_flags (which is protected by the spin lock) and pr_roflags (which
are `read only' flags, set when the pool is initialized, and never changed
again; these do not need to be protected by a mutex).

- Make the low water support actually mean something.  When a low water
mark is set, add free items to the pool until the low water mark is
reached.  When an item allocation causes the number of free items to
drop below the low water mark, make the pool catch up to it.  This can
make the pool allocator more useful for several applications (e.g.
pmap `pv entry' management) and more robust for others (for e.g. mbuf
and mbuf cluster allocation, so that the pagedaemon can use NFS to clean
pages on diskless systems without completely running dry on buffers to
receive packets in during extreme memory shoratages).

- Add a comment where we sleep waiting for more pages for the back-end
page allocator.  Specifically, instead of sleeping potentially forever,
perhaps we should just wake up once a second to try allocating a page
again.  XXX Revisit this soon.
1999-03-31 01:14:06 +00:00
wrstuden bd2d8363bc The mode for a node is a mode_t in both struct stat and struct vattr -
don't use a u_short for intermediate storage in vn_stat.
1999-03-30 00:16:44 +00:00
kleink 2304549e9f Sync __getlogin()'s namelen argument with the libc-internal declaration
(u_int vs. size_t).
1999-03-28 17:34:33 +00:00
kleink 1c35ac8f6b Regen. 1999-03-28 17:32:51 +00:00
kleink 38c7f65f0c Sync __getlogin()'s namelen argument with the libc-internal declaration
(u_int vs. size_t).
1999-03-28 17:29:52 +00:00
eeh 69d1f9d0d3 COMPAT_SPARC32 -> COMPAT_NETBSD32 1999-03-26 04:29:20 +00:00
thorpej c647f127c1 Assign initproc in main(), not start_init(). It's conventient to do so. 1999-03-26 01:10:50 +00:00
sommerfe ef07055d58 Disallow tracing of processes unless tracer's root directory is at or
above tracee's root directory.
1999-03-25 04:45:56 +00:00
nathanw e8b935d003 Garbage collect a non-useful variable in getcwd_scandir(). 1999-03-25 02:32:18 +00:00
sommerfe f1a508e354 Prevent deadlock cited in PR4629 from crashing the system. (copyout
and system call now just return EFAULT).  A complete fix will
presumably have to wait for UBC and/or for vnode locking protocols to
be revamped to allow use of shared locks.
1999-03-25 00:20:35 +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
lukem 8a931fcdd8 Ensure that you can only bind a more specific address when it is done by the
same uid or by root.

This code is from FreeBSD. (Whilst it was originally obtained from OpenBSD,
FreeBSD fixed it to work with multicast. To quote the commit message:
    - Don't bother checking for conflicting sockets if we're binding to a
      multicast address.
    - Don't return an error if we're binding to INADDR_ANY, the conflicting
      socket is bound to INADDR_ANY, and the conflicting socket has
      SO_REUSEPORT set.
)
1999-03-23 10:45:37 +00:00
thorpej 845b609f97 Set the high water mark on the mbuf cluster pool to NMBCLUSTERS. 1999-03-23 02:51:27 +00:00
thorpej 9614a68c70 Fix the order of arguments to roundup(). 1999-03-23 02:49:03 +00:00
thorpej f2a91c9b91 Put back the code to log `mb_map full' that was lost when mbuf clusters
were converted to use the pool allocator.
1999-03-22 22:06:58 +00:00
sommerfe 098b6f8e8a Disallow descriptor-passing of descriptors which are open on
directories which aren't under the recipient's root.

Clean up of many error conditions involving descriptor passing, to
eliminate infinite loops, panics, premature garbage collection of
sockets, and descriptor leaks:
 - Avoid letting unp_gc() see descriptors with a refcount of zero by
removing them from the socket's queue before releasing them.
 - Avoid socket leak in PRU_ABORT (this will also gc descriptors queued
on a not-yet accepted socket when the accepting socket goes away).
 - Put in block comment explaining how unp_gc() should work.
 - Correctly manage unp_defer count so we don't get stuck in an infinite
loop with nothing to do.
 - Don't tie MARK and DEFER bits so closely together.
 - Mark descriptors queued on not-yet-accepted sockets as well.
 - Don't call sorflush on non-socket, it doesn't work very well.
 - Deal with discard of NULL file pointer.
 - Hopefully cause GC to converge faster by only deferring sockets in
unp_mark().
1999-03-22 17:54:38 +00:00
sommerfe 2f0f84b8e8 bug fix to fdavail: be consistent about taking per-process descriptor
limit into account when checking against the limit; fdp->fd_nfiles may
be greater than the current descriptor limit, and there may be space
in fdp->fd_ofiles beyond the limit.  If we say it's available,
unp_externalize will get confused and panic when fdalloc fails.
1999-03-22 17:39:44 +00:00
sommerfe 36dc99adac vinvalbuf, called from vclean, could cause a locking-against-self
deadlock in VOP_FSYNC() if the unreferenced vnode picked for
reclamation happened to be stacked on top of a vnode the process
already had locked.  This could happen if the same filesystem was
accessed both through a union mount and directly; it seemed to happen
most frequently when the direct access was through NFS.

Avoid this deadlock by changing vinvalbuf to pass a new FSYNC_RECLAIM
flag bit to VOP_FSYNC() to indicate that a reclaim is in progress and
only a `shallow' fsync is necessary.

Do nothing in *_fsync() in umapfs, nullfs, and unionfs when
FSYNC_RECLAIM is set; the underlying vnodes will shortly be released
in *_reclaim and may be reclaimed (and fsync'ed) later.
1999-03-22 17:24:19 +00:00
sommerfe 6d0f67d6aa Regen files based on changes to syscalls.master, vnode_if.src (latter
was changes to comments only, but..)
Build vfs_getcwd.c as standard part of kernel.
Add implementation of fchroot(), since two emulations already had it.
Call vn_isunder() in fchdir(), chroot(), and fchroot() to make it harder
to escape chroot().
1999-03-22 17:13:34 +00:00
sommerfe 095cd96cd5 Change namei cache to record vnode->(parent,name) entries (for directories).
Add kernel implementation of getcwd() which uses this cache, falling
back to reading the filesystem on a cache miss.
Along for the ride: add new VOP_FSYNC flag FSYNC_RECLAIM indicating
that a reclaim is being done, so only a "shallow" fsync is needed.
1999-03-22 17:01:55 +00:00
sommerfe 75fb6d661f Include some comments with more details on the VOP_LOOKUP locking protocol 1999-03-22 16:57:37 +00:00
bouyer 87662a89a2 Hinherit MNT_NOEXEC from the mount point. Without this a user can exec
arbitrary binaries by doing a user mount, even if the admin has carefully
setup his system to avoid arbitrary binaries execution.
1999-03-17 15:35:03 +00:00
kleink 51be278873 Defopt COMPAT_M68K4K. 1999-03-09 21:02:38 +00:00
mycroft f3df26f6f3 This is sort of gratuitous, but...
Strip the leading path off of init's argv[0].
1999-03-05 07:26:21 +00:00
fvdl 31289a4af8 Fill in vnodecovered in the mount structure before calling VFS_MOUNT anyway,
some things (e.g. unionfs) may depend on it. It's currently ok
for vnodecovered to be set already; it's not for v_mountedhere in
the vnode, though.

From John Darrow.

XXX should probably just extend VFS_MOUNT to take the vnode pointer as
an argument.
1999-03-02 07:47:49 +00:00
ross e47e3c9f45 schedclk() -> schedclock(), for consistency with hardclock(), statclock(), ...
update comments for recent scheduler mods
1999-02-28 18:14:57 +00:00
fvdl c0fb2ab4f2 Use a SETRECURSE lock before calling VFS_MOUNT in the mount() system call,
since the lock may be taken again. This was the intention of the CANRECURSE
lock already there, but didn't work.

Only fill in the vnode<->mountpoint links (mountedhere and vnodecovered)
after VFS_MOUNT returned succesfully. It might happen that something called
from VFS_MOUNT mistook the vnode for an already successfully mounted on
one because of this.
1999-02-28 14:12:54 +00:00
fvdl 080ad305ff Recursive locks were previously only available with LK_CANRECURSE. This
could be done in one of 2 ways:

	* call lk_init with LK_CANRECURSE, resulting in a lock that
 	  always can be used recursively.
	* call lockmgr with LK_CANRECURSE, meaning that it's ok if this
	  lock is already held by us.

Sometimes we need a locking type that says: take this lock now, exclusively,
but while I am holding it, I may go through a code path which could attempt
to get the lock again, and which is unaware that the lock might already
be taken.  Implement LK_SETRECURSE for this purpose. Assume that locks and
unlocks come in matching pairs (they should), and check for this 'level'
using SETRECURSE locks.
1999-02-28 14:09:15 +00:00
wrstuden 0078fc50dc Modify VOP_CLOSE vnode op to always take a locked vnode. Change vn_close
to pass down a locked node. Modify union_copyup() to call VOP_CLOSE
locked nodes.

Also fix a bug in union_copyup() where a lock on the lower vnode would
only be released if VOP_OPEN didn't fail.
1999-02-26 23:38:55 +00:00
christos 88162a0fe9 Make this compile without EXEC_AOUT and with COMPAT_FREEBSD 1999-02-23 18:19:29 +00:00
mycroft d4955ba8a9 While I'm on a fixed point kick, improve the NTP clock factor correction to
give <.1% error in all (supported) cases.  It doesn't cost us much.
1999-02-23 17:41:48 +00:00
ross 6803dbddbb Replace the recent scheduler mods with calls to scheduler_{fork,wait}_hook(),
(inlined) so scheduler functionality can be kept in a single .h/.c set.
Also, the wait hook has changed the way it clips the scheduler history.
1999-02-23 02:57:18 +00:00
ross b4a33c4e60 Scheduler bug fixes and reorganization
* fix the ancient nice(1) bug, where nice +20 processes incorrectly
  steal 10 - 20% of the CPU, (or even more depending on load average)
* provide a new schedclk() mechanism at a new clock at schedhz, so high
  platform hz values don't cause nice +0 processes to look like they are
  niced
* change the algorithm slightly, and reorganize the code a lot
* fix percent-CPU calculation bugs, and eliminate some no-op code

=== nice bug === Correctly divide the scheduler queues between niced and
compute-bound processes. The current nice weight of two (sort of, see
`algorithm change' below) neatly divides the USRPRI queues in half; this
should have been used to clip p_estcpu, instead of UCHAR_MAX.  Besides
being the wrong amount, clipping an unsigned char to UCHAR_MAX is a no-op,
and it was done after decay_cpu() which can only _reduce_ the value.  It
has to be kept <= NICE_WEIGHT * PRIO_MAX - PPQ or processes can
scheduler-penalize themselves onto the same queue as nice +20 processes.
(Or even a higher one.)

=== New schedclk() mechansism === Some platforms should be cutting down
stathz before hitting the scheduler, since the scheduler algorithm only
works right in the vicinity of 64 Hz. Rather than prescale hz, then scale
back and forth by 4 every time p_estcpu is touched (each occurance an
abstraction violation), use p_estcpu without scaling and require schedhz
to be generated directly at the right frequency. Use a default stathz (well,
actually, profhz) / 4, so nothing changes unless a platform defines schedhz
and a new clock.  Define these for alpha, where hz==1024, and nice was
totally broke.

=== Algorithm change === The nice value used to be added to the
exponentially-decayed scheduler history value p_estcpu, in _addition_ to
be incorporated directly (with greater wieght) into the priority calculation.
At first glance, it appears to be a pointless increase of 1/8 the nice
effect (pri = p_estcpu/4 + nice*2), but it's actually at least 3x that
because it will ramp up linearly but be decayed only exponentially, thus
converging to an additional .75 nice for a loadaverage of one. I killed
this, it makes the behavior hard to control, almost impossible to analyze,
and the effect (~~nothing at for the first second, then somewhat increased
niceness after three seconds or more, depending on load average) pointless.

=== Other bugs === hz -> profhz in the p_pctcpu = f(p_cpticks) calcuation.
Collect scheduler functionality. Try to put each abstraction in just one
place.
1999-02-23 02:56:03 +00:00
drochner 220b8d9add PR kern/7033 (Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>): use
device minor to unit/partition macros from sys/disklabel.h
1999-02-22 16:00:01 +00:00
cjs d390501801 Safer use of printf. 1999-02-22 00:12:36 +00:00
mycroft bb815bda9e Fix a thinko in the previous.
Also:
* Do the boundary check when creating a new region as well.
* If we crossed the boundary, don't just throw away the region; lop off the
  beginning and see if we still fit.
SB16 is now fully functional on the Alpha.
1999-02-18 18:52:29 +00:00
mycroft ca00239fe9 Speed up the calculation of dontcross; use EXTENT_ALIGN to calculate it
directly rather than using a loop.  Also adjust so that we can allocate at
the end of the integer range.
1999-02-18 18:13:50 +00:00
christos 1aede0624c Now that shell has been fixed so that ". filename" does not look at . if .
is not in the path add ./ to the files.
1999-02-17 18:17:10 +00:00
christos ac66b8f92d Don't forget to lower the spl in the error case of sigprocmask 1999-02-13 15:25:51 +00:00
veego 8b48b6c4af Protect the COMM variable with an '.ifmake tags' to stop the long delay
while doing a make in src/sys/arch/* on slow machines.
1999-02-12 19:52:30 +00:00