Commit Graph

6272 Commits

Author SHA1 Message Date
Daniel Eischen
1328e1c4be Add an argument to get_mcontext() which specified whether the
syscall return values should be cleared.  The system calls
getcontext() and swapcontext() want to return 0 on success
but these contexts can be switched to at a later time so
the return values need to be cleared in the saved register
sets.  Other callers of get_mcontext() would normally want
the context without clearing the return values.

Remove the i386-specific context saving from the KSE code.
get_mcontext() is not i386-specific any more.

Fix a bad pointer in the alpha get_mcontext() code.  The
context was being bcopy()'d from &td->tf_frame, but tf_frame
is itself a pointer, so the thread was being copied instead.
Spotted by jake.

Glanced at by:  jake
Reviewed by:    bde (months ago)
2003-04-25 01:50:30 +00:00
Tim J. Robbins
913fc94d2b Include altkstack pages in the RSS regardless of whether the process
is swapped out. Pointed out by jhb.
2003-04-25 00:20:40 +00:00
Dag-Erling Smørgrav
013466aa50 It seems that 1 was not a magic value as I thought, but a coincidence.
Instead of applying the adjustment to processes with a start time of 1,
apply it to all processes with a start time of less than 3600.

None of this would be necessary if the start times were recorded in ticks
instead of seconds and microseconds.
2003-04-24 12:12:06 +00:00
Tim J. Robbins
ceff7f2a48 Do a better job of calculating the RSS for swapped-out processes:
don't include the kernel stacks of swapped-out threads in the page count,
but do include the alternate kernel stack. jhb provided some helpful
comments on this.

PR:		49102
2003-04-24 11:03:04 +00:00
Tim J. Robbins
38dd7dee8a Free mount credentials (mnt_cred) when freeing the mount struct
in failure cases to avoid leaking struct ucreds, and ultimately
leaking struct uidinfo references.
2003-04-24 08:16:06 +00:00
Alan Cox
b6e48e0372 - Acquire the vm_object's lock when performing vm_object_page_clean().
- Add a parameter to vm_pageout_flush() that tells vm_pageout_flush()
   whether its caller has locked the vm_object.  (This is a temporary
   measure to bootstrap vm_object locking.)
2003-04-24 04:31:25 +00:00
Dag-Erling Smørgrav
1f7440d9f6 When filling out a kinfo_proc structure, if we come across a process
whose p_stats->p_start has the magic value 1, replace it with boottime.
Some users were apparently confused by the fact that ps(1) reported a
start time in early 1970 for system processes.
2003-04-24 03:37:59 +00:00
John Baldwin
cf60731b01 Remove Giant from osigblock(), osigsetmask(), and kern_sigaltstack(). 2003-04-23 19:49:18 +00:00
John Baldwin
5eac9e2dcb The signotify() sanity check in userret() doesn't need Giant anymore. 2003-04-23 18:51:55 +00:00
John Baldwin
2056d0a168 Add lock assertions for various proc/thread/kse/ksegroup fields to the
scheduler functions.
2003-04-23 18:51:05 +00:00
John Baldwin
5afe0c9947 - Reorganize osigstack() to do the copyin first, grab the proc lock once,
do all the various sigstack dances, unlock the proc lock, and finally do
  the copyout.  This more closely resembles the behavior of
  kern_sigaltstack() and closes a small race.
- Remove Giant from osigstack as it is no longer needed.
2003-04-23 18:50:25 +00:00
John Baldwin
4d923fe3f5 Remove Giant from [gs]etpriority(). 2003-04-23 18:48:55 +00:00
John Baldwin
112afcb232 - Protect p_numthreads with the sched_lock.
- Protect p_singlethread with both the sched_lock and the proc lock.
- Protect p_suspcount with the proc lock.
2003-04-23 18:46:51 +00:00
David E. O'Brien
2603007ace Add /dev to the Alpha manual mount root example. 2003-04-23 05:02:40 +00:00
John Baldwin
9752f794c7 - Move PS_PROFIL and its new cousin PS_STOPPROF back over to p_flag and
rename them appropriately.  Protect both flags with both the proc lock
  and the sched_lock.
- Protect p_profthreads with the proc lock.
- Remove Giant from profil(2).
2003-04-22 20:54:04 +00:00
John Baldwin
0b5318c81a - Assert that the proc lock and sched_lock are held in sched_nice().
- For the 4BSD scheduler, this means that all callers of the static
  function resetpriority() now always hold sched_lock, so don't lock
  sched_lock explicitly in that function.
2003-04-22 20:50:38 +00:00
John Baldwin
a15cc35909 Lock both the proc lock and sched_lock when calling sched_nice since
kg_nice is now protected by both.  Being protected by both means that
other places in the kernel that want to read kg_nice only need one of the
two locks.
2003-04-22 20:45:38 +00:00
John Baldwin
eeec6bab2e Prefer the proc lock to sched_lock when testing PS_INMEM now that it is
safe to do so.
2003-04-22 20:01:56 +00:00
John Baldwin
828e7683bf Protect p_swtime with the sched_lock. 2003-04-22 19:48:25 +00:00
John Baldwin
a6f37ac9d6 - Mark the kse_purge_group() and kse_purge() definitions static to match
their prototypes.
- Remove sched_lock locking from kse_purge() as all callers already lock
  the sched_lock before calling it.
- Hold the proc lock slightly longer to protect P_SHOULDSTOP().
2003-04-22 19:47:55 +00:00
Warner Losh
01a9b4348f Create a new function, device_is_attached(), that is like
device_is_alive() that tells us if the device has successfully
attached.  device_is_alive just tells us that the device has
successfully probed.
2003-04-21 18:19:08 +00:00
David Xu
11b20c685b Fix lock order reversal problem. 2003-04-21 14:42:04 +00:00
David Xu
1ecb38a365 Introduce two flags to control upcall behaviour:
o KMF_NOUPCALL
	Ask kse_release to not return to userland upcall entry, but instead
	direct returns to userland by using current thread's stack and return
	address on stack. This flags is intended to be used by UTS in critical
	region to wait another UTS thread to leave critical region, by using
	kse_release with this flag to avoid spinnng and burning CPU. Also this
	flags can be used by UTS to poll completed context when there is nothing
	to do in userland and needn't restart from its entry like normal upcall.

o KMF_NOCOMPLETED
	Ask kernel to not bring completed thread contexts back to userland when
	doing upcall, this flags is intend to be used with above flag when an
	upcall thread is in critical region and can not process completed contexts
	at that time.

Tested by: deischen
2003-04-21 07:27:59 +00:00
Warner Losh
e22b0bf4b8 Fix /dev/devctl's implementation of poll. We should only be setting
the poll bits when there's actually something in the queue.
Otherwise, select always returned '2' when there were no items to be
read, and '3' when there were.  This would preclude being able to read
in a threaded (libc_r) program, as well as checking to see if there
were pending events or not.
2003-04-21 05:58:51 +00:00
Alan Cox
2b7e071e89 - Lock the vm_object when performing vm_object_pip_add(). 2003-04-20 07:29:50 +00:00
Alan Cox
097d4338db Lock the vm_object in vfs_busy_pages(). 2003-04-20 00:17:05 +00:00
Alan Cox
0fa05eae77 - Lock the vm_object when performing vm_object_pip_subtract().
- Assert that the vm_object lock is held in vm_object_pip_subtract().
2003-04-19 22:11:41 +00:00
Alan Cox
0d420ad3e6 - Lock the vm_object when performing vm_object_pip_wakeupn().
- Assert that the vm_object lock is held in vm_object_pip_wakeupn().
 - Add a new macro VM_OBJECT_LOCK_ASSERT().
2003-04-19 21:15:44 +00:00
Alan Cox
ea08145b76 Lock the jumbo_vm_object when performing vm_page_alloc(). 2003-04-19 19:13:25 +00:00
David Xu
95bee4c365 Test next upcall time correctly. 2003-04-19 06:16:04 +00:00
David Xu
06ce69a720 Unbreak sigaltstack syscall. sigonstack is now a function and
want proc lock be held.
2003-04-19 05:04:06 +00:00
David Xu
588257e810 Use correct thread pointer. 2003-04-19 04:39:10 +00:00
John Baldwin
8b94a0616d - Make sigonstack() a regular function instead of an inline and add a proc
lock assertion to it.
- SIGPENDING() no longer needs sched_lock, so only grab sched_lock to set
  the TDF_NEEDSIGCHK and TDF_ASTPENDING flags in signotify().
- Add a proc lock assertion to tdsigwakeup().
- Since we always set TDF_OLDMASK while holding the proc lock, the proc
  lock is sufficient protection to check its state in postsig() and we only
  need sched_lock when clearing the actual flag.
2003-04-18 20:59:05 +00:00
John Baldwin
889a6b5845 Use the proc lock to protect p_singlethread and a P_WEXIT test. This
fixes a couple of potential KSE panics on non-i386 arch's that weren't
holding the proc lock when calling thread_exit().
2003-04-18 20:20:00 +00:00
John Baldwin
e77daab1af Rename do_sigprocmask() to kern_sigprocmask() and make it a global symbol
so that it can be used by binary emulators.
2003-04-18 20:18:44 +00:00
John Baldwin
08865ba1d1 Add a couple of sched_lock asserts. 2003-04-18 20:17:47 +00:00
John Baldwin
02e878d97c - Add a static function pgadjustjobc() to adjust the job control count for
a process group.
- Call pgadjustjobc() twice in fixjobc() to avoid code duplication and
  improve readability.
- Use the proc lock to protect P_SHOULDSTOP() instead of sched_lock.
- Check to see if a process is PRS_NEW with sched_lock before trying to
  lock its proc lock since the lock may not be constructed yet.
2003-04-18 20:17:05 +00:00
Robert Watson
2d3db0b823 Update NAI copyright to 2003, missed in earlier commits and merges. 2003-04-18 19:57:37 +00:00
Alan Cox
49281fbf68 Update locking around vm_object_page_remove() to use the new macros. 2003-04-18 16:39:03 +00:00
Jeff Roberson
7cd650a972 - Set the ke_cpu field in sched_add() for interrupt and realtime threads
since they are going on the current cpu and not their previously assigned
   cpu.
 - sched_runnable() should only return true in the SMP case if the other
   processor has more than one thread that is runnable.  We can not steal
   curthread.
 - Change kseq_print() to accept the cpuid instead of a kseq pointer.  This
   makes use of this function in ddb much easier.
2003-04-18 05:24:10 +00:00
Julian Elischer
d3a0bd78a8 Add a thread_unlink() and use it.
It could also be used twice in kern_thr.c but that's owned by jeff
so I'l let him change it when he's next there.
2003-04-18 00:16:13 +00:00
John Baldwin
cd4ed3b5b0 - kthread's don't have p_textvp set to anything, so replace code that
dealt with that possibility with a KASSERT().
- No need to set P_SYSTEM, kthread_create() does that for us.
2003-04-17 22:37:48 +00:00
John Baldwin
213b19e9fb - Use a local struct proc variable to improve readability.
- Use a local variable to close a minor race when determining if the wmesg
    printed out needs a prefix such as when a thread is blocked on a lock.
2003-04-17 22:36:40 +00:00
John Baldwin
f5d5cb3c7c Tweak locking in the PS_XCPU handler to hold the sched_lock while reading
p_runtime.
2003-04-17 22:33:04 +00:00
John Baldwin
b68e08498f The sched_lock is not needed while clearing two of the P_STOPPED bits in
p_flag.  Also, the proc lock can't be recursed, so simplify an older proc
lock assertion.
2003-04-17 22:31:54 +00:00
John Baldwin
b5a2bad175 Don't assume that p_session hasn't changed out from under us after unlocking
the process and session.  Instead, cache a true reference to the session
when we do the hold and release our reference on that session.  This avoids
the need for the proc lock when dropping the reference.
2003-04-17 22:30:43 +00:00
John Baldwin
f385f7156a Lock the sched_lock while setting TDF_INPANIC. 2003-04-17 22:29:23 +00:00
John Baldwin
27dad03c97 Use TD_IS_RUNNING() instead of thread_running() in the adaptive mutex
code.
2003-04-17 22:28:58 +00:00
John Baldwin
0bfc4d1445 fork1() already sets PS_INMEM, so don't set it again. This lets us push
sched_lock down slightly so that it isn't needed in the RFSTOPPED case.
2003-04-17 22:28:28 +00:00
John Baldwin
69c4ee54ff - The prison mutex cannot possibly protect pointers to the prison it
protects, so don't bother locking it while we assign it to a ucred's
  cr_prison.
- Fully construct the new credential for a process before assigning it to
  p_ucred.
2003-04-17 22:26:53 +00:00