Commit Graph

136 Commits

Author SHA1 Message Date
Julian Elischer
60f798c1c8 Fix rtprio() to do sensible things when called from threaded processes.
It's not quite correct from a posix Point Of view, but it is a lot better
than what was there before. This will be revisited later
when we decide what form our priority extensions will take. Posix doesn't
specify  how a system scope thread can change its priority so you need to
add non-standard extensions to be able to do it..
For now make this slightly non standard to allow it to be done.

Submitted by:	Dan Eischen originally, changed by myself.
2004-05-08 08:56:05 +00:00
Maxime Henrion
4ddd1e65d4 Remove a comment that complains about the lack of %qd, to justify
truncating a rlim_t to a long.  We have %qd since some time now.
However, the correct format to use here is %jd and a cast to
intmax_t, so do this.
2004-04-10 11:08:16 +00:00
Warner Losh
7f8a436ff2 Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core
2004-04-05 21:03:37 +00:00
John Baldwin
e7a44cace2 Argh! Fix a bogon. lim_cur() was returning the hard (max) limit rather
than the soft (cur) limit.

Submitted by:	bde
2004-02-11 18:04:13 +00:00
John Baldwin
a875f38546 - Convert the plimit lock to a pool mutex lock.
- Hide struct plimit from userland.

Submitted by:	bde (2)
2004-02-06 19:35:14 +00:00
John Baldwin
f4daf05619 - Correct the translation of old rlimit values to properly handle the old
RLIM_INFINITY case for ogetrlimit().
- Use %jd and intmax_t to output negative time in usec in calcru().
- Rework getrusage() to make a copy of the rusage struct into a local
  variable while holding Giant and then do the copyout from the local
  variable to avoid having to have the original process rusage struct
  locked while doing the copyout (which would not be safe).  This also
  includes a few style fixes from Bruce to getrusage().

Submitted by:	bde (1, parts of 3)
Suggested by:	bde (2)
2004-02-06 19:30:12 +00:00
John Baldwin
99b6e02ba6 A few more style fixes from Bruce including a few I missed last time.
Submitted by:	bde
2004-02-06 19:25:34 +00:00
John Baldwin
b4323d7729 - A lot of style and whitespace fixes.
- Update a few comments regarding locking notes.

Submitted by:	bde (1, mostly)
2004-02-05 20:53:25 +00:00
John Baldwin
91d5354a2c Locking for the per-process resource limits structure.
- struct plimit includes a mutex to protect a reference count.  The plimit
  structure is treated similarly to struct ucred in that is is always copy
  on write, so having a reference to a structure is sufficient to read from
  it without needing a further lock.
- The proc lock protects the p_limit pointer and must be held while reading
  limits from a process to keep the limit structure from changing out from
  under you while reading from it.
- Various global limits that are ints are not protected by a lock since
  int writes are atomic on all the archs we support and thus a lock
  wouldn't buy us anything.
- All accesses to individual resource limits from a process are abstracted
  behind a simple lim_rlimit(), lim_max(), and lim_cur() API that return
  either an rlimit, or the current or max individual limit of the specified
  resource from a process.
- dosetrlimit() was renamed to kern_setrlimit() to match existing style of
  other similar syscall helper functions.
- The alpha OSF/1 compat layer no longer calls getrlimit() and setrlimit()
  (it didn't used the stackgap when it should have) but uses lim_rlimit()
  and kern_setrlimit() instead.
- The svr4 compat no longer uses the stackgap for resource limits calls,
  but uses lim_rlimit() and kern_setrlimit() instead.
- The ibcs2 compat no longer uses the stackgap for resource limits.  It
  also no longer uses the stackgap for accessing sysctl's for the
  ibcs2_sysconf() syscall but uses kernel_sysctl() instead.  As a result,
  ibcs2_sysconf() no longer needs Giant.
- The p_rlimit macro no longer exists.

Submitted by:	mtm (mostly, I only did a few cleanups and catchups)
Tested on:	i386
Compiled on:	alpha, amd64
2004-02-04 21:52:57 +00:00
Jeff Roberson
eab9cabf34 - Don't set td_priority directly here, use sched_prio(). 2003-10-27 07:15:47 +00:00
Don Lewis
857d9c60d0 Extend the mutex pool implementation to permit the creation and use of
multiple mutex pools with different options and sizes.  Mutex pools can
be created with either the default sleep mutexes or with spin mutexes.
A dynamically created mutex pool can now be destroyed if it is no longer
needed.

Create two pools by default, one that matches the existing pool that
uses the MTX_NOWITNESS option that should be used for building higher
level locks, and a new pool with witness checking enabled.

Modify the users of the existing mutex pool to use the appropriate pool
in the new implementation.

Reviewed by:	jhb
2003-07-13 01:22:21 +00:00
David E. O'Brien
677b542ea2 Use __FBSDID(). 2003-06-11 00:56:59 +00:00
John Baldwin
4d923fe3f5 Remove Giant from [gs]etpriority(). 2003-04-23 18:48:55 +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
08865ba1d1 Add a couple of sched_lock asserts. 2003-04-18 20:17:47 +00:00
Jeff Roberson
f6f230febe - Adjust sched hooks for fork and exec to take processes as arguments instead
of ksegs since they primarily operation on processes.
 - KSEs take ticks so pass the kse through sched_clock().
 - Add a sched_class() routine that adjusts a ksegrp pri class.
 - Define a sched_fork_{kse,thread,ksegrp} and sched_exit_{kse,thread,ksegrp}
   that will be used to tell the scheduler about new instances of these
   structures within the same process.  These will be used by THR and KSE.
 - Change sched_4bsd to reflect this API update.
2003-04-11 03:39:07 +00:00
Tim J. Robbins
262c27b846 Back out previous. The locking here needs a rethink. 2003-03-13 00:54:53 +00:00
Tim J. Robbins
a7cbe87a5e Acquire sched_lock around use of FOREACH_KSEGRP_IN_PROC, accesses
to kg_nice and calls to sched_nice() in getpriority() and setpriority()
(really donice()).
2003-03-12 11:24:41 +00:00
Tim J. Robbins
27e39ae4d8 Remove the PL_SHAREMOD flag from struct plimit, which could have been
used to share resource limits between rfork threads, but never was.
Removing it makes resource limit locking much simpler -- only the current
process can change the contents of the structure that p_limit points to.
2003-02-20 04:18:42 +00:00
Warner Losh
a163d034fa Back out M_* changes, per decision of the TRB.
Approved by: trb
2003-02-19 05:47:46 +00:00
Jeff Roberson
e4625663c9 - Move ke_sticks, ke_iticks, ke_uticks, ke_uu, ke_su, and ke_iu back into
the proc.  These counters are only examined through calcru.

Submitted by:	davidxu
Tested on:	x86, alpha, UP/SMP
2003-02-17 02:19:58 +00:00
Tim J. Robbins
5ce623b8e0 Add an XXX comment noting that getrusage() accesses p_stats->p_ru
and p_stats->p_cru without holding the appropriate locks.
2003-02-13 09:53:59 +00:00
Julian Elischer
6f8132a867 Reversion of commit by Davidxu plus fixes since applied.
I'm not convinced there is anything major wrong with the patch but
them's the rules..

I am using my "David's mentor" hat to revert this as he's
offline for a while.
2003-02-01 12:17:09 +00:00
David Xu
0dbb100b9b Move UPCALL related data structure out of kse, introduce a new
data structure called kse_upcall to manage UPCALL. All KSE binding
and loaning code are gone.

A thread owns an upcall can collect all completed syscall contexts in
its ksegrp, turn itself into UPCALL mode, and takes those contexts back
to userland. Any thread without upcall structure has to export their
contexts and exit at user boundary.

Any thread running in user mode owns an upcall structure, when it enters
kernel, if the kse mailbox's current thread pointer is not NULL, then
when the thread is blocked in kernel, a new UPCALL thread is created and
the upcall structure is transfered to the new UPCALL thread. if the kse
mailbox's current thread pointer is NULL, then when a thread is blocked
in kernel, no UPCALL thread will be created.

Each upcall always has an owner thread. Userland can remove an upcall by
calling kse_exit, when all upcalls in ksegrp are removed, the group is
atomatically shutdown. An upcall owner thread also exits when process is
in exiting state. when an owner thread exits, the upcall it owns is also
removed.

KSE is a pure scheduler entity. it represents a virtual cpu. when a thread
is running, it always has a KSE associated with it. scheduler is free to
assign a KSE to thread according thread priority, if thread priority is changed,
KSE can be moved from one thread to another.

When a ksegrp is created, there is always N KSEs created in the group. the
N is the number of physical cpu in the current system. This makes it is
possible that even an userland UTS is single CPU safe, threads in kernel still
can execute on different cpu in parallel. Userland calls kse_create to add more
upcall structures into ksegrp to increase concurrent in userland itself, kernel
is not restricted by number of upcalls userland provides.

The code hasn't been tested under SMP by author due to lack of hardware.

Reviewed by: julian
2003-01-26 11:41:35 +00:00
Alfred Perlstein
44956c9863 Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
2003-01-21 08:56:16 +00:00
Jeff Roberson
b43179fbe8 - Create a new scheduler api that is defined in sys/sched.h
- Begin moving scheduler specific functionality into sched_4bsd.c
 - Replace direct manipulation of scheduler data with hooks provided by the
   new api.
 - Remove KSE specific state modifications and single runq assumptions from
   kern_switch.c

Reviewed by:	-arch
2002-10-12 05:32:24 +00:00
John Baldwin
5715307f74 - Move p_cpulimit to struct proc from struct plimit and protect it with
sched_lock.  This means that we no longer access p_limit in mi_switch()
  and the p_limit pointer can be protected by the proc lock.
- Remove PRS_ZOMBIE check from CPU limit test in mi_switch().  PRS_ZOMBIE
  processes don't call mi_switch(), and even if they did there is no longer
  the danger of p_limit being NULL (which is what the original zombie check
  was added for).
- When we bump the current processes soft CPU limit in ast(), just bump the
  private p_cpulimit instead of the shared rlimit.  This fixes an XXX for
  some value of fix.  There is still a (probably benign) bug in that this
  code doesn't check that the new soft limit exceeds the hard limit.

Inspired by:	bde (2)
2002-10-09 17:17:24 +00:00
John Baldwin
f4cd8f9ff4 Change p_cpulimit to be in seconds instead of microseconds. Since
p_runtime now is a bintime, it is no longer an optimization to store
p_cpulimit as microseconds.

Suggested by:	phk
2002-09-30 21:08:38 +00:00
Jake Burkholder
05ba50f522 Use the fields in the sysentvec and in the vm map header in place of the
constants VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS, USRSTACK and PS_STRINGS.
This is mainly so that they can be variable even for the native abi, based
on different machine types.  Get stack protections from the sysentvec too.
This makes it trivial to map the stack non-executable for certain abis, on
machines that support it.
2002-09-21 22:07:17 +00:00
Julian Elischer
4f0db5e08c Allocate KSEs and KSEGRPs separatly and remove them from the proc structure.
next step is to allow > 1 to be allocated per process. This would give
multi-processor threads. (when the rest of the infrastructure is
in place)

While doing this I noticed libkvm and sys/kern/kern_proc.c:fill_kinfo_proc
are diverging more than they should.. corrective action needed soon.
2002-09-15 23:52:25 +00:00
John Polstra
f824b5187e Widen struct sockbuf's sb_timeo member to int from short. With
non-default but reasonable values of hz this member overflowed,
breaking NFS over UDP.

Also, as long as I'm plowing up struct sockbuf ... Change certain
members from u_long/long to u_int/int in order to reduce wasted
space on 64-bit machines.  This change was requested by Andrew
Gallatin.

Netstat and systat need to be rebuilt.  I am incrementing
__FreeBSD_version in case any ports need to change.
2002-07-24 03:02:43 +00:00
Alfred Perlstein
016091145e more caddr_t removal. 2002-06-29 02:00:02 +00:00
John Baldwin
f44d9e24fb Change p_can{debug,see,sched,signal}()'s first argument to be a thread
pointer instead of a proc pointer and require the process pointed to
by the second argument to be locked.  We now use the thread ucred reference
for the credential checks in p_can*() as a result.  p_canfoo() should now
no longer need Giant.
2002-05-19 00:14:50 +00:00
John Baldwin
ba626c1db2 Lock proctree_lock instead of pgrpsess_lock. 2002-04-16 17:11:34 +00:00
John Baldwin
bad56603ba - Change donice() to take a thread as the first argument instead of a
process so it can use td_ucred.
- Require the target process of donice() to be locked when donice() is
  called.
- Use td_ucred.
- Lock the target process of p_cansee() and while reading the credentials
  of a process.
- Change the logic of rtprio() slightly so it does it's copyin() if needed
  prior to locking the target process.
- rtprio() no longer needs Giant.  In theory with full KSE it would still
  need Giant to protect p_ucred of curproc for the p_canfoo() functions
  but p_canfoo() will be changing to using td_ucred of curthread before
  full KSE hits the tree.
2002-04-13 23:28:23 +00:00
John Baldwin
6008862bc2 Change callers of mtx_init() to pass in an appropriate lock type name. In
most cases NULL is passed, but in some cases such as network driver locks
(which use the MTX_NETWORK_LOCK macro) and UMA zone locks, a name is used.

Tested on:	i386, alpha, sparc64
2002-04-04 21:03:38 +00:00
John Baldwin
44731cab3b Change the suser() API to take advantage of td_ucred as well as do a
general cleanup of the API.  The entire API now consists of two functions
similar to the pre-KSE API.  The suser() function takes a thread pointer
as its only argument.  The td_ucred member of this thread must be valid
so the only valid thread pointers are curthread and a few kernel threads
such as thread0.  The suser_cred() function takes a pointer to a struct
ucred as its first argument and an integer flag as its second argument.
The flag is currently only used for the PRISON_ROOT flag.

Discussed on:	smp@
2002-04-01 21:31:13 +00:00
Alfred Perlstein
4d77a549fe Remove __P. 2002-03-19 21:25:46 +00:00
Poul-Henning Kamp
c91f7a7332 Cast the variable, not the constant to 64 bits. 2002-02-26 09:27:39 +00:00
Seigo Tanimura
f591779bb5 Lock struct pgrp, session and sigio.
New locks are:

- pgrpsess_lock which locks the whole pgrps and sessions,
- pg_mtx which protects the pgrp members, and
- s_mtx which protects the session members.

Please refer to sys/proc.h for the coverage of these locks.

Changes on the pgrp/session interface:

- pgfind() needs the pgrpsess_lock held.

- The caller of enterpgrp() is responsible to allocate a new pgrp and
  session.

- Call enterthispgrp() in order to enter an existing pgrp.

- pgsignal() requires a pgrp lock held.

Reviewed by:	jhb, alfred
Tested on:	cvsup.jp.FreeBSD.org
		(which is a quad-CPU machine running -current)
2002-02-23 11:12:57 +00:00
Poul-Henning Kamp
1cbb9c3b03 Convert p->p_runtime and PCPU(switchtime) to bintime format. 2002-02-22 13:32:01 +00:00
Julian Elischer
2c1007663f In a threaded world, differnt priorirites become properties of
different entities.  Make it so.

Reviewed by:	jhb@freebsd.org (john baldwin)
2002-02-11 20:37:54 +00:00
Alfred Perlstein
547ce823ef use mutex pool mutexes for uidinfo locking.
replace mutex_lock calls on uidinfo with macro calls:
  mtx_lock(&uidp->ui_mtx) -> UIDINFO_LOCK(uidp)

Terry Lambert <tlambert2@mindspring.com> helped with this.
2002-01-20 22:48:49 +00:00
Peter Wemm
9aefe36fa6 *** empty log message *** 2001-11-04 18:22:48 +00:00
Robert Watson
fc5d29ef7d o Move suser() calls in kern/ to using suser_xxx() with an explicit
credential selection, rather than reference via a thread or process
  pointer.  This is part of a gradual migration to suser() accepting
  a struct ucred instead of a struct proc, simplifying the reference
  and locking semantics of suser().

Obtained from:	TrustedBSD Project
2001-11-01 20:56:57 +00:00
Matthew Dillon
0e9fe2127c Adjust printfs to be time_t agnostic. 2001-10-28 22:53:45 +00:00
Paul Saab
cbc89bfbfe Make MAXTSIZ, DFLDSIZ, MAXDSIZ, DFLSSIZ, MAXSSIZ, SGROWSIZ loader
tunable.

Reviewed by:	peter
MFC after:	2 weeks
2001-10-10 23:06:54 +00:00
Julian Elischer
b40ce4165d KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after:    ha ha ha ha
2001-09-12 08:38:13 +00:00
John Baldwin
e342cd279f Use sched_lock to protect rtp_to_pri() and pri_to_rtp() when needed. 2001-09-02 01:05:36 +00:00
Matthew Dillon
835a82ee2d Giant Pushdown. Saved the worst P4 tree breakage for last.
reboot() getpriority() setpriority() rtprio() osetrlimit() ogetrlimit()
    setrlimit() getrlimit() getrusage() getpid() getppid() getpgrp()
    getpgid() getsid() getgid() getegid() getgroups() setsid() setpgid()
    setuid() seteuid() setgid() setegid() setgroups() setreuid() setregid()
    setresuid() setresgid() getresuid() getresgid () __setugid() getlogin()
    setlogin() modnext() modfnext() modstat() modfind() kldload() kldunload()
    kldfind() kldnext() kldstat() kldfirstmod() kldsym() getdtablesize()
    dup2() dup() fcntl() close() ofstat() fstat() nfsstat() fpathconf()
    flock()
2001-09-01 19:04:37 +00:00