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f82c6950be
freebsd-nq/sys/kern
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John Baldwin f82c6950be - Split the itismychild() function into two functions: insertchild() 
adds a witness to the child list of a parent witness.  rebalancetree()
  runs through the entire tree removing direct descendants of witnesses
  who already have said child witness as an indirect descendant through
  another direct descendant.  itismychild() now calls insertchild()
  followed by rebalancetree() and no longer needs the evil hack of
  having static recursed variable.
- Add a function reparentchildren() that adds all the direct descendants
  of one witness as direct descendants of another witness.
- Change the return value of itismychild() and similar functions so that
  they return 0 in the case of failure due to lack of resources instead
  of 1.  This makes the return value more intuitive.
- Check the return value of itismychild() when defining the static lock
  order in witness_initialize().
- Don't try to setup a lock instance in witness_lock() if itismychild()
  fails.  Witness is hosed anyways so no need to do any more witness
  related activity at that point.  It also makes the code flow easier to
  understand.
- Add a new depart() function as the opposite of enroll().  When the
  reference count of a witness drops to 0 in witness_destroy(), this
  function is called on that witness.  First, it runs through the
  lock order tree using reparentchildren() to reparent direct descendants
  of the departing witness to each of the witness' parents in the tree.
  Next, it releases it's own child list and other associated resources.
  Finally it calls rebalanacetree() to rebalance the lock order tree.
- Sort function prototypes into something closer to alphabetical order.

As a result of these changes, there should no longer be 'dead' witnesses
in the order tree, and repeatedly loading and unloading a module should no
longer exhaust witness of its internal resources.

Inspired by:	gallatin
2003-03-11 22:07:35 +00:00
..
bus_if.m Add two interfaces to allow for busses to report the pnpinfo for 2002-10-07 05:06:38 +00:00
clock_if.m
device_if.m
genassym.sh
imgact_aout.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
imgact_elf32.c Improve the way that an elf image activator for an alternate word size is 2003-01-04 22:07:48 +00:00
imgact_elf64.c Improve the way that an elf image activator for an alternate word size is 2003-01-04 22:07:48 +00:00
imgact_elf.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
imgact_gzip.c Correct typos, mostly s/ a / an / where appropriate. Some whitespace cleanup, 2003-01-01 18:49:04 +00:00
imgact_shell.c Correct typos, mostly s/ a / an / where appropriate. Some whitespace cleanup, 2003-01-01 18:49:04 +00:00
inflate.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
init_main.c Use the proc lock to protect p_realtimer instead of Giant, and obtain 2003-02-17 10:03:02 +00:00
init_sysent.c Add a timeout parameter to kse_release. 2003-02-20 08:18:15 +00:00
kern_acct.c Remove the PL_SHAREMOD flag from struct plimit, which could have been 2003-02-20 04:18:42 +00:00
kern_acl.c Bow to the whining masses and change a union back into void *. Retain 2003-01-13 00:33:17 +00:00
kern_alq.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
kern_clock.c Update netisr handling; Each SWI now registers its queue, and all queue 2003-03-04 23:19:55 +00:00
kern_condvar.c Replace calls to WITNESS_SLEEP() and witness_list() with equivalent calls 2003-03-04 21:03:05 +00:00
kern_conf.c Add one little hack to allow us to make MAJOR_AUTO be zero: 2003-03-09 10:28:05 +00:00
kern_context.c Add getcontext, setcontext, and swapcontext as system calls. 2002-11-16 06:35:53 +00:00
kern_descrip.c Gigacommit to improve device-driver source compatibility between 2003-03-03 12:15:54 +00:00
kern_environment.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
kern_event.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
kern_exec.c Change the process flags P_KSES to be P_THREADED. 2003-02-27 02:05:19 +00:00
kern_exit.c Fix threaded process job control bug. SMP tested. 2003-03-11 00:07:53 +00:00
kern_fork.c Change the process flags P_KSES to be P_THREADED. 2003-02-27 02:05:19 +00:00
kern_idle.c - Create a new scheduler api that is defined in sys/sched.h 2002-10-12 05:32:24 +00:00
kern_intr.c Add a WITNESS_WARN() call to verify that we hold no locks after running 2003-03-04 21:01:42 +00:00
kern_jail.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
kern_kse.c Lock proc lock before changing p_flag. 2003-03-11 03:16:02 +00:00
kern_kthread.c Some kernel threads try to do significant work, and the default KSTACK_PAGES 2002-10-02 07:44:29 +00:00
kern_ktr.c Trim leading "../" sequences from filenames. 2003-03-11 19:56:16 +00:00
kern_ktrace.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
kern_linker.c FreeBSD 5.0 has stopped shipping /modules 2.5 years ago. Catch 2003-03-03 22:53:35 +00:00
kern_lock.c Use the KTR_LOCK mask for logging events via KTR in lockmgr() rather 2003-03-11 20:00:37 +00:00
kern_lockf.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
kern_mac.c Instrument sysarch() MD privileged I/O access interfaces with a MAC 2003-03-06 04:47:47 +00:00
kern_malloc.c PHCC[1]: 2003-03-10 20:24:54 +00:00
kern_mib.c - Provide backwards compatibility for kern.fallback_elf_brand. 2003-01-05 03:48:14 +00:00
kern_module.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
kern_mtxpool.c
kern_mutex.c Axe the useless MTX_SLEEPABLE flag. mutexes are not sleepable locks. 2003-03-11 20:02:57 +00:00
kern_ntptime.c Explicitly have the timecounter init happen after the cpu_initclocks is 2003-01-06 01:01:08 +00:00
kern_physio.c Close the remaining user address mapping races for physical 2003-01-20 17:46:48 +00:00
kern_poll.c Update netisr handling; Each SWI now registers its queue, and all queue 2003-03-04 23:19:55 +00:00
kern_proc.c Change the process flags P_KSES to be P_THREADED. 2003-02-27 02:05:19 +00:00
kern_prot.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
kern_resource.c Remove the PL_SHAREMOD flag from struct plimit, which could have been 2003-02-20 04:18:42 +00:00
kern_sema.c
kern_shutdown.c style. 2003-02-14 12:44:48 +00:00
kern_sig.c Fix threaded process job control bug. SMP tested. 2003-03-11 00:07:53 +00:00
kern_subr.c Zero copy send and receive fixes: 2003-03-08 06:58:18 +00:00
kern_switch.c Cosmetic change, make it QUEUE_MACRO_DEBUG friendly 2003-03-09 04:27:46 +00:00
kern_sx.c
kern_synch.c Replace calls to WITNESS_SLEEP() and witness_list() with equivalent calls 2003-03-04 21:03:05 +00:00
kern_syscalls.c
kern_sysctl.c Use a shorter and less redundant name for the sysctl tree lock. 2003-03-11 20:01:51 +00:00
kern_tc.c Move timecounters notion of frequency to 64 bits. 2003-01-29 11:29:22 +00:00
kern_thread.c Lock proc lock before changing p_flag. 2003-03-11 03:16:02 +00:00
kern_time.c o fix ppsratecheck to interpret a maxpps of zero as "ignore everything" 2003-02-26 17:16:38 +00:00
kern_timeout.c Under DIAGNOSTIC, only report expensive timeouts if they are more expensive 2003-02-01 10:06:40 +00:00
kern_uuid.c SMP locking for ifnet list. 2002-12-22 05:35:03 +00:00
kern_xxx.c
ksched.c Move a bunch of flags from the KSE to the thread. 2003-02-17 09:55:10 +00:00
link_elf_obj.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
link_elf.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
linker_if.m
Make.tags.inc Finish driving a stake through the heart of netns and the associated 2003-03-05 19:24:24 +00:00
Makefile Finish driving a stake through the heart of netns and the associated 2003-03-05 19:24:24 +00:00
makesyscalls.sh The syscall names are string constants, so make them consts. 2002-10-29 15:47:06 +00:00
md4c.c
md5c.c We have memset() and memcpy() in the kernel now, so we don't need to 2002-10-20 22:33:42 +00:00
p1003_1b.c Use copyout to access user memory. 2003-01-07 20:10:04 +00:00
posix4_mib.c Rework the sysconf(3) interaction with aio: 2002-11-17 04:15:34 +00:00
sched_4bsd.c Change the process flags P_KSES to be P_THREADED. 2003-02-27 02:05:19 +00:00
sched_ule.c - Create a function sched_interact_score() which decides on the 2003-03-04 02:45:59 +00:00
subr_acl_posix1e.c Bow to the whining masses and change a union back into void *. Retain 2003-01-13 00:33:17 +00:00
subr_autoconf.c
subr_blist.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
subr_bus.c Gigacommit to improve device-driver source compatibility between 2003-03-03 12:15:54 +00:00
subr_clist.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
subr_clock.c Split the global timezone structure into two integer fields to 2003-02-03 19:49:35 +00:00
subr_devstat.c Note that MAJOR_AUTO is now the default if d_maj is not initialized. This 2003-03-09 11:03:45 +00:00
subr_disk.c Don't pick up a name from the dev_t if it is not there. 2003-03-03 11:14:36 +00:00
subr_eventhandler.c Rework the eventhandler locking for hopefully the last time. The scheme 2003-03-11 20:17:00 +00:00
subr_hints.c
subr_kobj.c
subr_log.c Gigacommit to improve device-driver source compatibility between 2003-03-03 12:15:54 +00:00
subr_mbuf.c PHCC[1]: 2003-03-10 20:24:54 +00:00
subr_mchain.c The "m = m->m_next" that was removed in the revision 1.12 was necessary 2003-02-19 10:12:42 +00:00
subr_module.c
subr_param.c Change hw.physmem and hw.usermem to unsigned long like they used to be 2002-08-30 04:04:37 +00:00
subr_pcpu.c
subr_power.c Use ISO 9X variadic macro format; arguments are not optional, just 2002-07-15 17:17:56 +00:00
subr_prf.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
subr_prof.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
subr_rman.c Implement rman_get_device 2003-02-12 07:00:59 +00:00
subr_rtc.c Split the global timezone structure into two integer fields to 2003-02-03 19:49:35 +00:00
subr_sbuf.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
subr_scanf.c Fix mis-indentation. 2002-10-02 09:09:25 +00:00
subr_smp.c Move a bunch of flags from the KSE to the thread. 2003-02-17 09:55:10 +00:00
subr_taskqueue.c Introduce a new taskqueue that runs completely free of Giant, and in 2003-02-26 03:15:42 +00:00
subr_trap.c Fix signal delivering bug for threaded process. 2003-03-11 02:59:50 +00:00
subr_turnstile.c Axe the useless MTX_SLEEPABLE flag. mutexes are not sleepable locks. 2003-03-11 20:02:57 +00:00
subr_witness.c - Split the itismychild() function into two functions: insertchild() 2003-03-11 22:07:35 +00:00
subr_xxx.c Make nokqfilter() return the correct return value. 2003-03-03 16:24:47 +00:00
sys_generic.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
sys_pipe.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
sys_process.c Add a missing PROC_UNLOCK in ptrace() for the PT_IO case. 2002-10-16 16:28:33 +00:00
sys_socket.c Remove duplicate includes. 2003-02-20 03:26:11 +00:00
syscalls.c Add a timeout parameter to kse_release. 2003-02-20 08:18:15 +00:00
syscalls.master Add a timeout parameter to kse_release. 2003-02-20 08:18:15 +00:00
sysv_ipc.c It is possible for an active aio to prevent shared memory from being 2003-01-13 23:04:32 +00:00
sysv_msg.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
sysv_sem.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
sysv_shm.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
tty_compat.c
tty_conf.c
tty_cons.c Don't call make_dev() before we are ready for it. 2003-03-09 20:42:49 +00:00
tty_pty.c Make TTYHOG tunable. 2003-03-05 08:16:29 +00:00
tty_subr.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
tty_tty.c Gigacommit to improve device-driver source compatibility between 2003-03-03 12:15:54 +00:00
tty.c Make TTYHOG tunable. 2003-03-05 08:16:29 +00:00
uipc_accf.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
uipc_cow.c Remove some unnecessary actions by the zero-copy setup and teardown code. 2003-03-09 20:38:56 +00:00
uipc_domain.c Fix a spelling error. 2003-03-07 22:47:32 +00:00
uipc_jumbo.c Remove duplicate includes. 2003-02-20 03:26:11 +00:00
uipc_mbuf2.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
uipc_mbuf.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
uipc_proto.c
uipc_sem.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
uipc_sockbuf.c Missing M_TRYWAIT from so_upcall third argument. 2003-02-21 22:23:40 +00:00
uipc_socket2.c Missing M_TRYWAIT from so_upcall third argument. 2003-02-21 22:23:40 +00:00
uipc_socket.c Clean up whitespace, s/register //, refrain from strong urge to ANSIfy. 2003-03-02 15:56:49 +00:00
uipc_syscalls.c Remove GIANT_REQUIRED from sf_buf_free(). 2003-03-06 04:48:19 +00:00
uipc_usrreq.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
vfs_acl.c Bow to the whining masses and change a union back into void *. Retain 2003-01-13 00:33:17 +00:00
vfs_aio.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
vfs_bio.c - Add a new 'flags' parameter to getblk(). 2003-03-04 00:04:44 +00:00
vfs_cache.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
vfs_cluster.c - Regularize variable usage in cluster_read(). 2003-03-11 06:14:03 +00:00
vfs_default.c Remove trainling whitespace. 2003-03-10 21:55:00 +00:00
vfs_export.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
vfs_extattr.c Move the initialization of the vattr flags field in setfflags() to 2003-03-05 23:15:23 +00:00
vfs_init.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
vfs_lookup.c Back out M_* changes, per decision of the TRB. 2003-02-19 05:47:46 +00:00
vfs_mount.c Export the name of the device used to mount the root file system as 2003-02-22 05:01:12 +00:00
vfs_subr.c Remove ENABLE_VFS_IOOPT. It is a long unfinished work-in-progress. 2003-03-06 03:41:02 +00:00
vfs_syscalls.c Move the initialization of the vattr flags field in setfflags() to 2003-03-05 23:15:23 +00:00
vfs_vnops.c Do not allow kqueues to be passed via unix domain sockets. 2003-02-15 06:04:55 +00:00
vnode_if.src Temporarily introduce a new VOP_SPECSTRATEGY operation while I try 2003-01-04 22:10:36 +00:00