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freebsd-nq/sys/kern
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John Baldwin da7bbd2c08 If a thread that is swapped out is made runnable, then the setrunnable() 
routine wakes up proc0 so that proc0 can swap the thread back in.
Historically, this has been done by waking up proc0 directly from
setrunnable() itself via a wakeup().  When waking up a sleeping thread
that was swapped out (the usual case when waking proc0 since only sleeping
threads are eligible to be swapped out), this resulted in a bit of
recursion (e.g. wakeup() -> setrunnable() -> wakeup()).

With sleep queues having separate locks in 6.x and later, this caused a
spin lock LOR (sleepq lock -> sched_lock/thread lock -> sleepq lock).
An attempt was made to fix this in 7.0 by making the proc0 wakeup use
the ithread mechanism for doing the wakeup.  However, this required
grabbing proc0's thread lock to perform the wakeup.  If proc0 was asleep
elsewhere in the kernel (e.g. waiting for disk I/O), then this degenerated
into the same LOR since the thread lock would be some other sleepq lock.

Fix this by deferring the wakeup of the swapper until after the sleepq
lock held by the upper layer has been locked.  The setrunnable() routine
now returns a boolean value to indicate whether or not proc0 needs to be
woken up.  The end result is that consumers of the sleepq API such as
*sleep/wakeup, condition variables, sx locks, and lockmgr, have to wakeup
proc0 if they get a non-zero return value from sleepq_abort(),
sleepq_broadcast(), or sleepq_signal().

Discussed with:	jeff
Glanced at by:	sam
Tested by:	Jurgen Weber  jurgen - ish com au
MFC after:	2 weeks
2008-08-05 20:02:31 +00:00
..
bus_if.m Implement a BUS_BIND_INTR() method in the bus interface to bind an IRQ 2008-03-20 21:24:32 +00:00
clock_if.m
cpufreq_if.m
device_if.m
genassym.sh refactor code so it can run in a chroot without having to have /dev/mounted 2008-01-18 17:02:14 +00:00
imgact_aout.c VOP_LOCK1() (and so VOP_LOCK()) and VOP_UNLOCK() are only used in 2008-01-13 14:44:15 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c Go back to using the process command name (p_comm) for the file name and 2008-05-15 03:07:34 +00:00
imgact_gzip.c VOP_LOCK1() (and so VOP_LOCK()) and VOP_UNLOCK() are only used in 2008-01-13 14:44:15 +00:00
imgact_shell.c
inflate.c
init_main.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
init_sysent.c Add code to allow the system to handle multiple routing tables. 2008-05-09 23:03:00 +00:00
kern_acct.c VOP_LOCK1() (and so VOP_LOCK()) and VOP_UNLOCK() are only used in 2008-01-13 14:44:15 +00:00
kern_alq.c Use msleep_spin() instead of unlock/tsleep/lock. This was 2008-07-02 20:44:33 +00:00
kern_clock.c Implement per-cpu callout threads, wheels, and locks. 2008-04-02 11:20:30 +00:00
kern_condvar.c If a thread that is swapped out is made runnable, then the setrunnable() 2008-08-05 20:02:31 +00:00
kern_conf.c Make it atomic for the devfs_populate_loop() to see the setting of 2008-07-11 11:22:19 +00:00
kern_context.c Further system call comment cleanup: 2007-03-05 13:10:58 +00:00
kern_cpu.c Fix a few edge cases with error handling in cpufreq(4)'s CPUFREQ_GET() 2008-05-05 19:13:52 +00:00
kern_cpuset.c Add a `show cpusets' DDB command to print numbered root and 2008-07-07 21:32:02 +00:00
kern_ctf.c Add the CTF source file which gets shared with link_elf.c and link_elf_obj.c. 2008-05-23 03:04:27 +00:00
kern_descrip.c Rework the lifetime management of the kernel implementation of POSIX 2008-06-27 05:39:04 +00:00
kern_dtrace.c Remove code that isn't required. It actually breaks the case where KDTRACE_HOOKS 2008-06-16 04:44:29 +00:00
kern_environment.c Implement the following macros for completeness: 2008-07-21 15:05:25 +00:00
kern_event.c The kqueue_register() function assumes that it is called from the top of 2008-07-07 09:30:11 +00:00
kern_exec.c Call pargs_drop() unconditionally in do_execve(), the function correctly 2008-07-25 11:55:32 +00:00
kern_exit.c Add DTrace 'proc' provider probes using the Statically Defined Trace 2008-05-24 06:22:16 +00:00
kern_fork.c Do the pargs_hold() on the copy of the pointer to the p_args of the 2008-07-23 08:45:25 +00:00
kern_idle.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
kern_intr.c revert change from local tree 2008-07-18 07:07:57 +00:00
kern_jail.c MFp4 144659: 2008-07-07 20:53:49 +00:00
kern_kthread.c Kill a dead variable 2008-08-03 21:07:19 +00:00
kern_ktr.c Remove slightly oddly placed suser() call from the KTR/ALQ setup sysctl: 2006-09-09 16:09:01 +00:00
kern_ktrace.c This patch adds a new ktrace(2) record type, KTR_STRUCT, whose payload 2008-02-23 01:01:49 +00:00
kern_linker.c Add the ctf_get function and update the args to linker_file_function_listall. 2008-05-23 07:08:59 +00:00
kern_lock.c If a thread that is swapped out is made runnable, then the setrunnable() 2008-08-05 20:02:31 +00:00
kern_lockf.c Re-implement the client side of rpc.lockd in the kernel. This implementation 2008-06-26 10:21:54 +00:00
kern_malloc.c Enable the creation of a kmem map larger than 4GB. 2008-07-05 19:34:33 +00:00
kern_mbuf.c Reintroduce UMA_SLAB_KMAP; however, change its spelling to 2008-04-04 18:41:12 +00:00
kern_mib.c Introduce a new lock, hostname_mtx, and use it to synchronize access 2008-07-05 13:10:10 +00:00
kern_module.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
kern_mtxpool.c Universally adopt most conventional spelling of acquire. 2007-05-27 20:50:23 +00:00
kern_mutex.c Add KASSERT()'s to catch attempts to recurse on spin mutexes that aren't 2008-02-13 23:39:05 +00:00
kern_ntptime.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
kern_physio.c
kern_pmc.c Kernel and hwpmc(4) support for callchain capture. 2007-12-07 08:20:17 +00:00
kern_poll.c Remove NETISR_MPSAFE, which allows specific netisr handlers to be directly 2008-07-04 00:21:38 +00:00
kern_priv.c Add __FBSDID() tag. 2008-03-07 15:27:08 +00:00
kern_proc.c Call pargs_drop() unconditionally in do_execve(), the function correctly 2008-07-25 11:55:32 +00:00
kern_prot.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
kern_resource.c Remove extra uihold() call that accidentally sneak in during perforce 2008-03-19 07:52:07 +00:00
kern_rmlock.c Expand lock class with the "virtual" function lc_assert which will offer 2007-11-18 14:43:53 +00:00
kern_rwlock.c Improve a comment which, in the actual CVS stock, doesn't completely 2008-05-27 00:27:50 +00:00
kern_sdt.c Add kernel support for the Statically Defined Trace provider. 2008-05-18 19:32:36 +00:00
kern_sema.c
kern_shutdown.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
kern_sig.c If a thread that is swapped out is made runnable, then the setrunnable() 2008-08-05 20:02:31 +00:00
kern_subr.c - Make SCHED_STATS more generic by adding a wrapper to create the 2008-04-17 04:20:10 +00:00
kern_switch.c fix typo in runz_fuzz 2008-05-12 06:42:06 +00:00
kern_sx.c If a thread that is swapped out is made runnable, then the setrunnable() 2008-08-05 20:02:31 +00:00
kern_synch.c If a thread that is swapped out is made runnable, then the setrunnable() 2008-08-05 20:02:31 +00:00
kern_syscalls.c Make system call modules a bit more robust: 2006-08-01 16:32:20 +00:00
kern_sysctl.c Add sysctl_rename_oid() to support device_set_unit() usage. Otherwise, 2007-11-30 21:29:08 +00:00
kern_tc.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
kern_thr.c Fix compiling problem. 2008-04-29 05:48:05 +00:00
kern_thread.c If a thread that is swapped out is made runnable, then the setrunnable() 2008-08-05 20:02:31 +00:00
kern_time.c Make sure reading td_runtime in critical section since thread may be 2008-01-18 13:00:28 +00:00
kern_timeout.c add callout_schedule; besides being useful it also improves 2008-08-02 17:42:38 +00:00
kern_umtx.c Add two commands to _umtx_op system call to allow a simple mutex to be 2008-06-24 07:32:12 +00:00
kern_uuid.c Correct typo. 2007-04-23 12:53:00 +00:00
kern_xxx.c Introduce a new lock, hostname_mtx, and use it to synchronize access 2008-07-05 13:10:10 +00:00
ksched.c Commit 14/14 of sched_lock decomposition. 2007-06-05 00:00:57 +00:00
link_elf_obj.c Calling linker_load_dependencies() while holding the module' 2008-08-03 13:33:45 +00:00
link_elf.c Calling linker_load_dependencies() while holding the module' 2008-08-03 13:33:45 +00:00
linker_if.m Add the ctf_get method. 2008-05-23 04:06:49 +00:00
Make.tags.inc Remove netatm from HEAD as it is not MPSAFE and relies on the now removed 2008-05-25 22:11:40 +00:00
Makefile style.Makefile(5) 2007-12-14 21:30:51 +00:00
makesyscalls.sh Generate another function for the DTrace syscall provider to specify 2008-03-27 01:53:44 +00:00
md4c.c
md5c.c
p1003_1b.c Remove kernel support for M:N threading. 2008-03-12 10:12:01 +00:00
posix4_mib.c Fix mispatch of includes list; allows my kernel to build successfully. 2006-11-12 03:34:03 +00:00
sched_4bsd.c When choosing a CPU for a thread in a cpuset, prefer the last CPU that the 2008-07-28 20:39:21 +00:00
sched_ule.c - Check whether we've recorded this tick in ts_ticks on another cpu in 2008-07-19 05:13:47 +00:00
serdev_if.m
stack_protector.c Fix a chicken-and-egg problem: this files implements SSP support, 2008-06-26 07:52:45 +00:00
subr_acl_posix1e.c Eliminate now-unused SUSER_ALLOWJAIL arguments to priv_check_cred(); in 2007-06-12 00:12:01 +00:00
subr_autoconf.c If run_interrupt_driven_config_hooks() waits 360 seconds and INVARIANTS 2008-07-21 20:50:49 +00:00
subr_blist.c add malloc flag to blist so that it can be used in ithread context 2008-05-05 19:48:54 +00:00
subr_bus.c Split out the probing magic of device_probe_and_attach into 2008-06-20 16:58:15 +00:00
subr_clist.c Don't make subr_clist.c depend on the TTY layer. 2008-07-30 12:32:42 +00:00
subr_clock.c Now that all platforms use genclock, shuffle things around slightly 2008-04-22 19:38:30 +00:00
subr_devstat.c
subr_disk.c Add a new I/O request - BIO_FLUSH, which basically tells providers below to 2006-10-31 21:11:21 +00:00
subr_eventhandler.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
subr_fattime.c Better naming of fattime conversion functions, they do convert to timespec 2006-10-24 10:27:23 +00:00
subr_firmware.c Do image loading in a context known to have a root directory: 2008-04-09 19:07:48 +00:00
subr_hints.c
subr_kdb.c Expand kdb_alt_break a little, most commonly used with the option 2008-05-04 23:29:38 +00:00
subr_kobj.c
subr_lock.c - track maximum wait time 2008-07-27 21:45:20 +00:00
subr_log.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
subr_mbpool.c Add parens around *free in *free++ in mbp_count() so that mbp_count() 2007-05-27 17:38:36 +00:00
subr_mchain.c Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
subr_module.c
subr_msgbuf.c
subr_param.c Correct an error in the comments for init_param3(). 2008-07-04 19:36:58 +00:00
subr_pcpu.c generally we are interested in what thread did something as 2007-11-14 06:21:24 +00:00
subr_power.c
subr_prf.c Instead of doing comparisons using the pcpu area to see if 2007-03-08 06:44:34 +00:00
subr_prof.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
subr_rman.c Complete removal of restriction about overlaps to rman_manage_region: 2007-04-28 07:37:49 +00:00
subr_rtc.c Now that all platforms use genclock, shuffle things around slightly 2008-04-22 19:38:30 +00:00
subr_sbuf.c
subr_scanf.c
subr_sleepqueue.c If a thread that is swapped out is made runnable, then the setrunnable() 2008-08-05 20:02:31 +00:00
subr_smp.c Allow a rendezvous with just a specified CPU too. 2008-05-23 04:05:26 +00:00
subr_stack.c Staticize M_STACK. 2008-07-13 17:15:05 +00:00
subr_taskqueue.c revert local change 2008-07-18 07:10:33 +00:00
subr_trap.c - Make SCHED_STATS more generic by adding a wrapper to create the 2008-04-17 04:20:10 +00:00
subr_turnstile.c - Make SCHED_STATS more generic by adding a wrapper to create the 2008-04-17 04:20:10 +00:00
subr_unit.c Since cdev mutex is after system map mutex in global lock order, free() 2007-07-04 06:56:58 +00:00
subr_witness.c witness_addgraph() is required even if DDB isn't compiled into the kernel, 2008-07-19 17:47:23 +00:00
sys_generic.c - Remove stale comment. 2008-03-19 07:33:16 +00:00
sys_pipe.c Another problem caused by the knlist_cleardel() potentially dropping 2008-05-23 11:14:03 +00:00
sys_process.c - Relax requirements for p_numthreads, p_threads, p_swtick, and p_nice from 2008-03-19 06:19:01 +00:00
sys_socket.c Add code to allow the system to handle multiple routing tables. 2008-05-09 23:03:00 +00:00
syscalls.c Add code to allow the system to handle multiple routing tables. 2008-05-09 23:03:00 +00:00
syscalls.master Add code to allow the system to handle multiple routing tables. 2008-05-09 23:03:00 +00:00
systrace_args.c Add code to allow the system to handle multiple routing tables. 2008-05-09 23:03:00 +00:00
sysv_ipc.c Eliminate now-unused SUSER_ALLOWJAIL arguments to priv_check_cred(); in 2007-06-12 00:12:01 +00:00
sysv_msg.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
sysv_sem.c Renew semaphore's pointer after wakeup since during msleep 2008-06-19 18:08:42 +00:00
sysv_shm.c Make sure we restrict Linux only IPC calls from being executed 2008-02-12 20:55:03 +00:00
tty_compat.c
tty_conf.c
tty_cons.c Move TTY unrelated bits out of <sys/tty.h>. 2008-05-23 16:06:35 +00:00
tty_info.c Move ttyinfo() into its own C file. 2008-07-25 14:31:00 +00:00
tty_pts.c - Close a race with concurrent open's of a pts master device which could 2008-08-04 19:49:05 +00:00
tty_pty.c Close two different races with concurrent opens of pty master devices 2008-08-04 19:51:23 +00:00
tty_tty.c Remove unneeded Giant locking of /dev/tty. 2008-06-03 12:38:00 +00:00
tty.c Move ttyinfo() into its own C file. 2008-07-25 14:31:00 +00:00
uipc_accf.c
uipc_cow.c Give MEXTADD() another argument to make both void pointers to the 2008-02-01 19:36:27 +00:00
uipc_debug.c Change a variable name to not shadow a global 2008-07-03 08:35:59 +00:00
uipc_domain.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
uipc_mbuf2.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
uipc_mbuf.c Attempt to make the print types more friendly to other architectures. 2008-04-30 20:00:30 +00:00
uipc_mqueue.c - Use vget() to lock the vnode rather than refing without a lock and 2008-03-29 23:30:40 +00:00
uipc_sem.c Rework the lifetime management of the kernel implementation of POSIX 2008-06-27 05:39:04 +00:00
uipc_shm.c Rework the lifetime management of the kernel implementation of POSIX 2008-06-27 05:39:04 +00:00
uipc_sockbuf.c Update the kernel to count the number of mbufs and clusters 2008-05-15 20:18:44 +00:00
uipc_socket.c Add accessor functions for socket fields. 2008-07-21 00:49:34 +00:00
uipc_syscalls.c When sendto(2) is called with an explicit destination address 2008-05-22 07:18:54 +00:00
uipc_usrreq.c Fill in a few sysctl descriptions. 2008-07-26 00:55:35 +00:00
vfs_acl.c Add the support for the AT_FDCWD and fd-relative name lookups to the 2008-03-31 12:01:21 +00:00
vfs_aio.c Use minimum of max_aio_procs and target_aio_procs when spawning new 2008-06-21 11:34:34 +00:00
vfs_bio.c Eliminate dead code. (The commit message for revision 1.287 explains why 2008-07-20 04:13:51 +00:00
vfs_cache.c Currently, BSM audit pathname token generation for chrooted or jailed 2008-07-31 16:57:41 +00:00
vfs_cluster.c - Complete part of the unfinished bufobj work by consistently using 2008-03-22 09:15:16 +00:00
vfs_default.c Move the head of byte-level advisory lock list from the 2008-04-16 11:33:32 +00:00
vfs_export.c Provide the mutual exclusion between the nfs export list modifications 2008-06-09 10:31:38 +00:00
vfs_extattr.c Add the support for the AT_FDCWD and fd-relative name lookups to the 2008-03-31 12:01:21 +00:00
vfs_hash.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
vfs_init.c Remove VFS_VPTOFH entirely. API is already broken and it is good time to 2007-02-16 17:32:41 +00:00
vfs_lookup.c Implement the linux syscalls 2008-04-08 09:45:49 +00:00
vfs_mount.c In nmount(), if we see "update" in the mount options, 2008-07-12 20:12:40 +00:00
vfs_subr.c Remove the use of lbolt from the VFS syncer. 2008-07-30 12:39:18 +00:00
vfs_syscalls.c If S_IFIFO is passed to mknod(2), invoke kern_mkfifoat(9) to create a 2008-06-22 21:51:32 +00:00
vfs_vnops.c Remove broken code to replace st_mode value with ACCESSPERMS when 2008-08-03 15:44:56 +00:00
vnode_if.src Add the new kernel-mode NFS Lock Manager. To use it instead of the 2008-03-26 15:23:12 +00:00