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49aead8a10
freebsd-skq/sys/kern
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Attilio Rao 49aead8a10 Simplify the adaptive spinning algorithm in rwlock and mutex: 
currently, before to spin the turnstile spinlock is acquired and the
waiters flag is set.
This is not strictly necessary, so just spin before to acquire the
spinlock and to set the flags.
This will simplify a lot other functions too, as now we have the waiters
flag set only if there are actually waiters.
This should make wakeup/sleeping couplet faster under intensive mutex
workload.
This also fixes a bug in rw_try_upgrade() in the adaptive case, where
turnstile_lookup() will recurse on the ts_lock lock that will never be
really released [1].

[1] Reported by: jeff with Nokia help
Tested by: pho, kris (earlier, bugged version of rwlock part)
Discussed with: jhb [2], jeff
MFC after: 1 week

[2] John had a similar patch about 6.x and/or 7.x about mutexes probabilly
2007-11-26 22:37:35 +00:00
..
bus_if.m o break newbus api: add a new argument of type driver_filter_t to 2007-02-23 12:19:07 +00:00
clock_if.m
cpufreq_if.m
device_if.m
genassym.sh
imgact_aout.c Fix for the panic("vm_thread_new: kstack allocation failed") and 2007-11-05 11:36:16 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c A bunch more files that should probably print out a thread name 2007-11-14 06:51:33 +00:00
imgact_gzip.c Fix for the panic("vm_thread_new: kstack allocation failed") and 2007-11-05 11:36:16 +00:00
imgact_shell.c
inflate.c
init_main.c - Add in missing event handler invokes for initial proc and thread. 2007-11-18 13:56:51 +00:00
init_sysent.c Regenerate. 2007-08-16 05:32:26 +00:00
kern_acct.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
kern_alq.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
kern_clock.c generally we are interested in what thread did something as 2007-11-14 06:21:24 +00:00
kern_condvar.c Commit 2/14 of sched_lock decomposition. 2007-06-04 23:50:56 +00:00
kern_conf.c Revert destroy_dev() to the state before destroy_dev_sched() was introduced. 2007-07-05 13:04:59 +00:00
kern_context.c Further system call comment cleanup: 2007-03-05 13:10:58 +00:00
kern_cpu.c If we're on an SMP kernel and there is more than 1 CPU, reject any attempts 2007-10-30 22:18:08 +00:00
kern_descrip.c Remove the now-unused NET_{LOCK,UNLOCK,ASSERT}_GIANT() macros, which 2007-08-06 14:26:03 +00:00
kern_environment.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
kern_event.c Revert previous commits which I committed by mistake. 2007-07-14 21:23:31 +00:00
kern_exec.c Make sure there is a good default thread name for all threads. 2007-11-14 06:04:57 +00:00
kern_exit.c Introduce a way to make pure kernal threads. 2007-10-26 08:00:41 +00:00
kern_fork.c When forking, the new thread deserves a name too. Don't just use the 2007-11-15 02:13:44 +00:00
kern_idle.c rename the process to 'idle' and 'intr' as per jhb. 2007-10-27 00:52:26 +00:00
kern_intr.c fix typo in code normally not compiled in. 2007-10-29 20:45:31 +00:00
kern_jail.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
kern_kse.c Fix build. 2007-11-15 14:16:20 +00:00
kern_kthread.c Acquire the process mutex and spin locks before calling thread_exit() in 2007-11-15 21:45:17 +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 A bunch more files that should probably print out a thread name 2007-11-14 06:51:33 +00:00
kern_linker.c Add a function to list symbols in a file and their values at the 2007-11-18 00:23:31 +00:00
kern_lock.c transferlockers() is a very dangerous and hack-ish function as waiters 2007-11-24 04:22:28 +00:00
kern_lockf.c Do not call free() while holding vnode interlock. 2007-08-07 09:04:50 +00:00
kern_malloc.c Use vm_offset_t for kmembase and kmemlimit rather than char *, avoiding 2007-06-27 13:39:38 +00:00
kern_mbuf.c style(9) 2007-10-26 16:33:47 +00:00
kern_mib.c Revert VMCNT_* operations introduction. 2007-05-31 22:52:15 +00:00
kern_module.c Remove 'MPSAFE' annotations from the comments above most system calls: all 2007-03-04 22:36:48 +00:00
kern_mtxpool.c Universally adopt most conventional spelling of acquire. 2007-05-27 20:50:23 +00:00
kern_mutex.c Simplify the adaptive spinning algorithm in rwlock and mutex: 2007-11-26 22:37:35 +00:00
kern_ntptime.c Only require privilege to set the current time adjustment, not in order to 2007-06-14 18:37:58 +00:00
kern_physio.c
kern_pmc.c
kern_poll.c Remove the now-unused NET_{LOCK,UNLOCK,ASSERT}_GIANT() macros, which 2007-08-06 14:26:03 +00:00
kern_priv.c Continue kernel privilege cleanup for 7.0: unstaticize suser_enabled and 2007-07-02 14:03:29 +00:00
kern_proc.c Test that p_textvp is non-NULL be dereferencing, as no executable vnode is 2007-11-20 18:03:09 +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 - Use ruxagg() in calcru() to make sure we have current tick information 2007-07-17 01:08:09 +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 Simplify the adaptive spinning algorithm in rwlock and mutex: 2007-11-26 22:37:35 +00:00
kern_sema.c
kern_shutdown.c Introduce a way to make pure kernal threads. 2007-10-26 08:00:41 +00:00
kern_sig.c Fix for the panic("vm_thread_new: kstack allocation failed") and 2007-11-05 11:36:16 +00:00
kern_subr.c Commit 14/14 of sched_lock decomposition. 2007-06-05 00:00:57 +00:00
kern_switch.c generally we are interested in what thread did something as 2007-11-14 06:21:24 +00:00
kern_sx.c Expand lock class with the "virtual" function lc_assert which will offer 2007-11-18 14:43:53 +00:00
kern_synch.c A bunch more files that should probably print out a thread name 2007-11-14 06:51:33 +00:00
kern_syscalls.c Make system call modules a bit more robust: 2006-08-01 16:32:20 +00:00
kern_sysctl.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
kern_tc.c Despite several examples in the kernel, the third argument of 2007-06-04 18:25:08 +00:00
kern_thr.c This time REALLY copy the name from the proc to the thread as a default. 2007-11-15 06:35:26 +00:00
kern_thread.c - Adds event handlers for process_ctor,process_dtor, process_init, 2007-11-15 14:20:07 +00:00
kern_time.c rufetch and calcru sometimes should be called atomically together. 2007-06-09 21:48:44 +00:00
kern_timeout.c Cache the value of c_lock as it can change, in the struct, 2007-11-22 12:15:54 +00:00
kern_umtx.c Add function UMTX_OP_WAIT_UINT, the function causes thread to wait for 2007-11-21 04:21:02 +00:00
kern_uuid.c Correct typo. 2007-04-23 12:53:00 +00:00
kern_xxx.c Further system call comment cleanup: 2007-03-05 13:10:58 +00:00
ksched.c Commit 14/14 of sched_lock decomposition. 2007-06-05 00:00:57 +00:00
link_elf_obj.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
link_elf.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
linker_if.m Add a function to list symbols in a file and their values at the 2007-11-18 00:23:31 +00:00
Make.tags.inc Remove netkey directory from cscope/TAGs generation and replace 2007-07-05 08:55:14 +00:00
Makefile - Remove UMAP filesystem. It was disconnected from build three years ago, 2007-06-25 05:06:57 +00:00
makesyscalls.sh Add support for COMPAT6 syscalls. 2007-07-04 22:38:28 +00:00
md4c.c
md5c.c
p1003_1b.c generally we are interested in what thread did something as 2007-11-14 06:21:24 +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 generally we are interested in what thread did something as 2007-11-14 06:21:24 +00:00
sched_ule.c generally we are interested in what thread did something as 2007-11-14 06:21:24 +00:00
serdev_if.m
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 Add a mutex to protect the list of interrupt config hooks. We do assume 2006-07-19 18:53:56 +00:00
subr_blist.c
subr_bus.c First in a series of changes to remove the now-unused Giant compatibility 2007-07-27 11:59:57 +00:00
subr_clist.c
subr_clock.c If clock_ct_to_ts fails to convert time time from the real time clock, 2007-07-23 09:42:32 +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
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 Cleanup and document the implementation of firmware(9) based on 2007-02-15 17:21:31 +00:00
subr_hints.c Use a sleep mutex instead of an sx lock for the kernel environment. This 2006-07-09 21:42:58 +00:00
subr_kdb.c - Move all of the PS_ flags into either p_flag or td_flags. 2007-09-17 05:31:39 +00:00
subr_kobj.c
subr_lock.c Initial checkin for rmlock (read mostly lock) a multi reader single writer 2007-11-08 14:47:55 +00:00
subr_log.c
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
subr_module.c
subr_msgbuf.c
subr_param.c Export maxswzone, maxbcache, maxtsiz, dfldsiz, maxdsiz, dflssiz, maxssiz, 2007-10-16 10:40:53 +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 Commit 14/14 of sched_lock decomposition. 2007-06-05 00:00:57 +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 Use utc_offset() where applicable, and hide the internals of it 2006-10-02 18:23:37 +00:00
subr_sbuf.c
subr_scanf.c
subr_sleepqueue.c A bunch more files that should probably print out a thread name 2007-11-14 06:51:33 +00:00
subr_smp.c Initial checkin for rmlock (read mostly lock) a multi reader single writer 2007-11-08 14:47:55 +00:00
subr_stack.c
subr_taskqueue.c Rename the kthread_xxx (e.g. kthread_create()) calls 2007-10-20 23:23:23 +00:00
subr_trap.c A bunch more files that should probably print out a thread name 2007-11-14 06:51:33 +00:00
subr_turnstile.c generally we are interested in what thread did something as 2007-11-14 06:21:24 +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 Fix the spinlock static table adding missing spinlocks. 2007-11-24 04:32:32 +00:00
sys_generic.c generally we are interested in what thread did something as 2007-11-14 06:21:24 +00:00
sys_pipe.c The kernel uses two ways to write data on a pipe: 2007-11-19 15:05:20 +00:00
sys_process.c Use VM_FAULT_DIRTY to fault in pages for write access in 2007-11-08 19:35:36 +00:00
sys_socket.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
syscalls.c Regenerate. 2007-08-16 05:32:26 +00:00
syscalls.master Put comments about syscalls by the correct ones, and use the correct syscall 2007-10-19 19:17:53 +00:00
systrace_args.c Regenerate. 2007-08-16 05:32:26 +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 Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
sysv_shm.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
tty_compat.c
tty_conf.c
tty_cons.c Revert UF_OPENING workaround for CURRENT. 2007-05-31 11:51:53 +00:00
tty_pts.c Fix bad function type passed to destroy_dev_sched_cb(). 2007-07-05 05:54:47 +00:00
tty_pty.c Bump up the number of ttys supported by pty(4) to 512 by making use of 2007-11-19 20:49:42 +00:00
tty_subr.c
tty_tty.c Lock Giant and proctree lock around dereferencing p_session->s_ttyvp->v_rdev. 2007-07-03 17:46:37 +00:00
tty.c ttyfree() frees the cdev(). But if there are pending kevents, 2007-07-20 09:41:54 +00:00
uipc_accf.c
uipc_cow.c
uipc_debug.c sblock() implements a sleep lock by interlocking SB_WANT and SB_LOCK flags 2007-05-03 14:42:42 +00:00
uipc_domain.c Remove the now-unused NET_{LOCK,UNLOCK,ASSERT}_GIANT() macros, which 2007-08-06 14:26:03 +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 This patch adds an M_NOFREE flag which allows one to mark an mbuf as 2007-10-06 21:42:39 +00:00
uipc_mqueue.c Eliminate now-unused SUSER_ALLOWJAIL arguments to priv_check_cred(); in 2007-06-12 00:12:01 +00:00
uipc_sem.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
uipc_sockbuf.c Set the NFS server sockbuf high watermarks to the system defaults 2007-10-12 03:56:27 +00:00
uipc_socket.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
uipc_syscalls.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
uipc_usrreq.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
vfs_acl.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
vfs_aio.c Rename the kthread_xxx (e.g. kthread_create()) calls 2007-10-20 23:23:23 +00:00
vfs_bio.c Rename the kthread_xxx (e.g. kthread_create()) calls 2007-10-20 23:23:23 +00:00
vfs_cache.c Remove remaining Giant acquisition around vn_fullpath1. This was missed 2007-11-22 21:26:25 +00:00
vfs_cluster.c - Move rusage from being per-process in struct pstats to per-thread in 2007-06-01 01:12:45 +00:00
vfs_default.c Since renaming of vop_lock to _vop_lock, pre- and post-condition 2007-05-18 13:02:13 +00:00
vfs_export.c Move vnode-to-file-handle translation from vfs_vptofh to vop_vptofh method. 2007-02-15 22:08:35 +00:00
vfs_extattr.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
vfs_hash.c Make insmntque() externally visibile and allow it to fail (e.g. during 2007-03-13 01:50:27 +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 Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
vfs_mount.c In nmount(), if MNT_ROOT is in the mount flags, filter it 2007-10-27 15:59:18 +00:00
vfs_subr.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
vfs_syscalls.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
vfs_vnops.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
vnode_if.src Revert UF_OPENING workaround for CURRENT. 2007-05-31 11:51:53 +00:00