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Brian Behlendorf f7a973d99b Add TASKQ_DYNAMIC feature 
Setting the TASKQ_DYNAMIC flag will create a taskq with dynamic
semantics.  Initially only a single worker thread will be created
to service tasks dispatched to the queue.  As additional threads
are needed they will be dynamically spawned up to the max number
specified by 'nthreads'.  When the threads are no longer needed,
because the taskq is empty, they will automatically terminate.

Due to the low cost of creating and destroying threads under Linux
by default new threads and spawned and terminated aggressively.
There are two modules options which can be tuned to adjust this
behavior if needed.

* spl_taskq_thread_sequential - The number of sequential tasks,
without interruption, which needed to be handled by a worker
thread before a new worker thread is spawned.  Default 4.

* spl_taskq_thread_dynamic - Provides the ability to completely
disable the use of dynamic taskqs on the system.  This is provided
for the purposes of debugging and troubleshooting.  Default 1
(enabled).

This behavior is fundamentally consistent with the dynamic taskq
implementation found in both illumos and FreeBSD.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Closes #458
 		2015-06-24 15:14:18 -07:00
..
fm Kernel header installation should respect --prefix 2014-10-28 09:31:48 -07:00
fs Kernel header installation should respect --prefix 2014-10-28 09:31:48 -07:00
sysevent Kernel header installation should respect --prefix 2014-10-28 09:31:48 -07:00
Makefile.am Implement areleasef() 2015-04-24 13:02:37 -07:00
acl.h Refresh links to web site 2013-03-04 19:09:34 -08:00
acl_impl.h Refresh links to web site 2013-03-04 19:09:34 -08:00
atomic.h Remove atomic64_xchg() wrappers 2014-10-17 15:11:50 -07:00
attr.h Refresh links to web site 2013-03-04 19:09:34 -08:00
bitmap.h Refresh links to web site 2013-03-04 19:09:34 -08:00
bootconf.h Refresh links to web site 2013-03-04 19:09:34 -08:00
bootprops.h Refresh links to web site 2013-03-04 19:09:34 -08:00
buf.h Refresh links to web site 2013-03-04 19:09:34 -08:00
byteorder.h Refresh links to web site 2013-03-04 19:09:34 -08:00
callb.h Refresh links to web site 2013-03-04 19:09:34 -08:00
callo.h Emulate illumos interface cv_timedwait_hires() 2013-11-04 09:49:24 -08:00
cmn_err.h Refresh links to web site 2013-03-04 19:09:34 -08:00
compress.h Refresh links to web site 2013-03-04 19:09:34 -08:00
condvar.h Rename cv_wait_interruptible() to cv_wait_sig() 2015-06-10 16:36:12 -07:00
conf.h Refresh links to web site 2013-03-04 19:09:34 -08:00
console.h Refresh links to web site 2013-03-04 19:09:34 -08:00
cpupart.h Refresh links to web site 2013-03-04 19:09:34 -08:00
cpuvar.h Refresh links to web site 2013-03-04 19:09:34 -08:00
crc32.h Refresh links to web site 2013-03-04 19:09:34 -08:00
cred.h Remove credential configure checks. 2014-10-17 15:11:51 -07:00
ctype.h Refresh links to web site 2013-03-04 19:09:34 -08:00
ddi.h Refresh links to web site 2013-03-04 19:09:34 -08:00
debug.h Add IMPLY() and EQUIV() macros 2015-06-24 14:44:47 -07:00
dirent.h Refresh links to web site 2013-03-04 19:09:34 -08:00
disp.h Add kpreempt() compatibility macro 2013-10-09 13:52:55 -07:00
dkio.h Refresh links to web site 2013-03-04 19:09:34 -08:00
dklabel.h Refresh links to web site 2013-03-04 19:09:34 -08:00
dnlc.h Remove shrink_{i,d}node_cache() wrappers 2014-10-17 15:11:51 -07:00
dumphdr.h Refresh links to web site 2013-03-04 19:09:34 -08:00
efi_partition.h Refresh links to web site 2013-03-04 19:09:34 -08:00
errno.h Refresh links to web site 2013-03-04 19:09:34 -08:00
extdirent.h Refresh links to web site 2013-03-04 19:09:34 -08:00
fcntl.h Refresh links to web site 2013-03-04 19:09:34 -08:00
file.h Refresh links to web site 2013-03-04 19:09:34 -08:00
idmap.h Refresh links to web site 2013-03-04 19:09:34 -08:00
int_limits.h Refresh links to web site 2013-03-04 19:09:34 -08:00
int_types.h Refresh links to web site 2013-03-04 19:09:34 -08:00
inttypes.h Refresh links to web site 2013-03-04 19:09:34 -08:00
isa_defs.h Add support for aarch64 (ARMv8) 2014-04-25 15:25:32 -07:00
kidmap.h Refresh links to web site 2013-03-04 19:09:34 -08:00
kmem.h Add hooks for disabling direct reclaim 2015-01-16 13:55:09 -08:00
kmem_cache.h Use __get_free_pages() for emergency objects 2015-01-16 13:58:11 -08:00
kobj.h Refresh links to web site 2013-03-04 19:09:34 -08:00
kstat.h 3537 add kstat_waitq_enter and friends 2013-10-25 13:41:52 -07:00
list.h Refresh links to web site 2013-03-04 19:09:34 -08:00
mkdev.h Refresh links to web site 2013-03-04 19:09:34 -08:00
mntent.h Refresh links to web site 2013-03-04 19:09:34 -08:00
modctl.h Refresh links to web site 2013-03-04 19:09:34 -08:00
mode.h Refresh links to web site 2013-03-04 19:09:34 -08:00
mount.h Refresh links to web site 2013-03-04 19:09:34 -08:00
mutex.h Don't allow shrinking a PF_FSTRANS context 2015-04-03 11:32:31 -07:00
note.h Refresh links to web site 2013-03-04 19:09:34 -08:00
open.h Refresh links to web site 2013-03-04 19:09:34 -08:00
param.h Refresh links to web site 2013-03-04 19:09:34 -08:00
pathname.h Refresh links to web site 2013-03-04 19:09:34 -08:00
policy.h Refresh links to web site 2013-03-04 19:09:34 -08:00
pool.h Refresh links to web site 2013-03-04 19:09:34 -08:00
priv_impl.h Refresh links to web site 2013-03-04 19:09:34 -08:00
proc.h Refresh links to web site 2013-03-04 19:09:34 -08:00
processor.h Refresh links to web site 2013-03-04 19:09:34 -08:00
pset.h Refresh links to web site 2013-03-04 19:09:34 -08:00
random.h Refresh links to web site 2013-03-04 19:09:34 -08:00
refstr.h Refresh links to web site 2013-03-04 19:09:34 -08:00
resource.h Refresh links to web site 2013-03-04 19:09:34 -08:00
rwlock.h Retire rwsem_is_locked() compat 2015-06-10 16:35:48 -07:00
sdt.h Define SET_ERROR() 2013-10-09 14:20:46 -07:00
sid.h Refresh links to web site 2013-03-04 19:09:34 -08:00
signal.h Refresh links to web site 2013-03-04 19:09:34 -08:00
stat.h Refresh links to web site 2013-03-04 19:09:34 -08:00
stropts.h Refresh links to web site 2013-03-04 19:09:34 -08:00
sunddi.h Update code to use misc_register()/misc_deregister() 2014-10-17 15:07:28 -07:00
sunldi.h Refresh links to web site 2013-03-04 19:09:34 -08:00
sysdc.h Refresh links to web site 2013-03-04 19:09:34 -08:00
sysevent.h Refresh links to web site 2013-03-04 19:09:34 -08:00
sysmacros.h Add boot_ncpus macro 2015-05-21 09:58:01 -07:00
systeminfo.h Simplify hostid logic 2014-04-14 09:04:41 -07:00
systm.h Refresh links to web site 2013-03-04 19:09:34 -08:00
t_lock.h Refresh links to web site 2013-03-04 19:09:34 -08:00
taskq.h Add TASKQ_DYNAMIC feature 2015-06-24 15:14:18 -07:00
thread.h De-inline spl_kthread_create(). 2014-04-09 19:17:12 -07:00
time.h Use current_kernel_time() in the time compatibility wrappers 2015-01-16 13:54:35 -08:00
timer.h Add ddi_time_after and friends 2014-04-14 09:32:01 -07:00
tsd.h Refresh links to web site 2013-03-04 19:09:34 -08:00
types.h Refactor existing code 2015-01-16 13:55:08 -08:00
types32.h Refresh links to web site 2013-03-04 19:09:34 -08:00
u8_textprep.h Refresh links to web site 2013-03-04 19:09:34 -08:00
uio.h Refresh links to web site 2013-03-04 19:09:34 -08:00
unistd.h Refresh links to web site 2013-03-04 19:09:34 -08:00
user.h Implement areleasef() 2015-04-24 13:02:37 -07:00
va_list.h Refresh links to web site 2013-03-04 19:09:34 -08:00
varargs.h Refresh links to web site 2013-03-04 19:09:34 -08:00
vfs.h Refresh links to web site 2013-03-04 19:09:34 -08:00
vfs_opreg.h Refresh links to web site 2013-03-04 19:09:34 -08:00
vmem.h Add hooks for disabling direct reclaim 2015-01-16 13:55:09 -08:00
vmsystm.h Refactor existing code 2015-01-16 13:55:08 -08:00
vnode.h Implement areleasef() 2015-04-24 13:02:37 -07:00
zmod.h Refresh links to web site 2013-03-04 19:09:34 -08:00
zone.h Add crgetzoneid() stub 2015-04-02 09:49:55 -07:00