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5f920fbee1
mirror_zfs/include/sys
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Brian Behlendorf 5f920fbee1 Retire MUTEX_OWNER checks 
To minimize the size of a kmutex_t a MUTEX_OWNER check was added.
It allowed the kmutex_t wrapper to leverage the mutex owner which was
already stored in the mutex for certain kernel configurations.

The upside to this was that it reduced the size of the kmutex_t wrapper
structure by the size of a task_struct pointer (4/8 bytes).  The
downside was that two mutex implementations needed to be maintained.
Depending on your exact kernel configuration the correct one would
be selected.

Over the years this solution worked but it could be fragile since it
depending heavily on assumed kernel mutex implementation details.  For
example the SPL_AC_MUTEX_OWNER_TASK_STRUCT configure check needed to
be added when the kernel changed how the owner was stored.  It also
made the code more complicated than it needed to be.

Therefore, in the name of simplicity and portability this optimization
is being retired.  It will slightly increase the memory requirements
for a kmutex_t but only very slightly.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Issue #435
2015-03-03 10:13:33 -08:00
..
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
acl_impl.h Refresh links to web site 2013-03-04 19:09:34 -08:00
acl.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 Emulate illumos interface cv_timedwait_hires() 2013-11-04 09:49:24 -08:00
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 Retire legacy debugging infrastructure 2014-11-19 10:35:07 -08:00
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_cache.h Use __get_free_pages() for emergency objects 2015-01-16 13:58:11 -08:00
kmem.h Add hooks for disabling direct reclaim 2015-01-16 13:55:09 -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
Makefile.am Refactor existing code 2015-01-16 13:55:08 -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 Retire MUTEX_OWNER checks 2015-03-03 10:13:33 -08:00
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 Refresh links to web site 2013-03-04 19:09:34 -08:00
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 Map highbit64() to fls64() 2014-10-17 15:11:50 -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 Refresh links to web site 2013-03-04 19:09:34 -08:00
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
types32.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
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
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_opreg.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
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 Cleanup vn_rename() and vn_remove() 2014-08-13 16:25:44 -07:00
zmod.h Refresh links to web site 2013-03-04 19:09:34 -08:00
zone.h Refresh links to web site 2013-03-04 19:09:34 -08:00