linux/arch
Jens Axboe abf137dd77 aio: make the lookup_ioctx() lockless
The mm->ioctx_list is currently protected by a reader-writer lock,
so we always grab that lock on the read side for doing ioctx
lookups. As the workload is extremely reader biased, turn this into
an rcu hlist so we can make lookup_ioctx() lockless. Get rid of
the rwlock and use a spinlock for providing update side exclusion.

There's usually only 1 entry on this list, so it doesn't make sense
to look into fancier data structures.

Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-12-29 08:29:50 +01:00
..
alpha Merge branch 'master' into next 2008-12-04 17:16:36 +11:00
arm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
avr32 avr32: favr-32 build fix 2008-12-18 16:22:13 +01:00
blackfin kbuild: use KECHO convenience echo 2008-12-03 21:32:01 +01:00
cris [CRIS] Remove links from CRIS build 2008-10-31 23:37:57 +01:00
frv frv: fix mmap2 error handling 2008-12-01 19:55:24 -08:00
h8300 Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/dvrabel/uwb 2008-10-23 08:20:34 -07:00
ia64 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
m32r Merge branch 'sched/urgent' into sched/core 2008-12-08 13:52:00 +01:00
m68k m68k: fix trigraph ignored warning in setox.S 2008-12-28 20:00:05 +01:00
m68knommu container freezer: implement freezer cgroup subsystem 2008-10-20 08:52:34 -07:00
mips Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-12-28 12:27:58 -08:00
mn10300 MN10300: Give correct size when reserving interrupt vector table 2008-12-10 13:34:33 -08:00
parisc Merge branch 'next' into for-linus 2008-12-25 11:40:09 +11:00
powerpc Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
s390 aio: make the lookup_ioctx() lockless 2008-12-29 08:29:50 +01:00
sh Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6 2008-12-28 12:33:21 -08:00
sparc Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
sparc64 Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-12-15 20:03:50 -08:00
um Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
x86 Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-next 2008-12-28 15:13:48 -08:00
xtensa xtensa: Kill directly reference of netdev->priv 2008-12-04 15:06:56 -08:00
.gitignore
Kconfig remove __ARCH_WANT_COMPAT_SYS_PTRACE 2008-11-30 11:00:15 -08:00