kernel_optimize_test/include
Peter Zijlstra dc61b1d65e sched: Fix PROVE_RCU vs cpu_cgroup
PROVE_RCU has a few issues with the cpu_cgroup because the scheduler
typically holds rq->lock around the css rcu derefs but the generic
cgroup code doesn't (and can't) know about that lock.

Provide means to add extra checks to the css dereference and use that
in the scheduler to annotate its users.

The addition of rq->lock to these checks is correct because the
cgroup_subsys::attach() method takes the rq->lock for each task it
moves, therefore by holding that lock, we ensure the task is pinned to
the current cgroup and the RCU derefence is valid.

That leaves one genuine race in __sched_setscheduler() where we used
task_group() without holding any of the required locks and thus raced
with the cgroup code. Solve this by moving the check under the
appropriate lock.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-06-08 18:44:04 +02:00
..
acpi Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2010-05-28 14:42:18 -07:00
asm-generic Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
crypto
drm Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2010-06-03 07:19:45 -07:00
keys
linux sched: Fix PROVE_RCU vs cpu_cgroup 2010-06-08 18:44:04 +02:00
math-emu
media V4L/DVB: saa7134: add RM-K6 remote control support for Avermedia M135A 2010-06-01 01:22:09 -03:00
mtd
net net: check for refcount if pop a stacked dst_entry 2010-06-04 15:56:00 -07:00
pcmcia
rdma
rxrpc
scsi SCSI: implement sd_unlock_native_capacity() 2010-06-02 13:50:04 -04:00
sound
trace Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-06-03 15:47:51 -07:00
video
xen
Kbuild