[PATCH] Update cfq io scheduler to time sliced design

This updates the CFQ io scheduler to the new time sliced design (cfq
v3).  It provides full process fairness, while giving excellent
aggregate system throughput even for many competing processes.  It
supports io priorities, either inherited from the cpu nice value or set
directly with the ioprio_get/set syscalls.  The latter closely mimic
set/getpriority.

This import is based on my latest from -mm.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 3ebcd60a19c6..9d1b10ed0135 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -784,6 +784,8 @@ fastcall NORET_TYPE void do_exit(long code)
 
         profile_task_exit(tsk);
 
+        WARN_ON(atomic_read(&tsk->fs_excl));
+
         if (unlikely(in_interrupt()))
                 panic("Aiee, killing interrupt handler!");
         if (unlikely(!tsk->pid))