]> git.karo-electronics.de Git - karo-tx-linux.git/commit
sched/rt: Use root_domain of rt_rq not current processor
authorShawn Bohrer <sbohrer@rgmadvisors.com>
Mon, 14 Jan 2013 17:55:31 +0000 (11:55 -0600)
committerIngo Molnar <mingo@kernel.org>
Fri, 25 Jan 2013 07:20:47 +0000 (08:20 +0100)
commitaa7f67304d1a03180f463258aa6f15a8b434e77d
tree14c1f290447fb84483c0eeed81806835a07d73f8
parentff7532ca2c631e7e96dcd305a967b610259dc0ea
sched/rt: Use root_domain of rt_rq not current processor

When the system has multiple domains do_sched_rt_period_timer()
can run on any CPU and may iterate over all rt_rq in
cpu_online_mask.  This means when balance_runtime() is run for a
given rt_rq that rt_rq may be in a different rd than the current
processor.  Thus if we use smp_processor_id() to get rd in
do_balance_runtime() we may borrow runtime from a rt_rq that is
not part of our rd.

This changes do_balance_runtime to get the rd from the passed in
rt_rq ensuring that we borrow runtime only from the correct rd
for the given rt_rq.

This fixes a BUG at kernel/sched/rt.c:687! in __disable_runtime
when we try reclaim runtime lent to other rt_rq but runtime has
been lent to a rt_rq in another rd.

Signed-off-by: Shawn Bohrer <sbohrer@rgmadvisors.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Mike Galbraith <bitbucket@online.de>
Cc: peterz@infradead.org
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/r/1358186131-29494-1-git-send-email-sbohrer@rgmadvisors.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
kernel/sched/rt.c