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authorOleg Nesterov <oleg@redhat.com>2010-03-15 10:10:27 +0100
committerIngo Molnar <mingo@elte.hu>2010-04-02 20:12:03 +0200
commit9084bb8246ea935b98320554229e2f371f7f52fa (patch)
tree8478d18125e3b4a7e0a31d702647dee1830d23ef /kernel/sched_rt.c
parent6a1bdc1b577ebcb65f6603c57f8347309bc4ab13 (diff)
sched: Make select_fallback_rq() cpuset friendly
Introduce cpuset_cpus_allowed_fallback() helper to fix the cpuset problems with select_fallback_rq(). It can be called from any context and can't use any cpuset locks including task_lock(). It is called when the task doesn't have online cpus in ->cpus_allowed but ttwu/etc must be able to find a suitable cpu. I am not proud of this patch. Everything which needs such a fat comment can't be good even if correct. But I'd prefer to not change the locking rules in the code I hardly understand, and in any case I believe this simple change make the code much more correct compared to deadlocks we currently have. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20100315091027.GA9155@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_rt.c')
0 files changed, 0 insertions, 0 deletions