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| author | Oleg Nesterov <oleg@redhat.com> | 2010-03-15 10:10:27 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-04-02 20:12:03 +0200 |
| commit | 9084bb8246ea935b98320554229e2f371f7f52fa (patch) | |
| tree | 8478d18125e3b4a7e0a31d702647dee1830d23ef /fs | |
| parent | 6a1bdc1b577ebcb65f6603c57f8347309bc4ab13 (diff) | |
| download | op-kernel-dev-9084bb8246ea935b98320554229e2f371f7f52fa.zip op-kernel-dev-9084bb8246ea935b98320554229e2f371f7f52fa.tar.gz | |
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 'fs')
0 files changed, 0 insertions, 0 deletions
