sched: Drop rq->lock from sched_exec()
authorPeter Zijlstra <a.p.zijlstra@chello.nl>
Tue, 5 Apr 2011 15:23:53 +0000 (17:23 +0200)
committerIngo Molnar <mingo@elte.hu>
Thu, 14 Apr 2011 06:52:39 +0000 (08:52 +0200)
commit8f42ced974df7d5af2de4cf5ea21fe978c7e4478
tree514ee978491dc62ee727308be1f228987c47eb54
parentab2515c4b98f7bc4fa11cad9fa0f811d63a72a26
sched: Drop rq->lock from sched_exec()

Since we can now call select_task_rq() and set_task_cpu() with only
p->pi_lock held, and sched_exec() load-balancing has always been
optimistic, drop all rq->lock usage.

Oleg also noted that need_migrate_task() will always be true for
current, so don't bother calling that at all.

Reviewed-by: Frank Rowand <frank.rowand@am.sony.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110405152729.314204889@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/sched.c