On Wed, Aug 06, 2014 at 12:06:27PM +0400, Kirill Tkhai wrote: > > Let's use ONRQ_MIGRATING instead.
I feel there should be a little more in the changelog; how about something like: Avoid double_rq_lock() and use ONRQ_MIGRATING for __migrate_task(). The advantage is (obviously) not holding two 'rq->lock's at the same time and thereby increasing parallelism. The important point to note is that because we acquire dst->lock immediately after releasing src->lock the potential wait time of task_rq_lock() callers on ONRQ_MIGRATING is not longer than it would have been in the double rq lock scenario. > Signed-off-by: Kirill Tkhai <ktk...@parallels.com>
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