From: Gregory Haskins Date: Mon, 29 Dec 2008 14:39:52 +0000 (-0500) Subject: sched: add sched_class->needs_post_schedule() member X-Git-Tag: v2.6.30-rc1~658^2~24^2~3^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=967fc04671feea4dbf780c9e55a0bc8fcf68a14e;p=pandora-kernel.git sched: add sched_class->needs_post_schedule() member We currently run class->post_schedule() outside of the rq->lock, which means that we need to test for the need to post_schedule outside of the lock to avoid a forced reacquistion. This is currently not a problem as we only look at rq->rt.overloaded. However, we want to enhance this going forward to look at more state to reduce the need to post_schedule to a bare minimum set. Therefore, we introduce a new member-func called needs_post_schedule() which tests for the post_schedule condtion without actually performing the work. Therefore it is safe to call this function before the rq->lock is released, because we are guaranteed not to drop the lock at an intermediate point (such as what post_schedule() may do). We will use this later in the series [ rostedt: removed paranoid BUG_ON ] Signed-off-by: Gregory Haskins --- Reading git-diff-tree failed