From: Ingo Molnar Date: Thu, 1 Mar 2007 04:13:42 +0000 (-0800) Subject: [PATCH] sched: fix SMT scheduler bug X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7355690ead6d61f6344072ae61060f985060da29;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git [PATCH] sched: fix SMT scheduler bug The SMT scheduler incorrectly skips kernel threads even if they are runnable (but they are preempted by a higher-prio user-space task which got SMT-delayed by an even higher-priority task running on a sibling CPU). Fix this for now by only doing the SMT-nice optimization if the to-be-delayed task is the only runnable task. (This should cover most of the real-life cases anyway.) This bug has been in the SMT scheduler since 2.6.17 or so, but has only been noticed now by the active check in the dynticks code. Signed-off-by: Ingo Molnar Cc: Michal Piotrowski Cc: Nick Piggin Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/kernel/sched.c b/kernel/sched.c index 0c5ebf59b8bc..5f102e6c7a4c 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3547,7 +3547,7 @@ need_resched_nonpreemptible: } } next->sleep_type = SLEEP_NORMAL; - if (dependent_sleeper(cpu, rq, next)) + if (rq->nr_running == 1 && dependent_sleeper(cpu, rq, next)) next = rq->idle; switch_tasks: if (next == rq->idle)