Ping Peter, this patch is collected into this patchset https://lkml.org/lkml/2015/4/6/44 On Fri, Mar 27, 2015 at 07:03:00AM +0800, Wanpeng Li wrote: >Ping Juri, ;) >On Mon, Mar 23, 2015 at 05:02:13PM +0800, Wanpeng Li wrote: >>This patch adds checks that prevents futile attempts to move dl tasks to >>a CPU with active tasks of equal or earlier deadline. The same behavior as >>commit 80e3d87b2c55 ("sched/rt: Reduce rq lock contention by eliminating >>locking of non-feasible target") for rt class. >> >>Signed-off-by: Wanpeng Li <wanpeng...@linux.intel.com> >>--- >>v1 -> v2: >> * use dl_time_before macro >> >> kernel/sched/deadline.c | 4 +++- >> 1 file changed, 3 insertions(+), 1 deletion(-) >> >>diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c >>index 19d716e..f48d319 100644 >>--- a/kernel/sched/deadline.c >>+++ b/kernel/sched/deadline.c >>@@ -955,7 +955,9 @@ select_task_rq_dl(struct task_struct *p, int cpu, int >>sd_flag, int flags) >> (p->nr_cpus_allowed > 1)) { >> int target = find_later_rq(p); >> >>- if (target != -1) >>+ if (target != -1 && >>+ dl_time_before(p->dl.deadline, >>+ cpu_rq(target)->dl.earliest_dl.curr)) >> cpu = target; >> } >> rcu_read_unlock(); >>-- >>1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
