From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yuyang Du Subject: [RFC PATCH 12/16 v3] Bias select wakee than waker in WAKE_AFFINE Date: Fri, 30 May 2014 14:36:08 +0800 Message-ID: <1401431772-14320-13-git-send-email-yuyang.du@intel.com> References: <1401431772-14320-1-git-send-email-yuyang.du@intel.com> Return-path: In-Reply-To: <1401431772-14320-1-git-send-email-yuyang.du@intel.com> Sender: linux-kernel-owner@vger.kernel.org To: mingo@redhat.com, peterz@infradead.org, rafael.j.wysocki@intel.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: arjan.van.de.ven@intel.com, len.brown@intel.com, alan.cox@intel.com, mark.gross@intel.com, pjt@google.com, bsegall@google.com, morten.rasmussen@arm.com, vincent.guittot@linaro.org, rajeev.d.muralidhar@intel.com, vishwesh.m.rudramuni@intel.com, nicole.chalhoub@intel.com, ajaya.durg@intel.com, harinarayanan.seshadri@intel.com, jacob.jun.pan@linux.intel.com, fengguang.wu@intel.com, yuyang.du@intel.com List-Id: linux-pm@vger.kernel.org In WAKE_AFFINE, we do not simply select idle, but bias wakee than waker if the cc of the wakee and waker (in this order) is capable of handling the wakee task Signed-off-by: Yuyang Du --- kernel/sched/fair.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 0c188df..d40ec9e 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4370,7 +4370,18 @@ static int select_idle_sibling(struct task_struct *p, int target) struct sched_group *sg; int i = task_cpu(p); - if (idle_cpu(target)) + /* + * we do not select idle, if the cc of the wakee and + * waker (in this order) is capable of handling the wakee task + */ + if (sysctl_sched_cc_wakeup_threshold) { + if (idle_cpu(i) || cpu_cc_capable(i)) + return i; + + if (i != target && (idle_cpu(target) || cpu_cc_capable(target))) + return target; + } + else if (idle_cpu(target)) return target; /* -- 1.7.9.5