From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx134.postini.com [74.125.245.134]) by kanga.kvack.org (Postfix) with SMTP id AFF516B0032 for ; Thu, 27 Jun 2013 10:55:04 -0400 (EDT) Date: Thu, 27 Jun 2013 16:54:58 +0200 From: Peter Zijlstra Subject: Re: [PATCH 6/8] sched: Reschedule task on preferred NUMA node once selected Message-ID: <20130627145458.GU28407@twins.programming.kicks-ass.net> References: <1372257487-9749-1-git-send-email-mgorman@suse.de> <1372257487-9749-7-git-send-email-mgorman@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1372257487-9749-7-git-send-email-mgorman@suse.de> Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: Ingo Molnar , Andrea Arcangeli , Johannes Weiner , Linux-MM , LKML On Wed, Jun 26, 2013 at 03:38:05PM +0100, Mel Gorman wrote: > +static int > +find_idlest_cpu_node(int this_cpu, int nid) > +{ > + unsigned long load, min_load = ULONG_MAX; > + int i, idlest_cpu = this_cpu; > + > + BUG_ON(cpu_to_node(this_cpu) == nid); > + > + for_each_cpu(i, cpumask_of_node(nid)) { > + load = weighted_cpuload(i); > + > + if (load < min_load) { > + struct task_struct *p; > + > + /* Do not preempt a task running on its preferred node */ > + struct rq *rq = cpu_rq(i); > + local_irq_disable(); > + raw_spin_lock(&rq->lock); raw_spin_lock_irq() ? > + p = rq->curr; > + if (p->numa_preferred_nid != nid) { > + min_load = load; > + idlest_cpu = i; > + } > + raw_spin_unlock(&rq->lock); > + local_irq_disable(); > + } > + } > + > + return idlest_cpu; > +} -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org