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Message-ID: <5217194B.2020209@linux.vnet.ibm.com>
Date: Fri, 23 Aug 2013 13:41:55 +0530
From: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To: Peter Zijlstra <peterz@...radead.org>
CC: Ingo Molnar <mingo@...nel.org>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
linux-kernel@...r.kernel.org, Mike Galbraith <efault@....de>,
Paul Turner <pjt@...gle.com>, Alex Shi <alex.shi@...el.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Morten Rasmussen <morten.rasmussen@....com>,
Namhyung Kim <namhyung@...nel.org>,
Lei Wen <leiwen@...vell.com>, Rik van Riel <riel@...riel.com>,
Joonsoo Kim <js1304@...il.com>
Subject: Re: [PATCH 07/10] sched, fair: Optimize find_busiest_queue()
Hi Peter,
On 08/19/2013 09:31 PM, Peter Zijlstra wrote:
In the load balancing code, looks to me that
cpumask_copy(cpus, cpu_active_mask) is not updating the env.cpus at all,
before calling find_busiest_group(). Am I missing something?
Should not cpumask_copy() below be before we update the env.cpus parameter?
static int load_balance(int this_cpu, struct rq *this_rq,
struct sched_domain *sd, enum cpu_idle_type idle,
int *balance)
{
int ld_moved, cur_ld_moved, active_balance = 0;
struct sched_group *group;
struct rq *busiest;
unsigned long flags;
struct cpumask *cpus = __get_cpu_var(load_balance_mask);
struct lb_env env = {
.sd = sd,
.dst_cpu = this_cpu,
.dst_rq = this_rq,
.dst_grpmask = sched_group_cpus(sd->groups),
.idle = idle,
.loop_break = sched_nr_migrate_break,
.cpus = cpus,
};
/*
* For NEWLY_IDLE load_balancing, we don't need to consider
* other cpus in our group
*/
if (idle == CPU_NEWLY_IDLE)
env.dst_grpmask = NULL;
cpumask_copy(cpus, cpu_active_mask);
schedstat_inc(sd, lb_count[idle]);
redo:
group = find_busiest_group(&env, balance);
Regards
Preeti U Murthy
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