linux-kernel - [tip:sched/numa] sched: Make find_busiest

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Date:	Sat, 19 May 2012 04:28:49 -0700
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, a.p.zijlstra@...llo.nl,
	pjt@...gle.com, cl@...ux.com, riel@...hat.com,
	akpm@...ux-foundation.org, bharata.rao@...il.com,
	aarcange@...hat.com, Lee.Schermerhorn@...com,
	suresh.b.siddha@...el.com, danms@...ibm.com, tglx@...utronix.de
Subject: [tip:sched/numa] sched: Make find_busiest_queue() a method

Commit-ID:  5197e11c4b2ec615d21569d4263781f23d25d4fc
Gitweb:     http://git.kernel.org/tip/5197e11c4b2ec615d21569d4263781f23d25d4fc
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Sat, 3 Mar 2012 16:56:25 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sat, 19 May 2012 12:52:19 +0200

sched: Make find_busiest_queue() a method

Its a bit awkward but it was the least painful means of modifying the
queue selection. Used in a later patch to conditionally use a random
queue.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
Cc: Paul Turner <pjt@...gle.com>
Cc: Dan Smith <danms@...ibm.com>
Cc: Bharata B Rao <bharata.rao@...il.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/n/tip-3n9wqw2rdmhtu7qjhpoegh7u@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 940e6d1..34a221c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3085,6 +3085,10 @@ struct lb_env {
 	unsigned int		loop;
 	unsigned int		loop_break;
 	unsigned int		loop_max;
+
+	struct rq *		(*find_busiest_queue)(struct lb_env *,
+						      struct sched_group *,
+						      const struct cpumask *);
 };
 
 /*
@@ -4221,11 +4225,12 @@ static int load_balance(int this_cpu, struct rq *this_rq,
 	struct cpumask *cpus = __get_cpu_var(load_balance_tmpmask);
 
 	struct lb_env env = {
-		.sd		= sd,
-		.dst_cpu	= this_cpu,
-		.dst_rq		= this_rq,
-		.idle		= idle,
-		.loop_break	= sched_nr_migrate_break,
+		.sd		    = sd,
+		.dst_cpu	    = this_cpu,
+		.dst_rq		    = this_rq,
+		.idle		    = idle,
+		.loop_break	    = sched_nr_migrate_break,
+		.find_busiest_queue = find_busiest_queue,
 	};
 
 	cpumask_copy(cpus, cpu_active_mask);
@@ -4243,7 +4248,7 @@ redo:
 		goto out_balanced;
 	}
 
-	busiest = find_busiest_queue(&env, group, cpus);
+	busiest = env.find_busiest_queue(&env, group, cpus);
 	if (!busiest) {
 		schedstat_inc(sd, lb_nobusyq[idle]);
 		goto out_balanced;
--
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