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Subject[PATCH 14/19] 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.

Cc: Paul Turner <pjt@google.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
kernel/sched/fair.c | 19 ++++++++++++-------
1 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 22321db..9c4164e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3074,6 +3074,10 @@ 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 *);
};

/*
@@ -4246,12 +4250,13 @@ 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,
- .dst_grpmask = sched_group_cpus(sd->groups),
- .idle = idle,
- .loop_break = sched_nr_migrate_break,
+ .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,
+ .find_busiest_queue = find_busiest_queue,
};

cpumask_copy(cpus, cpu_active_mask);
@@ -4270,7 +4275,7 @@ 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;
--
1.7.2.3




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