Hi,
On 04/25/2013 07:23 PM, Vincent Guittot wrote:
Periodically updates the buddy of a CPU according to the current activity of the system. A CPU is its own buddy if it participates to the packing effort. Otherwise, it points to a CPU that participates to the packing effort.
Signed-off-by: Vincent Guittot vincent.guittot@linaro.org
kernel/sched/fair.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 86 insertions(+), 5 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 234ecdd..28f8ea7 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -174,11 +174,17 @@ void sched_init_granularity(void) #ifdef CONFIG_SMP +static unsigned long power_of(int cpu) +{
- return cpu_rq(cpu)->cpu_power;
+}
/*
- Save the id of the optimal CPU that should be used to pack small tasks
- The value -1 is used when no buddy has been found
*/ DEFINE_PER_CPU(int, sd_pack_buddy); +DEFINE_PER_CPU(struct sched_domain *, sd_pack_domain); /*
- Look for the best buddy CPU that can be used to pack small tasks
@@ -237,6 +243,68 @@ void update_packing_domain(int cpu) } pr_debug("CPU%d packing on CPU%d\n", cpu, id);
- per_cpu(sd_pack_domain, cpu) = sd;
- per_cpu(sd_pack_buddy, cpu) = id;
+}
+void update_packing_buddy(int cpu, int activity) +{
- struct sched_domain *sd = per_cpu(sd_pack_domain, cpu);
- struct sched_group *sg, *pack, *tmp;
- int id = cpu;
- if (!sd)
return;- /*
* The sched_domain of a CPU points on the local sched_group* and this CPU of this local group is a good candidate*/- pack = sg = sd->groups;
- /* loop the sched groups to find the best one */
- for (tmp = sg->next; tmp != sg; tmp = tmp->next) {
if ((tmp->sgp->power * pack->group_weight) >(pack->sgp->power_available * tmp->group_weight))
The power_available struct member is defined in a subsequent patch (12/14), so this patch series would break git bisect.
-- Francesco