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sched/fair: Provide update_sg_lb_stats() with sched domain statistics

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Before deciding to pull tasks when using asymmetric packing of tasks,
on some architectures (e.g., x86) it is necessary to know not only the
state of dst_cpu but also of its SMT siblings. The decision to classify
a candidate busiest group as group_asym_packing is done in
update_sg_lb_stats(). Give this function access to the scheduling domain
statistics, which contains the statistics of the local group.

Originally-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Len Brown <len.brown@intel.com>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20210911011819.12184-5-ricardo.neri-calderon@linux.intel.com
This commit is contained in:
Ricardo Neri 2021-09-10 18:18:17 -07:00 • committed by Peter Zijlstra
parent 6025643596
commit c0d14b57fe
1 changed files with 3 additions and 2 deletions
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5
kernel/sched/fair.c
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@ -8579,6 +8579,7 @@ group_type group_classify(unsigned int imbalance_pct,
* @sg_status: Holds flag indicating the status of the sched_group
*/
static inline void update_sg_lb_stats(struct lb_env *env,
struct sd_lb_stats *sds,
struct sched_group *group,
struct sg_lb_stats *sgs,
int *sg_status)
@ -8587,7 +8588,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
memset(sgs, 0, sizeof(*sgs));
local_group = cpumask_test_cpu(env->dst_cpu, sched_group_span(group));
local_group = group == sds->local;
for_each_cpu_and(i, sched_group_span(group), env->cpus) {
struct rq *rq = cpu_rq(i);
@ -9150,7 +9151,7 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd
update_group_capacity(env->sd, env->dst_cpu);
}
update_sg_lb_stats(env, sg, sgs, &sg_status);
update_sg_lb_stats(env, sds, sg, sgs, &sg_status);
if (local_group)
goto next_group;