Messages in this thread Patch in this message | | | From | Mel Gorman <> | Subject | [PATCH 09/13] sched/fair: Take into account runnable_avg to classify group | Date | Wed, 19 Feb 2020 13:54:38 +0000 |
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From: Vincent Guittot <vincent.guittot@linaro.org>
Take into account the new runnable_avg signal to classify a group and to mitigate the volatility of util_avg in face of intensive migration.
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> --- kernel/sched/fair.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 1feac09f9b22..3d5b8240a356 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7748,7 +7748,8 @@ struct sg_lb_stats { unsigned long avg_load; /*Avg load across the CPUs of the group */ unsigned long group_load; /* Total load over the CPUs of the group */ unsigned long group_capacity; - unsigned long group_util; /* Total utilization of the group */ + unsigned long group_util; /* Total utilization over the CPUs of the group */ + unsigned long group_runnable; /* Total runnable time over the CPUs of the group */ unsigned int sum_nr_running; /* Nr of tasks running in the group */ unsigned int sum_h_nr_running; /* Nr of CFS tasks running in the group */ unsigned int idle_cpus; @@ -7969,6 +7970,10 @@ group_has_capacity(unsigned int imbalance_pct, struct sg_lb_stats *sgs) if (sgs->sum_nr_running < sgs->group_weight) return true; + if ((sgs->group_capacity * imbalance_pct) < + (sgs->group_runnable * 100)) + return false; + if ((sgs->group_capacity * 100) > (sgs->group_util * imbalance_pct)) return true; @@ -7994,6 +7999,10 @@ group_is_overloaded(unsigned int imbalance_pct, struct sg_lb_stats *sgs) (sgs->group_util * imbalance_pct)) return true; + if ((sgs->group_capacity * imbalance_pct) < + (sgs->group_runnable * 100)) + return true; + return false; } @@ -8088,6 +8097,7 @@ static inline void update_sg_lb_stats(struct lb_env *env, sgs->group_load += cpu_load(rq); sgs->group_util += cpu_util(i); + sgs->group_runnable += cpu_runnable(rq); sgs->sum_h_nr_running += rq->cfs.h_nr_running; nr_running = rq->nr_running; -- 2.16.4
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