lkml.org 
[lkml]   [2020]   [Feb]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 5/5] sched/fair: Take into account runnable_avg to classify group
Date
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 3b6a90d6315c..99249a2484b4 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7718,7 +7718,8 @@ 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;
@@ -7939,6 +7940,10 @@ 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;
@@ -7964,6 +7969,10 @@ 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;
}

@@ -8058,6 +8067,7 @@ 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;
--
2.17.1
\
 
 \ /
  Last update: 2020-02-14 16:28    [W:0.254 / U:13.404 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site