Messages in this thread | | | From | Dietmar Eggemann <> | Subject | [PATCH 0/7] sched: Remove per rq load array | Date | Mon, 27 May 2019 07:21:09 +0100 |
| |
Since commit fdf5f315d5cf "sched/fair: Disable LB_BIAS by default" (v4.20) the scheduler feature LB_BIAS is disabled, i.e. the scheduler has been only using rq->cpu_load[0] for the cpu load values since then.
Tests back then (result are listed in the header of the patch mentioned above) haven't shown any regressions and people haven't complained about any related problems in the meantime (v4.20 - v5.1).
The following patches remove all the functionality which is not needed anymore:
(1) Per rq load array update code (2) CFS' source_load() and target_load() used for conservative load balancing which can be directly replaced by weighted_cpuload() (3) Per rq load array (rq->cpu_load[]) (4) Sched domain per rq load indexes (sd->*_idx) since there is no other user for it (5) sum_weighted_load of sched group load balance stats because it's now identical with the actual sched group load
Dietmar Eggemann (7): sched: Remove rq->cpu_load[] update code sched/fair: Replace source_load() & target_load() w/ weighted_cpuload() sched/debug: Remove sd->*_idx range on sysctl sched: Remove rq->cpu_load[] sched: Remove sd->*_idx sched/fair: Remove sgs->sum_weighted_load sched/fair: Rename weighted_cpuload() to cpu_load()
include/linux/sched/nohz.h | 8 - include/linux/sched/topology.h | 5 - kernel/sched/core.c | 7 +- kernel/sched/debug.c | 41 +--- kernel/sched/fair.c | 385 ++------------------------------- kernel/sched/features.h | 1 - kernel/sched/sched.h | 8 - kernel/sched/topology.c | 10 - kernel/time/tick-sched.c | 2 - 9 files changed, 33 insertions(+), 434 deletions(-)
-- 2.17.1
| |