Messages in this thread | | | From | Chengming Zhou <> | Subject | [PATCH 0/8] sched: task load tracking optimization and cleanup | Date | Sat, 9 Jul 2022 23:13:45 +0800 |
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Hi all,
This patch series is optimization and cleanup for task load tracking when task migrate CPU/cgroup or switched_from/to_fair().
There are three types of detach/attach_entity_load_avg (except fork and exit case) for a fair task: 1. task migrate CPU (on_rq migrate or wake_up migrate) 2. task migrate cgroup (detach then attach) 3. task switched_from/to_fair (detach later attach)
patch1 optimize the on_rq migrate CPU case by combine detach into dequeue, so we don't need to do detach_entity_cfs_rq() in migrate_task_rq_fair() any more.
patch3 cleanup the migrate cgroup case by remove cpu_cgrp_subsys->fork(), since we already do the same thing in sched_cgroup_fork().
patch1-3 have been reviewed earlier, but conflicts with the current tip tree, so include them here as a patchset. Sorry for the inconvenience.
patch5-6 fix load tracking for new forked !fair task and when task switched_from_fair().
After these changes, the task sched_avg last_update_time is reset to 0 when migrate from CPU/cgroup or switched_from_fair(), to save updated sched_avg for next attach.
patch7-8 delete superfluous set_task_rq_fair() and SKIP_AGE_LOAD.
Chengming Zhou (8): sched/fair: combine detach into dequeue when migrating task sched/fair: update comments in enqueue/dequeue_entity() sched/fair: remove redundant cpu_cgrp_subsys->fork() sched/fair: reset sched_avg last_update_time before set_task_rq() sched/fair: fix load tracking for new forked !fair task sched/fair: stop load tracking when task switched_from_fair() sched/fair: delete superfluous set_task_rq_fair() sched/fair: delete superfluous SKIP_AGE_LOAD
kernel/sched/core.c | 27 ++------ kernel/sched/fair.c | 139 ++++++++++------------------------------ kernel/sched/features.h | 1 - kernel/sched/sched.h | 14 +--- 4 files changed, 41 insertions(+), 140 deletions(-)
-- 2.36.1
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