linux-kernel - [PATCH v2 0/2] sched/fair: optimize and simplify rq leaf_cfs_rq

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Message-Id: <20220526071354.6426-1-zhouchengming@bytedance.com>
Date:   Thu, 26 May 2022 15:13:52 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com, odin@...d.al
Cc:     linux-kernel@...r.kernel.org, duanxiongchun@...edance.com,
        songmuchun@...edance.com,
        Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH v2 0/2] sched/fair: optimize and simplify rq leaf_cfs_rq_list

Hi,

This v2 is based on [1], which try to not put cfs_rqs in throttled_hierarchy
on the rq leaf_cfs_rq_list, simplify the leaf_cfs_rq_list maintenance and
optimize the periodic load decay.

Vincent suggested moving throttled_hierarchy() outside list_add_leaf_cfs_rq()
because the task will not be added in this case which is quite misleading.

When do that moving in propagate_entity_cfs_rq(), I found it has problem
with propagation upwards. So add the fix in the first patch to be easier
to backport, please see the details in its commit message.

[1] https://lore.kernel.org/all/20220427160544.40309-1-zhouchengming@bytedance.com/

Chengming Zhou (2):
  sched/fair: fix propagate during synchronous attach/detach
  sched/fair: optimize and simplify rq leaf_cfs_rq_list

 kernel/sched/fair.c | 83 +++++++++++----------------------------------
 1 file changed, 20 insertions(+), 63 deletions(-)

-- 
2.36.1