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Date: Thu, 25 Aug 2022 14:27:22 +0200 From: Vincent Guittot <vincent.guittot@...aro.org> To: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com, dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com, linux-kernel@...r.kernel.org Cc: zhangqiao22@...wei.com, Vincent Guittot <vincent.guittot@...aro.org> Subject: [PATCH 0/4] sched/fair: fixes in presence of lot of sched_idle tasks This patchset gathers somes cleanups but also improvements and fixes for scheduling UCs that involved a lot of sched_idle tasks. In such case, the sched_idle tasks impact significantly the behavior of other tasks whereas they should not. These patches don't impact other "normal" UCs. have foudn these changes while studying Zhang's problem [1] but AFAICT, these patches don't fix his problem. [1] https://lore.kernel.org/lkml/20220810015636.3865248-1-zhangsong34@huawei.com/ Vincent Guittot (4): sched/fair: make sure to try to detach at least one movable task sched/fair: cleanup loop_max and loop_break sched/fair: move call to list_last_entry() in detach_tasks sched/fair: limit sched slice duration kernel/sched/core.c | 6 +----- kernel/sched/fair.c | 29 +++++++++++++++++------------ kernel/sched/sched.h | 6 ++++++ 3 files changed, 24 insertions(+), 17 deletions(-) -- 2.17.1
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