linux-kernel - Re: [PATCH 0/2] Fix nohz

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Message-ID: <1823b6fd-037f-38dc-2d33-0879d77768c3@bytedance.com>
Date:   Wed, 6 Sep 2023 14:45:39 +0800
From:   Hao Jia <jiahao.os@...edance.com>
To:     mingo@...hat.com, peterz@...radead.org, mingo@...nel.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,
        pauld@...hat.com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Fix nohz_full vs rt bandwidth


Friendly ping...

On 2023/8/21 Hao Jia wrote:
> Since the commit 88c56cfeaec4 ("sched/fair: Block nohz tick_stop
> when cfs bandwidth in use") was merged, it handles conflicts between
> NOHZ full and cfs_bandwidth well, and the scheduler feature HZ_BW
> allows us to choose which one to prefer.
> 
> This conflict also exists between NOHZ full and rt_bandwidth,
> these two patches try to handle it in a similar way.
> 
> patch1: Extracts a can_stop_tick() callback function for each
> sched_class from sched_can_stop_tick(), it will make things clearer
> and also convenient to handle the conflict between NOHZ full
> and rt_bandwidth.
> 
> patch2: If the HZ_BW scheduler feature is enabled, and the RT task
> to be run is constrained by rt_bandwidth runtime. Then it will
> prevent NO_HZ full from stopping tick.
> 
> Hao Jia (2):
>    sched/core: Introduce sched_class::can_stop_tick()
>    sched/rt: Block nohz tick_stop when rt bandwidth in use
> 
>   kernel/sched/core.c     | 67 +++++--------------------------
>   kernel/sched/deadline.c | 16 ++++++++
>   kernel/sched/fair.c     | 56 +++++++++++++++++++++++---
>   kernel/sched/rt.c       | 89 ++++++++++++++++++++++++++++++++++++++++-
>   kernel/sched/sched.h    |  5 ++-
>   5 files changed, 168 insertions(+), 65 deletions(-)
>