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

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Date:   Mon, 21 Aug 2023 17:49:25 +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, Hao Jia <jiahao.os@...edance.com>
Subject: [PATCH 0/2] Fix nohz_full vs rt bandwidth

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(-)

-- 
2.39.2