linux-kernel - [PATCH 0/6] Backport rework of deadline bandwidth restoration for 5.10.y

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Message-Id: <20230820152144.517461-1-qyousef@layalina.io>
Date:   Sun, 20 Aug 2023 16:21:38 +0100
From:   Qais Yousef <qyousef@...alina.io>
To:     stable@...r.kernel.org
Cc:     Juri Lelli <juri.lelli@...hat.com>,
        Waiman Long <longman@...hat.com>, Tejun Heo <tj@...nel.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Ingo Molnar <mingo@...nel.org>, Hao Luo <haoluo@...gle.com>,
        John Stultz <jstultz@...gle.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, Qais Yousef <qyousef@...alina.io>
Subject: [PATCH 0/6] Backport rework of deadline bandwidth restoration for 5.10.y

This is a backport of the series that fixes the way deadline bandwidth
restoration is done which is causing noticeable delay on resume path. It also
converts the cpuset lock back into a mutex which some users on Android too.
I lack the details but AFAIU the read/write semaphore was slower on high
contention.

Compile tested against some randconfig for different archs and tested against
android13-5.10 GKI kernel.

My testing is limited to resume path only; and general phone usage to make sure
nothing falls apart. Would be good to have some deadline specific testing done
too.

Based on v5.10.191

Original series:

	https://lore.kernel.org/lkml/20230508075854.17215-1-juri.lelli@redhat.com/

Thanks!

--
Qais Yousef

Dietmar Eggemann (2):
  sched/deadline: Create DL BW alloc, free & check overflow interface
  cgroup/cpuset: Free DL BW in case can_attach() fails

Juri Lelli (4):
  cgroup/cpuset: Rename functions dealing with DEADLINE accounting
  sched/cpuset: Bring back cpuset_mutex
  sched/cpuset: Keep track of SCHED_DEADLINE task in cpusets
  cgroup/cpuset: Iterate only if DEADLINE tasks are present

 include/linux/cpuset.h  |  12 ++-
 include/linux/sched.h   |   4 +-
 kernel/cgroup/cgroup.c  |   4 +
 kernel/cgroup/cpuset.c  | 161 ++++++++++++++++++++++++++++------------
 kernel/sched/core.c     |  41 +++++-----
 kernel/sched/deadline.c |  66 ++++++++++++----
 kernel/sched/sched.h    |   2 +-
 7 files changed, 202 insertions(+), 88 deletions(-)

-- 
2.34.1