linux-kernel - [PATCH-cgroup 0/2] cgroup/cpuset: Include isolated cpuset CPUs in cpu_is

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Message-Id: <20231127041956.266026-1-longman@redhat.com>
Date:   Sun, 26 Nov 2023 23:19:54 -0500
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Frederic Weisbecker <frederic@...nel.org>
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mrunal Patel <mpatel@...hat.com>,
        Ryan Phillips <rphillips@...hat.com>,
        Brent Rowsell <browsell@...hat.com>,
        Peter Hunt <pehunt@...hat.com>,
        Waiman Long <longman@...hat.com>
Subject: [PATCH-cgroup 0/2] cgroup/cpuset: Include isolated cpuset CPUs in cpu_is_isolated()

This patchset enables the inclusion of CPUs in isolated cpuset partitions
in the cpu_is_isolated() check to reduce interference caused by vmstat
or memcg local stock flushing.

To reduce cpu_is_isolated() call overhead, a seqcount is used to
protect read access of the isolated cpumask without taking any lock. As
a result, the callback_lock is changed to a raw_spinlock_t to make it
work in PREEMPT_RT kernel too.

Waiman Long (2):
  cgroup/cpuset: Make callback_lock a raw_spinlock_t
  cgroup/cpuset: Include isolated cpuset CPUs in cpu_is_isolated() check

 include/linux/cpuset.h          |   6 ++
 include/linux/sched/isolation.h |   4 +-
 kernel/cgroup/cpuset.c          | 127 +++++++++++++++++++-------------
 3 files changed, 85 insertions(+), 52 deletions(-)

-- 
2.39.3