linux-kernel - [PATCH-cgroup v5 0/2] cgroup/rstat: Further reduce cpu_lock hold time in cgroup_rstat_flush

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Message-Id: <20231130204327.494249-1-longman@redhat.com>
Date:   Thu, 30 Nov 2023 15:43:25 -0500
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Joe Mario <jmario@...hat.com>,
        Sebastian Jug <sejug@...hat.com>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        Waiman Long <longman@...hat.com>
Subject: [PATCH-cgroup v5 0/2] cgroup/rstat: Further reduce cpu_lock hold time in cgroup_rstat_flush_locked

 v5:
  - Drop patch "cgroup/rstat: Reduce cpu_lock hold time in
    cgroup_rstat_flush_locked()" as it has been merged into the for-6.8
    branch.
  - Rework the recursive cgroup_rstat_push_children() into an iterative
    function to prevent possibility of stack overflow.

 v4:
  - Update patch 2 to fix a minor bug and update some of the comments.

 v3:
  - Minor comment twisting as suggested by Yosry.
  - Add patches 2 and 3 to further reduce lock hold time

The purpose of this patch series is to further reduce the cpu_lock
hold time of cgroup_rstat_flush_locked() so as to reduce the latency
impact when cgroup_rstat_updated() is called as they may contend with
each other on the cpu_lock.

Waiman Long (2):
  cgroup/rstat: Optimize cgroup_rstat_updated_list()
  cgroup: Avoid false cacheline sharing of read mostly rstat_cpu

 include/linux/cgroup-defs.h |   7 ++
 kernel/cgroup/rstat.c       | 153 +++++++++++++++++++++---------------
 2 files changed, 98 insertions(+), 62 deletions(-)

-- 
2.39.3