linux-kernel - [PATCH v3 0/2] blk-cgroup: Optimize blkcg_rstat

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Message-Id: <20220601211824.89626-1-longman@redhat.com>
Date:   Wed,  1 Jun 2022 17:18:22 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>, Jens Axboe <axboe@...nel.dk>
Cc:     cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ming Lei <ming.lei@...hat.com>,
        Waiman Long <longman@...hat.com>
Subject: [PATCH v3 0/2] blk-cgroup: Optimize blkcg_rstat_flush()

This is a follow-up of [1]. There is no change in patch 1. Patch 2 has
the following changes:
 - Update comments in patch 2.
 - Put rcu_read_lock/unlock() in blkcg_rstat_flush().
 - Use READ_ONCE/WRITE_ONCE() to access lnode->next to reduce data
   races.
 - Get a blkg reference when putting into the lockless list and put it
   back when removed.

[1] https://lore.kernel.org/lkml/20220601165324.60892-1-longman@redhat.com/

Waiman Long (2):
  blk-cgroup: Correctly free percpu iostat_cpu in blkg on error exit
  blk-cgroup: Optimize blkcg_rstat_flush()

 block/blk-cgroup.c | 92 ++++++++++++++++++++++++++++++++++++++++++----
 block/blk-cgroup.h |  9 +++++
 2 files changed, 93 insertions(+), 8 deletions(-)

-- 
2.31.1