linux-kernel - Re: [PATCH v10 0/3] blk-cgroup: Optimize blkcg_rstat

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Date:   Wed, 16 Nov 2022 16:58:34 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Waiman Long <longman@...hat.com>
Cc:     cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ming Lei <ming.lei@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Koutný <mkoutny@...e.com>,
        Hillf Danton <hdanton@...a.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH v10 0/3] blk-cgroup: Optimize blkcg_rstat_flush()

On 11/16/22 4:06 PM, Waiman Long wrote:
> On 11/4/22 20:58, Waiman Long wrote:
>> ? v10:
>> ?? - Update patch 3 to rename the rstat function to
>> ???? cgroup_rstat_css_cpu_flush().
>>
>> ? v9:
>> ?? - Remove patch "llist: Allow optional sentinel node terminated lockless
>> ???? list" for now. This will be done as a follow-up patch.
>> ?? - Add a new lqueued field to blkg_iostat_set to store the status of
>> ???? whether lnode is in a lockless list.
>> ?? - Add a new patch 3 to speed up the freeing of blkcg by flushing out
>> ???? the rstat lockless lists at blkcg offline time.
>>
>> ? v8:
>> ?? - Update the llist patch to make existing llist functions and macros
>> ???? work for both NULL and sentinel terminated lockless list as much
>> ???? as possible and leave only the initialization and removal functions
>> ???? to have a sentinel terminated llist variants.
>>
>> This patch series improves blkcg_rstat_flush() performance by eliminating
>> unnecessary blkg enumeration and flush operations for those blkg's and
>> blkg_iostat_set's that haven't been updated since the last flush.
>>
>> Waiman Long (3):
>> ?? blk-cgroup: Return -ENOMEM directly in blkcg_css_alloc() error path
>> ?? blk-cgroup: Optimize blkcg_rstat_flush()
>> ?? blk-cgroup: Flush stats at blkgs destruction path
>>
>> ? block/blk-cgroup.c???? | 103 +++++++++++++++++++++++++++++++++++------
>> ? block/blk-cgroup.h???? |? 10 ++++
>> ? include/linux/cgroup.h |?? 1 +
>> ? kernel/cgroup/rstat.c? |? 20 ++++++++
>> ? 4 files changed, 119 insertions(+), 15 deletions(-)
> 
> Jens, do you have any further comment on this patchset? Is it possible
> to queue it for the next Linux version?

Looks good to me, I'll queue it up.

-- 
Jens Axboe