linux-kernel - Re: [PATCH] mm: memcontrol: separate {pgscan,pgsteal}_{kswapd,direct} items in memory.stat of cgroup v2

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Date:   Sat, 4 Jun 2022 10:48:56 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Qi Zheng <zhengqi.arch@...edance.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>
Subject: Re: [PATCH] mm: memcontrol: separate {pgscan,pgsteal}_{kswapd,direct}
 items in memory.stat of cgroup v2

On Fri, Jun 3, 2022 at 3:06 PM Qi Zheng <zhengqi.arch@...edance.com> wrote:
>
> There are already statistics of {pgscan,pgsteal}_kswapd and
> {pgscan,pgsteal}_direct of memcg event here, but now the sum
> of the two is displayed in memory.stat of cgroup v2.
>
> In order to obtain more accurate information during monitoring
> and debugging, and to align with the display in /proc/vmstat,
> it better to display {pgscan,pgsteal}_kswapd and
> {pgscan,pgsteal}_direct separately.
>
> Moreover, after this modification, all memcg events can be
> printed with a combination of vm_event_name() and memcg_events().
> This allows us to create an array to traverse and print, which
> reduces redundant seq_buf_printf() codes.
>
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>

With Shakeel's changes.

Acked-by: Muchun Song <songmuchun@...edance.com>