linux-kernel - Re: [PATCH 1/5] mm/memcg: Pass both memcg and lruvec to mod_memcg_lruvec

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Date:   Mon, 12 Apr 2021 15:24:34 -0400
From:   Waiman Long <llong@...hat.com>
To:     Roman Gushchin <guro@...com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Alex Shi <alex.shi@...ux.alibaba.com>,
        Chris Down <chris@...isdown.name>,
        Yafang Shao <laoar.shao@...il.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Masayoshi Mizuma <msys.mizuma@...il.com>
Subject: Re: [PATCH 1/5] mm/memcg: Pass both memcg and lruvec to
 mod_memcg_lruvec_state()

On 4/12/21 2:04 PM, Roman Gushchin wrote:
> On Fri, Apr 09, 2021 at 07:18:38PM -0400, Waiman Long wrote:
>> The caller of mod_memcg_lruvec_state() has both memcg and lruvec readily
>> available. So both of them are now passed to mod_memcg_lruvec_state()
>> and __mod_memcg_lruvec_state(). The __mod_memcg_lruvec_state() is
>> updated to allow either of the two parameters to be set to null. This
>> makes mod_memcg_lruvec_state() equivalent to mod_memcg_state() if lruvec
>> is null.
> This patch seems to be correct, but it's a bit hard to understand why
> it's required without looking into the rest of the series. Can you, please,
> add a couple of words about it? E.g. we need it to handle stats which do not
> exist on the lruvec level...
>
> Otherwise,
> Acked-by: Roman Gushchin <guro@...com>

Good point. Will update the commit log to indicate the change is needed 
for the subsequent patch.

Cheers,
Longman