linux-kernel - Re: [PATCH v3 4/5] mm/memcg: Separate out object stock data into its own struct

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Date:   Thu, 15 Apr 2021 12:57:53 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Waiman Long <longman@...hat.com>
Cc:     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>, Roman Gushchin <guro@...com>,
        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>,
        Wei Yang <richard.weiyang@...il.com>,
        Masayoshi Mizuma <msys.mizuma@...il.com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>
Subject: Re: [PATCH v3 4/5] mm/memcg: Separate out object stock data into its
 own struct

On Tue, Apr 13, 2021 at 09:20:26PM -0400, Waiman Long wrote:
> The object stock data stored in struct memcg_stock_pcp are independent
> of the other page based data stored there. Separating them out into
> their own struct to highlight the independency.
> 
> Signed-off-by: Waiman Long <longman@...hat.com>
> Acked-by: Roman Gushchin <guro@...com>
> Reviewed-by: Shakeel Butt <shakeelb@...gle.com>
> ---
>  mm/memcontrol.c | 41 ++++++++++++++++++++++++++---------------
>  1 file changed, 26 insertions(+), 15 deletions(-)

It's almost twice more code, and IMO not any clearer. Plus it adds
some warts: int dummy[0], redundant naming in stock->obj.cached_objcg,
this_cpu_ptr() doesn't really need a wrapper etc.