linux-kernel - Re: [PATCH v3 2/3] mm, memcg: inline mem_cgroup_{charge/uncharge} to improve disabled memcg config

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Message-ID: <CAJuCfpFNXmH3gQ51c-+3U_0HPG401dE9Mp9_hwMP67Tyg-zWGg@mail.gmail.com>
Date:   Sun, 18 Jul 2021 14:25:50 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <guro@...com>,
        Muchun Song <songmuchun@...edance.com>,
        Yang Shi <shy828301@...il.com>, Alex Shi <alexs@...nel.org>,
        Wei Yang <richard.weiyang@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>, Jens Axboe <axboe@...nel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        David Hildenbrand <david@...hat.com>, apopple@...dia.com,
        Minchan Kim <minchan@...nel.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>,
        cgroups mailinglist <cgroups@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        kernel-team <kernel-team@...roid.com>
Subject: Re: [PATCH v3 2/3] mm, memcg: inline mem_cgroup_{charge/uncharge} to
 improve disabled memcg config

On Sun, Jul 18, 2021 at 9:56 AM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Fri, Jul 09, 2021 at 05:36:25PM -0700, Suren Baghdasaryan wrote:
> > @@ -6723,7 +6722,7 @@ static int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
> >  }
> >
> >  /**
> > - * mem_cgroup_charge - charge a newly allocated page to a cgroup
> > + * __mem_cgroup_charge - charge a newly allocated page to a cgroup
> >   * @page: page to charge
> >   * @mm: mm context of the victim
> >   * @gfp_mask: reclaim mode
>
> This patch conflicts with the folio work, so I'm just rebasing the
> folio patches on top of this, and I think this part of the patch is a
> mistake.  We don't want to document the __mem_cgroup_charge() function.
> That's an implementation detail.  This patch should instead have moved the
> kernel-doc to memcontrol.h and continued to document mem_cgroup_charge().

Ack.
There was a v4 version of this patch:
https://lore.kernel.org/patchwork/patch/1458907 which was picked up by
Andrew already. If others agree that documentation should be moved
into the header file then I'll gladly post another version. Or I can
post a separate patch moving the documentation only. Whatever works
best. Andrew, Michal, Johannes, WDYT?