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

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Date:   Sun, 18 Jul 2021 22:29:28 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
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 02:25:50PM -0700, Suren Baghdasaryan wrote:
> 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?

At this point, I've moved the documentation as part of the folio patch.
I'd rather not redo that patch again ...