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Date:   Tue, 12 Jan 2021 13:59:39 -0800
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>, broonie@...nel.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Michal Hocko <mhocko@...e.cz>, mm-commits@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: mmotm 2021-01-12-01-57 uploaded (NR_SWAPCACHE in mm/)

On Tue, Jan 12, 2021 at 1:50 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Tue, 12 Jan 2021 12:38:18 -0800 Randy Dunlap <rdunlap@...radead.org> wrote:
>
> > On 1/12/21 1:58 AM, akpm@...ux-foundation.org wrote:
> > > The mm-of-the-moment snapshot 2021-01-12-01-57 has been uploaded to
> > >
> > >    https://www.ozlabs.org/~akpm/mmotm/
> > >
> > > mmotm-readme.txt says
> > >
> > > README for mm-of-the-moment:
> > >
> > > https://www.ozlabs.org/~akpm/mmotm/
> > >
> > > This is a snapshot of my -mm patch queue.  Uploaded at random hopefully
> > > more than once a week.
> > >
> >
> > on i386 and x86_64:
> >
> > when CONFIG_SWAP is not set/enabled:
> >
> > ../mm/migrate.c: In function ‘migrate_page_move_mapping’:
> > ../mm/migrate.c:504:35: error: ‘NR_SWAPCACHE’ undeclared (first use in this function); did you mean ‘QC_SPACE’?
> >     __mod_lruvec_state(old_lruvec, NR_SWAPCACHE, -nr);
> >                                    ^~~~~~~~~~~~
> >
> > ../mm/memcontrol.c:1529:20: error: ‘NR_SWAPCACHE’ undeclared here (not in a function); did you mean ‘SGP_CACHE’?
> >   { "swapcached",   NR_SWAPCACHE   },
> >                     ^~~~~~~~~~~~
>
> Thanks.  I did the below.
>
> But we're still emitting "Node %d SwapCached: 0 kB" in sysfs when
> CONFIG_SWAP=n, which is probably wrong.  Shakeel, can you please have a
> think?
>

Thanks Andrew for fixing. Independent of this patch, we already print
""SwapCached:" in /proc/meminfo for CONFIG_SWAP=n, so I think doing
the same for per-node meminfo should be fine too.

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