linux-kernel - Re: [PATCH v2] proc: report open files as size in stat() for /proc/pid/fd

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Date:   Tue, 18 Oct 2022 09:12:51 +0100
From:   Frank Hofmann <fhofmann@...udflare.com>
To:     Ivan Babrou <ivan@...udflare.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...udflare.com, Alexey Dobriyan <adobriyan@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        "Theodore Ts'o" <tytso@....edu>,
        David Laight <David.Laight@...lab.com>,
        Jonathan Corbet <corbet@....net>,
        David Hildenbrand <david@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Christoph Anton Mitterer <mail@...istoph.anton.mitterer.name>,
        Mike Rapoport <rppt@...nel.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Kalesh Singh <kaleshsingh@...gle.com>
Subject: Re: [PATCH v2] proc: report open files as size in stat() for /proc/pid/fd

On Tue, Oct 18, 2022 at 6:02 AM Ivan Babrou <ivan@...udflare.com> wrote:
>
> On Mon, Oct 17, 2022 at 6:47 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
> > > +
> > > +             fdt = files_fdtable(p->files);
> > > +             size = fdt->max_fds;
> > > +
> > > +             for (i = size / BITS_PER_LONG; i > 0;)
> > > +                     open_fds += hweight64(fdt->open_fds[--i]);
> >
> > Could BITMAP_WEIGHT() or __bitmap_weight() or bitmap_weight() be used here?
>
> That's a great suggestion. I tested it with bitmap_weight() and it
> looks much cleaner while providing the same result.
>
> I just sent the v3 with this suggestion applied.

+1 from me on using bitmap_weight() - good spotting that.

FrankH.