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

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Date:   Mon, 19 Sep 2022 15:30:20 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Ivan Babrou <ivan@...udflare.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...udflare.com>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC] proc: report open files as size in stat() for /proc/pid/fd

On Sat, Sep 17, 2022 at 11:32:02AM -0700, Ivan Babrou wrote:
> > > > * Make fd count acces O(1) and expose it in /proc/pid/status
> >
> > This is doable, next to FDSize.
> 
> It feels like a better solution, but maybe I'm missing some context
> here. Let me know whether this is preferred.

I don't know. I'd put it in st_size as you did initially.
/proc/*/status should be slow.