linux-kernel - Re: [PATCH RFC] fs/fcntl: add fcntl F_GET

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Date:   Mon, 28 Oct 2019 13:27:32 +0100
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>
Subject: Re: [PATCH RFC] fs/fcntl: add fcntl F_GET_RSS

On Mon, Oct 28, 2019 at 11:28 AM Konstantin Khlebnikov
<khlebnikov@...dex-team.ru> wrote:
>
> This implements fcntl() for getting amount of resident memory in cache.
> Kernel already maintains counter for each inode, this patch just exposes
> it into userspace. Returned size is in kilobytes like values in procfs.

This doesn't actually explain why anybody would want it, and what the
usage scenario is.

             Linus