linux-kernel - Re: [PATCH 0/4] pid: add pidctl()

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Message-ID: <CAKOZuev9TccQekrJjt50AhKA5cYskMmmKR3WF+Rm7G1xmbiV_w@mail.gmail.com>
Date:   Mon, 25 Mar 2019 09:58:38 -0700
From:   Daniel Colascione <dancol@...gle.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Christian Brauner <christian@...uner.io>,
        Jann Horn <jannh@...gle.com>, khlebnikov@...dex-team.ru,
        Andy Lutomirski <luto@...nel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linux API <linux-api@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Kerrisk-manpages <mtk.manpages@...il.com>,
        bl0pbl33p@...il.com, "Dmitry V. Levin" <ldv@...linux.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        nagarathnam.muthusamy@...cle.com, Aleksa Sarai <cyphar@...har.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH 0/4] pid: add pidctl()

On Mon, Mar 25, 2019 at 9:56 AM David Howells <dhowells@...hat.com> wrote:
> Daniel Colascione <dancol@...gle.com> wrote:
>
> > System calls are cheap.
>
> Only to a point.  x86_64 will have an issue when we hit syscall 512.  We're
> currently at 427.

IIRC, a while ago, someone proposed restarting system call numbering
above (again, IIRC) 1024 for both 32- and 64-bit varieties to
establish a clean slate and sidestep this problem.