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

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Date:   Mon, 25 Mar 2019 16:39:25 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Daniel Colascione <dancol@...gle.com>,
        Christian Brauner <christian@...uner.io>,
        Jann Horn <jannh@...gle.com>,
        Konstantin Khlebnikov <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 <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.
>

I don't consider this to be a problem.  I have patches to make this
problem go away forever.  I just need to tidy them up a bit and
upstream them.