linux-kernel - Re: clone3: allow creation of time namespace with offset

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Message-ID: <20200529151346.lpciwzfscf2tknoe@wittgenstein>
Date:   Fri, 29 May 2020 17:13:46 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Adrian Reber <areber@...hat.com>
Cc:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Pavel Emelyanov <ovzxemul@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Andrei Vagin <avagin@...il.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Radostin Stoyanov <rstoyanov1@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: clone3: allow creation of time namespace with offset

On Fri, May 29, 2020 at 05:10:29PM +0200, Adrian Reber wrote:
> On Fri, May 29, 2020 at 02:26:13PM +0200, Michael Kerrisk (man-pages) wrote:
> > Hi Adrian,
> > 
> > If there was a revision to this patch, I missed it. Is there still a
> > plan to bring CLONE_NEWTIME to clone3()?
> 
> Good that you ask. The discussion ended at the point that we do not have
> a way to figure out what a syscall supports from user-space.  I talked a
> bit with Christian about it and he mentioned that there were some ideas
> floating around how to do that. At that point it made more sense to me
> to wait for such a solution to appear before continuing the clone3()
> time namespace work.

We need to have a little talk at ksummit about some aspects of syscall
design. I'm writing something up for this. But we're not in a rush
anyway, I take it.

Christian