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Date:   Tue, 18 Feb 2020 00:29:27 +0100
From:   Thomas Gleixner <>
To:     Christian Brauner <>,
        "Michael Kerrisk \(man-pages\)" <>
Cc:     Dmitry Safonov <>, Andrei Vagin <>,
        Linux Kernel <>,
        Dmitry Safonov <>,
        Adrian Reber <>,
        Andy Lutomirski <>,
        Arnd Bergmann <>,
        Cyrill Gorcunov <>,
        "Eric W. Biederman" <>,
        "H. Peter Anvin" <>, Ingo Molnar <>,
        Jann Horn <>, Jeff Dike <>,
        Oleg Nesterov <>,
        Pavel Emelyanov <>,
        Shuah Khan <>,
        Vincenzo Frascino <>,
        containers <>,, Linux API <>,, Andrei Vagin <>
Subject: Re: Time Namespaces: CLONE_NEWTIME and clone3()?

Christian Brauner <> writes:
> On Mon, Feb 17, 2020 at 10:47:53PM +0100, Michael Kerrisk (man-pages) wrote:
>> Actually, I think the alternative you propose just here is better. I
>> imagine there are times when one will want to create multiple
>> namespaces with a single call to clone3(), including a time namespace.
>> I think this should be allowed by the API. And, otherwise, clone3()
>> becomes something of a second-class citizen for creating namespaces.
>> (I don't really get the "less invasive" argument. Implementing this is
>> just a piece of kernel to code to make user-space's life a bit simpler
>> and more consistent.)
> I don't particularly mind either way. If there's actual users that need
> to set it at clone3() time then we can extend it. So I'd like to hear
> what Adrian, Dmitry, and Thomas think since they are well-versed how
> this will be used in the wild. I'm weary of exposing a whole new uapi
> struct and extending clone3() without any real use-case but I'm happy to
> if there is!

I really have no clue. I merily helped getting this in shape without
creating havoc for timekeeping and VDSO. I have to punt to the container



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