linux-kernel - Re: [PATCH v2] timens: show clock symbolic names in /proc/pid/timens

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Message-ID: <CAKgNAkha+=3Lxq+AVsRqPNb9FxVEG4rx1wr=HfoV3RfosKi=Tw@mail.gmail.com>
Date:   Tue, 14 Apr 2020 11:51:08 +0200
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andrei Vagin <avagin@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux API <linux-api@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Dmitry Safonov <0x7f454c46@...il.com>
Subject: Re: [PATCH v2] timens: show clock symbolic names in /proc/pid/timens_offsets

On Tue, 14 Apr 2020 at 00:47, Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Sun, 12 Apr 2020 07:51:47 +0200 "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com> wrote:
>
> > Hi Andrei,
> >
> > On Sat, 11 Apr 2020 at 17:40, Andrei Vagin <avagin@...il.com> wrote:
> > >
> > > Michael Kerrisk suggested to replace numeric clock IDs on symbolic
> > > names.
> > >
> > > Now the content of these files looks like this:
> > > $ cat /proc/774/timens_offsets
> > > monotonic      864000         0
> > > boottime      1728000         0
> >
> > Thanks.
> >
> > Assuming no-one has objections to the patch, please do mark for stable@.
> >
>
> `grep -r timens_offsets Documentation' comes up blank.  Is
> /proc/pid/timens_offsets documented anywhere?  If not, it should be!
> And this patch should update that documentation.
>
> I assume the time namespace feature itself is documented under clone(2)?

We're good, so far. There's time_namespaces(7) [1] and documentation
of CLONE_NEWTIME in unshare(2) [2].

CLONE_NEWTIME support for clone3() is still a work in progress [3].

Thanks,

Michael

[1] http://man7.org/linux/man-pages/man7/time_namespaces.7.html
[2] http://man7.org/linux/man-pages/man2/unshare.2.html
[3] https://lore.kernel.org/lkml/20200317083043.226593-1-areber@redhat.com/


--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/