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Re: [RFC 1/3] procfs: fdinfo -- Extend information about epoll target files

From Andy Lutomirski <luto@amacapital.net>
Newsgroups linux.kernel
Subject Re: [RFC 1/3] procfs: fdinfo -- Extend information about epoll target files
Date 2017-02-21 19:50 +0100
Message-ID <tdnFD-6qe-3@gated-at.bofh.it> (permalink)
References <tdmgx-5z4-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue, Feb 21, 2017 at 8:59 AM, Cyrill Gorcunov <gorcunov@openvz.org> wrote:
> Since it is possbile to have same number in tfd field (say
> file added, closed, then nother file dup'ed to same number
> and added back) it is imposible to distinguish such target
> files solely by their numbers.
>
> Strictly speaking regular applications don't need to recognize
> these targets at all but for checkpoint/restore sake we need
> to collect targets to be able to push them back on restore
> in proper order.
>
> Thus lets add file position, inode and device number where
> this target lays. This three fields can be used as a primary
> key for sorting, and together with kcmp help CRIU can find
> out an exact file target (from the whole set of processes
> being checkpointed).

I have no problem with this, but I'm wondering whether kcmp's ordered
comparisons could also be used for this purpose.

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[RFC 1/3] procfs: fdinfo -- Extend information about epoll target files Cyrill Gorcunov <gorcunov@openvz.org> - 2017-02-21 18:20 +0100
  Re: [RFC 1/3] procfs: fdinfo -- Extend information about epoll target files Andy Lutomirski <luto@amacapital.net> - 2017-02-21 19:50 +0100
    Re: [RFC 1/3] procfs: fdinfo -- Extend information about epoll  target files Cyrill Gorcunov <gorcunov@gmail.com> - 2017-02-21 20:20 +0100
      Re: [RFC 1/3] procfs: fdinfo -- Extend information about epoll  target files Cyrill Gorcunov <gorcunov@gmail.com> - 2017-02-22 09:00 +0100
        Re: [RFC 1/3] procfs: fdinfo -- Extend information about epoll  target files Cyrill Gorcunov <gorcunov@gmail.com> - 2017-02-22 09:20 +0100
          Re: [RFC 1/3] procfs: fdinfo -- Extend information about epoll  target files Cyrill Gorcunov <gorcunov@gmail.com> - 2017-02-22 09:40 +0100

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