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From: Alexey Dobriyan <adobriyan@gmail.com>
To: Daniel Colascione <dancol@google.com>
Cc: Christian Brauner <christian@brauner.io>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Joel Fernandes <joel@joelfernandes.org>,
	Andy Lutomirski <luto@kernel.org>
Subject: Re: pidfd design
Date: Wed, 20 Mar 2019 23:39:10 +0300
Message-ID: <20190320203910.GA2842@avx2> (raw)
In-Reply-To: <CAKOZuespjOTbaTDbgQLo=7PXTE-nYCLy7k=s+RJh_GpZ_5gwgg@mail.gmail.com>

On Wed, Mar 20, 2019 at 01:14:01PM -0700, Daniel Colascione wrote:
> On Wed, Mar 20, 2019 at 1:07 PM Alexey Dobriyan <adobriyan@gmail.com> wrote:
> > > What would be your opinion to having a
> > > /proc/<pid>/handle
> > > file instead of having a dirfd.
> >
> > This is even worse than depending on PROC_FS. Just for the dependency
> > pidfd code should be backed out immediately. Forget about /proc.
> 
> We already have pidfds, and we've had them since /proc was added ages
> ago.

New pidfd code (or whatever the name) should NOT depend on /proc and
should not interact with VFS at all at any point (other than probably
being a descriptor on a fake filesystem). The reason is that /proc is
full of crap and you don't want to spill that into new and hopefully
properly designed part of new code.

  reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-20 20:07 Alexey Dobriyan
2019-03-20 20:14 ` Daniel Colascione
2019-03-20 20:39   ` Alexey Dobriyan [this message]
2019-03-20 20:47     ` Christian Brauner
2019-03-20 20:50       ` Daniel Colascione
2019-03-20 21:00         ` Christian Brauner
2019-03-22 14:04 ` Michael Tirado
2019-03-25 17:45   ` Linus Torvalds
2019-03-25 16:14     ` Michael Tirado
2019-03-25 20:45     ` Christian Brauner
2019-03-25 18:50   ` Christian Brauner
  -- strict thread matches above, loose matches on Subject: below --
2019-03-16 18:57 [RFC] simple_lmk: Introduce Simple Low Memory Killer for Android Christian Brauner
2019-03-16 19:37 ` Suren Baghdasaryan
2019-03-17  1:53   ` Joel Fernandes
2019-03-17 11:42     ` Christian Brauner
2019-03-17 15:40       ` Daniel Colascione
2019-03-18  0:29         ` Christian Brauner
2019-03-18 23:50           ` Joel Fernandes
2019-03-19 22:14             ` Christian Brauner
2019-03-19 22:48               ` Daniel Colascione
2019-03-19 23:10                 ` Christian Brauner
2019-03-20  1:52                   ` Joel Fernandes
2019-03-20  2:42                     ` pidfd design Daniel Colascione
2019-03-20  3:59                       ` Christian Brauner
2019-03-20  7:02                         ` Daniel Colascione
2019-03-20 11:33                           ` Joel Fernandes
2019-03-20 18:26                             ` Christian Brauner
2019-03-20 18:38                               ` Daniel Colascione
2019-03-20 18:51                                 ` Christian Brauner
2019-03-20 18:58                                   ` Andy Lutomirski
2019-03-20 19:14                                     ` Christian Brauner
2019-03-20 19:40                                       ` Daniel Colascione
2019-03-21 17:02                                         ` Andy Lutomirski
2019-03-25 20:13                                           ` Jann Horn
2019-03-25 20:23                                             ` Daniel Colascione
2019-03-25 23:42                                               ` Andy Lutomirski
2019-03-25 23:45                                                 ` Christian Brauner
2019-03-26  0:00                                                   ` Andy Lutomirski
2019-03-26  0:12                                                     ` Christian Brauner
2019-03-26  0:24                                                       ` Andy Lutomirski
2019-03-28  9:21                                                         ` Christian Brauner
2019-03-20 19:19                                   ` Joel Fernandes
2019-03-20 19:29                                   ` Daniel Colascione
2019-03-24 14:44                                     ` Serge E. Hallyn
2019-03-24 18:48                                       ` Joel Fernandes
2019-03-20 19:11                               ` Joel Fernandes

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