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From: Ian Kent <raven-PKsaG3nR2I+sTnJN9+BGXg@public.gmane.org>
To: "Eric W. Biederman"
	<ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>,
	David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: mszeredi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	Linux Containers
	<containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	James Bottomley
	<James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>,
	viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org,
	trondmy-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org,
	linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [RFC][PATCH 0/9] Make containers kernel objects
Date: Wed, 24 May 2017 17:16:49 +0800	[thread overview]
Message-ID: <1495617409.2538.1.camel__24775.2154282809$1495617427$gmane$org@themaw.net> (raw)
In-Reply-To: <87k256ek3e.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>

On Wed, 2017-05-24 at 03:26 -0500, Eric W. Biederman wrote:
> 
> So far no one has even bothered to seriously try the one solution that
> is guaranteed to work because it takes a lot of changes to kernel code.
> I believe the last effort snagged on what a pain it is to refactor the
> user mode helper infrastructure.

Yes, that's mostly true in my case although I wouldn't say I haven't looked at
it seriously but equally I haven't got anything towards it yet either, sorry.

I'm likely going to revisit this based on a couple of approaches.

One is just what you describe and I had already been looking at this some time
ago. It seems to me that adding a work queue type that starts and retains a
process until the work queue is destroyed (similar to the way the work queue sub
system starts a fail over thread for use under resource exhaustion) would be a
sensible way to do it.

This doesn't mean I think it's a good idea for reasons I've outlined in the past
but the approach does warrant the effort to work out if it can be used without
problems.

And there's also the request key infrastructure which, as it is now, gets in the
road of verifying results, *sigh*.

Ian

  parent reply	other threads:[~2017-05-24  9:16 UTC|newest]

Thread overview: 118+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-22 16:22 [RFC][PATCH 0/9] Make containers kernel objects David Howells
2017-05-22 16:22 ` David Howells
2017-05-22 16:22 ` [PATCH 1/9] containers: Rename linux/container.h to linux/container_dev.h David Howells
2017-05-22 16:22 ` [PATCH 2/9] Implement containers as kernel objects David Howells
2017-08-14  5:47   ` Richard Guy Briggs
2017-08-14  5:47     ` Richard Guy Briggs
     [not found]     ` <20170814054711.GB29957-bcJWsdo4jJjeVoXN4CMphl7TgLCtbB0G@public.gmane.org>
2017-08-16 22:21       ` Paul Moore
2017-08-16 22:21     ` Paul Moore
2017-08-16 22:21       ` Paul Moore
2017-08-16 22:21       ` Paul Moore
     [not found]       ` <CAHC9VhRgPRa7KeMt8G700aeFvqVYc0gMx__82K31TYY6oQQqTw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-08-18  8:03         ` Richard Guy Briggs
2017-08-18  8:03       ` Richard Guy Briggs
2017-08-18  8:03         ` Richard Guy Briggs
2017-09-06 14:03         ` Serge E. Hallyn
2017-09-06 14:03           ` Serge E. Hallyn
     [not found]           ` <20170906140341.GA8729-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2017-09-14  5:47             ` Richard Guy Briggs
2017-09-14  5:47           ` Richard Guy Briggs
2017-09-14  5:47             ` Richard Guy Briggs
     [not found]         ` <20170818080300.GQ7187-bcJWsdo4jJjeVoXN4CMphl7TgLCtbB0G@public.gmane.org>
2017-09-06 14:03           ` Serge E. Hallyn
2017-09-08 20:02           ` Paul Moore
2017-09-08 20:02         ` Paul Moore
     [not found]   ` <149547016213.10599.1969443294414531853.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-08-14  5:47     ` Richard Guy Briggs
2017-05-22 16:22 ` [PATCH 3/9] Provide /proc/containers David Howells
2017-05-22 16:22   ` David Howells
2017-05-22 16:22 ` [PATCH 4/9] Allow processes to be forked and upcalled into a container David Howells
2017-05-22 16:22   ` David Howells
2017-05-22 16:23 ` [PATCH 5/9] Open a socket inside " David Howells
2017-05-22 16:23 ` [PATCH 6/9] Allow fs syscall dfd arguments to take a container fd David Howells
2017-05-22 16:23 ` [PATCH 7/9] Make fsopen() able to initiate mounting into a container David Howells
2017-05-22 16:23 ` [PATCH 8/9] Honour CONTAINER_NEW_EMPTY_FS_NS David Howells
2017-05-22 16:23   ` David Howells
2017-05-22 16:23 ` [PATCH 9/9] Sample program for driving container objects David Howells
     [not found] ` <149547014649.10599.12025037906646164347.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-05-22 16:53   ` [RFC][PATCH 0/9] Make containers kernel objects James Bottomley
2017-05-22 16:53     ` James Bottomley
2017-05-22 17:14     ` Aleksa Sarai
2017-05-22 17:14       ` Aleksa Sarai
2017-05-22 17:27     ` Jessica Frazelle
2017-05-22 17:27       ` Jessica Frazelle
2017-05-22 18:34     ` Jeff Layton
2017-05-22 18:34       ` Jeff Layton
     [not found]       ` <1495478092.2816.17.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-05-22 19:21         ` James Bottomley
2017-05-22 19:21       ` James Bottomley
2017-05-22 19:21         ` James Bottomley
2017-05-22 22:14         ` Jeff Layton
     [not found]         ` <1495480860.9050.18.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-05-22 22:14           ` Jeff Layton
2017-05-23 10:35           ` Ian Kent
2017-05-23 10:35         ` Ian Kent
2017-05-23 10:35           ` Ian Kent
2017-05-23  9:38     ` Ian Kent
2017-05-23  9:38       ` Ian Kent
2017-05-23  9:38       ` Ian Kent
     [not found]     ` <1495472039.2757.19.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-05-22 17:14       ` Aleksa Sarai
2017-05-22 17:27       ` Jessica Frazelle
2017-05-22 18:34       ` Jeff Layton
2017-05-23  9:38       ` Ian Kent
2017-05-23 13:52       ` David Howells
     [not found]     ` <f167feeb-e653-12e3-eec8-24162f7f7c07-l3A5Bk7waGM@public.gmane.org>
2017-05-23 14:53       ` David Howells
2017-05-23 14:53     ` David Howells
2017-05-23 14:56       ` Eric W. Biederman
2017-05-23 14:56         ` Eric W. Biederman
     [not found]       ` <2446.1495551216-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-05-23 14:56         ` Eric W. Biederman
2017-05-23 15:14       ` David Howells
2017-05-23 15:14         ` David Howells
     [not found]         ` <2961.1495552481-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-05-23 15:17           ` Eric W. Biederman
2017-05-23 15:17             ` Eric W. Biederman
     [not found]             ` <87bmqjmwl5.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-05-23 15:44               ` James Bottomley
2017-05-23 15:44             ` James Bottomley
2017-05-23 15:44               ` James Bottomley
     [not found]             ` <1495554267.27369.9.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2017-05-23 16:36               ` David Howells
2017-05-23 16:36                 ` David Howells
     [not found]                 ` <3860.1495557363-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-05-24  8:26                   ` Eric W. Biederman
2017-05-24  8:26                     ` Eric W. Biederman
2017-05-24  9:16                     ` Ian Kent
2017-05-24  9:16                       ` Ian Kent
     [not found]                     ` <87k256ek3e.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-05-24  9:16                       ` Ian Kent [this message]
     [not found]       ` <87zie3mxkc.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-05-23 15:14         ` David Howells
2017-05-22 17:11 ` Jessica Frazelle
2017-05-22 17:11   ` Jessica Frazelle
2017-05-22 19:04 ` Eric W. Biederman
2017-05-22 19:04   ` Eric W. Biederman
2017-05-22 22:22   ` Jeff Layton
2017-05-22 22:22     ` Jeff Layton
2017-05-23 12:54     ` Eric W. Biederman
2017-05-23 12:54       ` Eric W. Biederman
2017-05-23 14:27       ` Jeff Layton
2017-05-23 14:27         ` Jeff Layton
2017-05-23 14:30       ` Djalal Harouni
2017-05-23 14:30         ` Djalal Harouni
2017-05-23 14:54         ` Colin Walters
2017-05-23 14:54           ` Colin Walters
2017-05-23 15:31           ` Jeff Layton
2017-05-23 15:31             ` Jeff Layton
2017-05-23 15:35             ` Colin Walters
2017-05-23 15:35               ` Colin Walters
2017-05-23 15:30         ` David Howells
2017-05-23 14:23     ` Djalal Harouni
2017-05-23 14:23       ` Djalal Harouni
2017-05-27 17:45   ` Trond Myklebust
2017-05-27 17:45     ` Trond Myklebust
2017-05-27 19:10     ` James Bottomley
2017-05-27 19:10       ` James Bottomley
2017-05-30  1:03     ` Ian Kent
2017-05-30  1:03       ` Ian Kent
2017-05-23 10:09 ` Ian Kent
2017-05-23 10:09   ` Ian Kent
2017-05-23 13:52 ` David Howells
2017-05-23 13:52   ` David Howells
2017-05-23 15:02   ` James Bottomley
2017-05-23 15:02     ` James Bottomley
     [not found]   ` <32556.1495547529-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2017-05-23 15:02     ` James Bottomley
2017-05-23 15:23     ` Eric W. Biederman
2017-05-23 15:23   ` Eric W. Biederman
2017-05-23 15:12 ` David Howells
2017-05-23 15:12   ` David Howells
2017-05-23 15:33 ` Eric W. Biederman
2017-05-23 15:33   ` Eric W. Biederman
2017-05-23 16:13 ` David Howells
2017-05-23 16:13   ` David Howells

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