From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: "Daniel P. Berrange" <berrange-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: jpoimboe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Kay Sievers <kay.sievers-tD+1rO4QERM@public.gmane.org>,
lpoetter-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
workman-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
dhaval.giani-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: cgroup: status-quo and userland efforts
Date: Tue, 9 Apr 2013 12:46:40 -0700 [thread overview]
Message-ID: <20130409194640.GK6186@mtj.dyndns.org> (raw)
In-Reply-To: <20130409193851.GJ6186-9pTldWuhBndy/B6EtB590w@public.gmane.org>
A bit of addition.
On Tue, Apr 09, 2013 at 12:38:51PM -0700, Tejun Heo wrote:
> > We need to make the distribute approach work in order to support
> > containers, which requiring them to have a back-channel open to
> > the host userspace. If we can do that, then we've solved the problem
Why is back-channel such a bad thing? Even fully virtualized
environments do special things to communicate with the host (the whole
stack of virt drivers). It is sub-optimal and pointless to make
everything completely transparent. There's nothing wrong with the
basesystem knowing that they're inside a container or a virtualized
environment, so I don't understand why a back-channel is such a big
problem.
Thanks.
--
tejun
WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Li Zefan <lizefan@huawei.com>,
containers@lists.linux-foundation.org, cgroups@vger.kernel.org,
bsingharora@gmail.com, dhaval.giani@gmail.com,
Kay Sievers <kay.sievers@vrfy.org>,
jpoimboe@redhat.com, lpoetter@redhat.com,
workman-devel@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: cgroup: status-quo and userland efforts
Date: Tue, 9 Apr 2013 12:46:40 -0700 [thread overview]
Message-ID: <20130409194640.GK6186@mtj.dyndns.org> (raw)
In-Reply-To: <20130409193851.GJ6186@mtj.dyndns.org>
A bit of addition.
On Tue, Apr 09, 2013 at 12:38:51PM -0700, Tejun Heo wrote:
> > We need to make the distribute approach work in order to support
> > containers, which requiring them to have a back-channel open to
> > the host userspace. If we can do that, then we've solved the problem
Why is back-channel such a bad thing? Even fully virtualized
environments do special things to communicate with the host (the whole
stack of virt drivers). It is sub-optimal and pointless to make
everything completely transparent. There's nothing wrong with the
basesystem knowing that they're inside a container or a virtualized
environment, so I don't understand why a back-channel is such a big
problem.
Thanks.
--
tejun
next prev parent reply other threads:[~2013-04-09 19:46 UTC|newest]
Thread overview: 205+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-06 1:21 cgroup: status-quo and userland efforts Tejun Heo
2013-04-06 1:21 ` Tejun Heo
[not found] ` <20130406012159.GA17159-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-04-08 13:46 ` Glauber Costa
2013-04-08 13:46 ` Glauber Costa
2013-04-08 23:32 ` Lennart Poettering
2013-04-08 23:32 ` Lennart Poettering
2013-04-09 7:37 ` Glauber Costa
2013-04-09 7:37 ` Glauber Costa
[not found] ` <51635371.7070104-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-04-09 7:37 ` Glauber Costa
2013-04-09 19:11 ` Tejun Heo
2013-04-09 19:11 ` Tejun Heo
[not found] ` <5162CA21.4060108-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2013-04-08 18:00 ` [Workman-devel] " Vivek Goyal
2013-04-08 18:00 ` Vivek Goyal
2013-04-08 18:26 ` Tejun Heo
2013-04-08 18:26 ` Tejun Heo
2013-04-08 23:32 ` Lennart Poettering
2013-04-08 17:59 ` [Workman-devel] " Vivek Goyal
2013-04-08 17:59 ` Vivek Goyal
[not found] ` <20130408175925.GE28292-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-04-08 18:16 ` Tejun Heo
2013-04-08 18:16 ` Tejun Heo
[not found] ` <20130408181607.GI3021-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2013-04-08 18:49 ` Tejun Heo
2013-04-08 18:49 ` Tejun Heo
2013-04-08 19:11 ` Vivek Goyal
2013-04-08 19:11 ` Vivek Goyal
[not found] ` <20130408191105.GG28292-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-04-08 19:20 ` Tejun Heo
2013-04-08 19:20 ` Tejun Heo
[not found] ` <20130408192024.GL3021-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2013-04-08 19:46 ` Vivek Goyal
2013-04-08 19:46 ` Vivek Goyal
2013-04-08 20:02 ` Tejun Heo
2013-04-08 20:02 ` Tejun Heo
[not found] ` <20130408194630.GH28292-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-04-08 20:02 ` Tejun Heo
2013-04-09 9:50 ` Daniel P. Berrange
2013-04-09 9:50 ` Daniel P. Berrange
[not found] ` <20130409095024.GI25576-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-04-09 19:38 ` Tejun Heo
2013-04-09 19:38 ` Tejun Heo
[not found] ` <20130409193851.GJ6186-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-04-09 19:46 ` Tejun Heo [this message]
2013-04-09 19:46 ` Tejun Heo
[not found] ` <20130409194640.GK6186-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-04-09 21:04 ` Serge Hallyn
2013-04-09 21:04 ` Serge Hallyn
2013-04-09 21:11 ` Tejun Heo
2013-04-09 21:11 ` Tejun Heo
2013-04-09 21:11 ` Tejun Heo
2013-04-16 11:17 ` Li Zefan
2013-04-22 21:26 ` Tim Hockin
2013-04-16 11:17 ` Li Zefan
2013-04-16 11:17 ` Li Zefan
[not found] ` <516D333D.4040703-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2013-04-16 17:10 ` Tejun Heo
2013-04-16 17:10 ` Tejun Heo
2013-04-17 1:29 ` Li Zefan
2013-04-17 1:29 ` Li Zefan
[not found] ` <20130416171056.GA2874-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-04-17 1:29 ` Li Zefan
2013-04-22 21:26 ` Tim Hockin
2013-04-22 21:26 ` Tim Hockin
[not found] ` <CAAAKZwvh_R2Xz--bmSLiN33fsqKanOJMq_6+6hoFWFRx38O4gA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-04-22 21:41 ` Tejun Heo
2013-04-22 21:41 ` Tejun Heo
[not found] ` <20130422214159.GG12543-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2013-04-22 22:33 ` Tim Hockin
2013-04-22 22:33 ` Tim Hockin
2013-04-22 22:33 ` Tim Hockin
[not found] ` <CAAAKZwuXJwwyj7KSqb7rZ+nrTwBWEaUCWfa7kWecTBnHL8koGw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-22 23:13 ` Tim Hockin
2013-06-22 23:13 ` Tim Hockin
2013-06-22 23:13 ` Tim Hockin
[not found] ` <CAAAKZwvP_7wBBYMmtFuiE2hZt=ByaLrnTyiR83CZr3OMip63Gg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-25 0:01 ` Tejun Heo
2013-06-25 0:01 ` Tejun Heo
2013-06-25 4:07 ` Tim Hockin
2013-06-25 4:07 ` Tim Hockin
[not found] ` <CAAAKZwt09k-qUwLCnMpAQeYJ-S0XtkjXe4=bJ-G_fcrkAqEzoA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-26 21:20 ` Tejun Heo
2013-06-26 21:20 ` Tejun Heo
2013-06-27 0:06 ` Tim Hockin
2013-06-27 0:06 ` Tim Hockin
2013-06-26 23:14 ` David Lang
[not found] ` <CAAAKZws1qkSik4G4pRr7z+067Jp9-jHfpx9-euqbvmdHjoN_Zg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-26 23:14 ` David Lang
2013-06-27 1:04 ` Tejun Heo
2013-06-27 1:04 ` Tejun Heo
[not found] ` <20130627010427.GF4536-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2013-06-27 3:42 ` Tim Hockin
2013-06-27 3:42 ` Tim Hockin
[not found] ` <CAAAKZwsMT7FRccyVxSn77GR8+9JsSeqmDO6oOy7ycNCY7Desnw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-27 17:38 ` Tejun Heo
2013-06-27 17:38 ` Tejun Heo
2013-06-27 20:46 ` Tim Hockin
2013-06-27 20:46 ` Tim Hockin
[not found] ` <CAAAKZwvabGRsce43ymru7OBr0LX93DRnTVkzn-nhahTR6yMUZw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-27 21:04 ` Tejun Heo
2013-06-27 21:04 ` Tejun Heo
[not found] ` <20130627210445.GA22860-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-06-28 18:44 ` Tim Hockin
2013-06-28 18:44 ` Tim Hockin
[not found] ` <CAAAKZwtOnpATCmRcOpsXaLZ8sQDs2Z=iZb8FrqG=bajNAOBnRg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-29 16:40 ` Tejun Heo
2013-06-29 16:40 ` Tejun Heo
2015-03-03 21:53 ` Luke Leighton
[not found] ` <20130627173809.GB5599-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-06-27 20:46 ` Tim Hockin
2015-03-03 21:38 ` Luke Leighton
2015-03-03 21:17 ` Luke Leighton
2015-03-04 5:08 ` David Lang
2015-03-04 11:27 ` Luke Kenneth Casson Leighton
2015-03-04 20:08 ` David Lang
[not found] ` <20130626212047.GB4536-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2013-06-27 0:06 ` Tim Hockin
2013-06-27 5:45 ` Mike Galbraith
2013-06-27 5:45 ` Mike Galbraith
2013-06-27 5:45 ` Mike Galbraith
2013-06-27 13:22 ` Serge Hallyn
2013-06-27 13:22 ` Serge Hallyn
2013-06-27 15:29 ` Tim Hockin
2013-06-27 15:29 ` Tim Hockin
2013-06-27 15:29 ` Tim Hockin
2013-06-27 16:18 ` Serge Hallyn
2013-06-27 16:18 ` Serge Hallyn
2015-03-03 22:00 ` Luke Leighton
[not found] ` <CAAAKZwt9QdddFrEjvdBsi3sbQXScKyzY=vZpYXqTwjGUebH1Ag-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-27 16:18 ` Serge Hallyn
2013-06-27 17:48 ` Tejun Heo
2013-06-27 17:48 ` Tejun Heo
[not found] ` <20130627174850.GC5599-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-06-27 18:14 ` Serge Hallyn
2013-06-27 18:14 ` Serge Hallyn
2013-06-27 18:14 ` Serge Hallyn
2013-06-27 18:45 ` Tejun Heo
2013-06-27 18:45 ` Tejun Heo
[not found] ` <20130627184541.GA6400-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-06-27 18:51 ` Serge Hallyn
2013-06-27 18:51 ` Serge Hallyn
2013-06-27 18:51 ` Serge Hallyn
2013-06-27 18:52 ` Tejun Heo
2013-06-27 18:52 ` Tejun Heo
2013-06-27 18:52 ` Tejun Heo
2013-06-27 20:52 ` Tim Hockin
2013-06-27 20:52 ` Tim Hockin
2015-03-03 22:08 ` Luke Leighton
2013-06-28 9:09 ` [Workman-devel] " Daniel P. Berrange
2013-06-28 9:09 ` Daniel P. Berrange
2013-06-28 15:53 ` Serge Hallyn
2013-06-28 15:53 ` Serge Hallyn
2013-06-28 18:58 ` Tim Hockin
2013-06-28 18:58 ` Tim Hockin
2015-03-03 22:20 ` Luke Leighton
[not found] ` <20130628090910.GB2507-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-06-28 15:53 ` Serge Hallyn
[not found] ` <1372311907.5871.78.camel-YqMYhexLQo31wTEvPJ5Q0F6hYfS7NtTn@public.gmane.org>
2013-06-27 13:22 ` Serge Hallyn
2013-06-27 18:01 ` Tejun Heo
2013-06-27 18:01 ` Tejun Heo
2013-06-27 18:01 ` Tejun Heo
2013-06-28 3:46 ` Mike Galbraith
2013-06-28 3:46 ` Mike Galbraith
[not found] ` <1372391198.5989.110.camel-YqMYhexLQo31wTEvPJ5Q0F6hYfS7NtTn@public.gmane.org>
2013-06-28 4:09 ` Tejun Heo
2013-06-28 4:09 ` Tejun Heo
2013-06-28 4:09 ` Tejun Heo
2013-06-28 4:49 ` Mike Galbraith
2013-06-28 4:49 ` Mike Galbraith
[not found] ` <1372394950.5989.128.camel-YqMYhexLQo31wTEvPJ5Q0F6hYfS7NtTn@public.gmane.org>
2013-06-28 5:01 ` Tejun Heo
2013-06-28 5:01 ` Tejun Heo
2013-06-28 5:01 ` Tejun Heo
[not found] ` <20130628050138.GD2500-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2013-06-28 6:00 ` Mike Galbraith
2013-06-28 6:00 ` Mike Galbraith
2013-06-28 15:05 ` Michal Hocko
2013-06-28 15:05 ` Michal Hocko
2013-06-28 15:05 ` Michal Hocko
[not found] ` <20130628150513.GD5125-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2013-06-28 18:01 ` [Workman-devel] " Vivek Goyal
2013-06-28 18:01 ` Vivek Goyal
[not found] ` <20130628180155.GD16483-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-06-28 19:59 ` Daniel P. Berrange
2013-06-28 19:59 ` Daniel P. Berrange
[not found] ` <20130628195917.GG2507-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-06-28 22:40 ` Serge Hallyn
2013-06-28 22:40 ` Serge Hallyn
2013-06-28 22:40 ` Serge Hallyn
2013-06-28 22:43 ` Tejun Heo
2013-06-28 22:43 ` Tejun Heo
2013-06-28 22:43 ` Tejun Heo
2013-06-30 18:38 ` Michal Hocko
2013-06-30 18:38 ` Michal Hocko
2013-06-30 18:38 ` Michal Hocko
[not found] ` <20130630183838.GB23731-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2013-07-15 18:49 ` Vivek Goyal
2013-07-15 18:49 ` Vivek Goyal
[not found] ` <20130715184940.GG27338-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-07-23 14:48 ` Michal Hocko
2013-07-23 14:48 ` Michal Hocko
2013-07-23 14:48 ` Michal Hocko
2013-06-28 18:30 ` Tejun Heo
2013-06-28 18:30 ` Tejun Heo
2013-06-28 18:53 ` Tim Hockin
2013-06-28 18:53 ` Tim Hockin
[not found] ` <CAAAKZwtqYe-c0bfkgHFbzsOKVHifjTwkqcpci=uS1JwqS9TJHQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-28 19:01 ` Vrijendra (वृजेन्द्र) Gokhale
2013-06-29 1:48 ` Lennart Poettering
2013-06-29 1:48 ` Lennart Poettering
[not found] ` <51CE3CE0.9010506-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-06-29 3:05 ` Tim Hockin
2013-06-29 3:05 ` Tim Hockin
[not found] ` <CAAAKZwuzhSzPj99HZW=KD4emGXZbcsjsUu=+TCpafhs9MKD2JA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-06-30 19:39 ` Lennart Poettering
2013-06-30 19:39 ` Lennart Poettering
2013-07-02 23:57 ` Thomas Gleixner
2013-07-02 23:57 ` Thomas Gleixner
[not found] ` <alpine.DEB.2.02.1307030021480.4013-3cz04HxQygjZikZi3RtOZ1XZhhPuCNm+@public.gmane.org>
2013-07-03 0:44 ` Kay Sievers
2013-07-03 17:11 ` James Bottomley
2013-07-03 0:44 ` Kay Sievers
2013-07-03 0:44 ` Kay Sievers
2013-07-03 7:37 ` Borislav Petkov
2013-07-03 7:37 ` Borislav Petkov
2013-07-03 9:30 ` Thomas Gleixner
2013-07-03 9:30 ` Thomas Gleixner
2013-07-09 23:12 ` Jiri Kosina
2013-07-09 23:12 ` Jiri Kosina
[not found] ` <CAPXgP12AyogbFX_hPPmQD5GFG0-+_crsnHF3epDZSRds3-WNtQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-03 7:37 ` Borislav Petkov
2013-07-03 9:30 ` Thomas Gleixner
2013-07-09 23:12 ` Jiri Kosina
2013-07-03 17:11 ` James Bottomley
2013-07-03 17:11 ` James Bottomley
[not found] ` <51D08976.6040005-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-07-01 6:06 ` Tim Hockin
2013-07-01 6:06 ` Tim Hockin
2013-07-02 23:57 ` Thomas Gleixner
[not found] ` <20130628040930.GC2500-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2013-06-28 4:49 ` Mike Galbraith
[not found] ` <20130627180143.GD5599-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-06-28 3:46 ` Mike Galbraith
2013-06-28 19:18 ` Andy Lutomirski
2013-06-28 19:18 ` Andy Lutomirski
[not found] ` <51CDE18E.8080009-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
2013-06-28 19:36 ` Serge Hallyn
2013-06-28 19:36 ` Serge Hallyn
2013-06-28 19:36 ` Serge Hallyn
[not found] ` <20130625000118.GT1918-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-06-25 4:07 ` Tim Hockin
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