From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: Daniel Lezcano <daniel.lezcano-GANU6spQydw@public.gmane.org>
Cc: kyle-hoO6YkzgTuCM0SS3m2neIg@public.gmane.org,
"David C. Hansen"
<haveblue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>,
bastian-yyjItF7Rl6lg9hUCZPvPmw@public.gmane.org,
ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org,
containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org,
sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org,
alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org,
xemul-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org
Subject: Re: [PATCH 0/9] Multiple devpts instances
Date: Thu, 19 Feb 2009 11:58:18 -0800 [thread overview]
Message-ID: <499DB9DA.2070301@zytor.com> (raw)
In-Reply-To: <499DA069.3040603-GANU6spQydw@public.gmane.org>
Daniel Lezcano wrote:
>>
>> Resource limit partitioning is a much bigger and orthogonal problem.
>>
> In this case we don't have the pty allocated independently, no ?
> I mean one container can allocate 4095 pty, making a pty starvation for
> others containers. Or imagine I am a vilain and I want to mess the other
> containers, I can do echo 0 > /proc/sys/kernel/pty/max.
> AFAIR, we said people making isolation of a resource is in charge (if it
> is relevant), to take into account the /proc/sys part.
>
> For example, making the network per namespace all the network
> configuration variable located in /proc/sys/net are per namespace too.
> When it is irrelevant the file is read-only or just not displayed.
>
> IMHO, pty/max and pty/nr is part of the "multiple devpts instances"
> feature.
>
Naming and resource partitioning are two orthogonal issues, regardless
of what's IYHO.
Really. You have the same classes of issues with ANY allocatable
resource in the system. Period. Furthermore, there are quite a few
applications which want one and not the other. Trying to entangle them
is broken.
-hpa
next prev parent reply other threads:[~2009-02-19 19:58 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-15 5:30 [PATCH 0/9] Multiple devpts instances sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8
[not found] ` <20081015053000.GA2039-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-10-15 5:33 ` [PATCH 1/9] Remove devpts_root global sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8
2008-10-15 5:33 ` [PATCH 2/9] Per-mount allocated_ptys sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8
2008-10-15 5:34 ` [PATCH 3/9] Per-mount 'config' object sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8
2008-10-15 5:35 ` [PATCH 4/9] Extract option parsing to new function sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8
2008-10-15 5:35 ` [PATCH 5/9] Add DEVPTS_MULTIPLE_INSTANCES config token sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8
2008-10-15 5:36 ` [PATCH 6/9] Define mknod_ptmx() sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8
2008-10-15 5:37 ` [PATCH 7/9] Define get_init_pts_sb() sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8
2008-10-15 5:37 ` [PATCH 8/9] Enable multiple instances of devpts sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8
2008-10-15 5:38 ` [PATCH 9/9] Document usage of multiple-instances " sukadev-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8
[not found] ` <20081015053800.GI2215-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-10-15 18:57 ` Serge E. Hallyn
[not found] ` <20081015185722.GA30005-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-10-15 19:03 ` H. Peter Anvin
[not found] ` <48F63E76.3030907-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2008-10-15 19:48 ` Serge E. Hallyn
2008-10-16 15:19 ` [PATCH 0/9] Multiple devpts instances Serge E. Hallyn
2009-02-19 15:43 ` Daniel Lezcano
[not found] ` <499D7E13.10601-GANU6spQydw@public.gmane.org>
2009-02-19 17:32 ` H. Peter Anvin
[not found] ` <499D97B1.1090902-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2009-02-19 18:09 ` Daniel Lezcano
[not found] ` <499DA069.3040603-GANU6spQydw@public.gmane.org>
2009-02-19 19:58 ` H. Peter Anvin [this message]
[not found] ` <499DB9DA.2070301-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2009-02-19 22:28 ` Eric W. Biederman
[not found] ` <m1vdr6xdqv.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2009-02-20 4:22 ` H. Peter Anvin
2009-02-19 22:42 ` Daniel Lezcano
[not found] ` <499DE06E.4030108-GANU6spQydw@public.gmane.org>
2009-02-19 22:46 ` H. Peter Anvin
2009-02-19 23:59 ` Eric W. Biederman
[not found] ` <m1eixuvv00.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2009-02-23 20:56 ` Serge E. Hallyn
[not found] ` <20090223205609.GA32351-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2009-02-23 21:18 ` H. Peter Anvin
[not found] ` <49A31299.8040501-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2009-02-23 22:27 ` Serge E. Hallyn
2009-02-24 4:09 ` Eric W. Biederman
2009-02-23 21:19 ` Daniel Lezcano
[not found] ` <49A312E6.9090900-GANU6spQydw@public.gmane.org>
2009-02-23 21:23 ` H. Peter Anvin
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