From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
Cc: Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>,
Cyrill Gorcunov
<gorcunov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Nathan Lynch <ntl-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org>,
Linux Containers
<containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org>,
Serge Hallyn <serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>,
Daniel Lezcano <dlezcano-NmTC/0ZBporQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH 7/7] binfmt: Introduce the binfmt_img exec handler
Date: Thu, 21 Jul 2011 08:51:27 +0200 [thread overview]
Message-ID: <20110721065127.GS3455@htj.dyndns.org> (raw)
In-Reply-To: <4E204519.3040804-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
On Fri, Jul 15, 2011 at 05:48:09PM +0400, Pavel Emelyanov wrote:
> When being execve-ed the handler reads registers, mappings and provided
> memory pages from image and just assigns this state on current task. This
> simple functionality can be used to restore a task, whose state whas read
> from e.g. /proc/<pid>/dump file before.
Ummm... iff the process is single threaded. :(
Much more complex machinery is needed to restore full process anyway
which would require some kernel facilities but definitely a lot more
logic in userland. I really can't see much point in having
dumper/restorer in kernel. The simplistic dumper/restorer proposed
here isn't really useful - among other things, it's single threaded
only and there's no mechanism to freeze the task being dumped. It is
almost trivially implementable from userland using existing
facilities. I wonder what the point is.
Thanks.
--
tejun
next prev parent reply other threads:[~2011-07-21 6:51 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-15 13:45 [RFC][PATCH 0/7 + tools] Checkpoint/restore mostly in the userspace Pavel Emelyanov
[not found] ` <4E204466.8010204-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-15 13:45 ` [PATCH 0/1] proc: Introduce the /proc/<pid>/mfd/ directory Pavel Emelyanov
[not found] ` <4E20448A.5010207-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-21 7:21 ` Tejun Heo
2011-07-15 13:46 ` [PATCH 2/7] vfs: Introduce the fd closing helper Pavel Emelyanov
[not found] ` <4E2044A7.4030103-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-21 15:47 ` Serge E. Hallyn
2011-07-15 13:46 ` [PATCH 3/7] proc: Introduce the Children: line in /proc/<pid>/status Pavel Emelyanov
[not found] ` <4E2044C3.7050506-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-21 6:54 ` Tejun Heo
[not found] ` <20110721065436.GT3455-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2011-07-23 8:06 ` Pavel Emelyanov
[not found] ` <4E2A8116.1040309-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-23 8:41 ` Tejun Heo
[not found] ` <20110723084110.GG21089-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-07-23 8:45 ` Pavel Emelyanov
[not found] ` <4E2A8A0E.5030208-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-23 8:50 ` Tejun Heo
[not found] ` <20110723085014.GI21089-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-07-23 8:51 ` Pavel Emelyanov
2011-07-21 15:54 ` Serge E. Hallyn
2011-07-15 13:47 ` [PATCH 4/7] vfs: Add ->statfs callback for pipefs Pavel Emelyanov
[not found] ` <4E2044D6.3060205-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-21 6:59 ` Tejun Heo
2011-07-21 15:59 ` Serge E. Hallyn
2011-07-15 13:47 ` [PATCH 5/7] clone: Introduce the CLONE_CHILD_USEPID functionality Pavel Emelyanov
[not found] ` <4E2044EB.20001-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-21 16:04 ` Serge E. Hallyn
[not found] ` <20110721160459.GD19012-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-07-22 23:08 ` Matt Helsley
[not found] ` <20110722230848.GB16940-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-23 8:09 ` Pavel Emelyanov
2011-07-15 13:47 ` [PATCH 6/7] proc: Introduce the /proc/<pid>/dump file Pavel Emelyanov
[not found] ` <4E204500.6040800-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-16 22:57 ` Kirill A. Shutemov
[not found] ` <20110716225709.GA25606-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>
2011-07-17 8:06 ` Cyrill Gorcunov
2011-07-21 6:44 ` Tejun Heo
[not found] ` <20110721064408.GR3455-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2011-07-23 8:11 ` Pavel Emelyanov
[not found] ` <4E2A8239.5060908-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-23 8:37 ` Tejun Heo
[not found] ` <20110723083711.GF21089-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-07-23 8:49 ` Pavel Emelyanov
[not found] ` <4E2A8B12.4010709-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-23 8:58 ` Tejun Heo
2011-07-15 13:48 ` [PATCH 7/7] binfmt: Introduce the binfmt_img exec handler Pavel Emelyanov
[not found] ` <4E204519.3040804-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-21 6:51 ` Tejun Heo [this message]
[not found] ` <20110721065127.GS3455-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2011-07-22 22:46 ` Matt Helsley
[not found] ` <20110722224617.GA16940-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-23 8:17 ` Pavel Emelyanov
[not found] ` <4E2A83AC.6090504-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-23 8:45 ` Tejun Heo
[not found] ` <20110723084529.GH21089-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-07-23 8:51 ` Pavel Emelyanov
[not found] ` <4E2A8B7D.8010807-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-23 9:04 ` Tejun Heo
2011-07-15 13:49 ` [TOOLS] To make use of the patches Pavel Emelyanov
[not found] ` <4E204554.6040901-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-22 23:45 ` Matt Helsley
[not found] ` <20110722234558.GD16940-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-23 8:32 ` Pavel Emelyanov
[not found] ` <4E2A8704.3030306-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-07-27 23:00 ` Matt Helsley
[not found] ` <20110727230003.GE15501-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-28 8:23 ` James Bottomley
2011-07-23 0:40 ` Reply #2: " Matt Helsley
[not found] ` <20110723004045.GC21563-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-23 8:33 ` Pavel Emelyanov
2011-07-15 15:01 ` [RFC][PATCH 0/7 + tools] Checkpoint/restore mostly in the userspace Tejun Heo
2011-07-18 13:27 ` Serge E. Hallyn
[not found] ` <20110718132759.GB8127-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org>
2011-07-23 8:43 ` Pavel Emelyanov
2011-07-23 0:25 ` Matt Helsley
[not found] ` <20110723002558.GE16940-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-23 3:29 ` Matt Helsley
[not found] ` <20110723032945.GD21563-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-23 4:58 ` Tejun Heo
[not found] ` <20110723045842.GD21089-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-07-26 18:11 ` Matt Helsley
[not found] ` <20110726181128.GD14808-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-26 22:45 ` Tejun Heo
[not found] ` <20110726224525.GC28497-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-07-26 23:07 ` Matt Helsley
2011-07-23 3:53 ` Tejun Heo
[not found] ` <CAOS58YPqLSYi2xECUk4O5GG3s6aokT=VykmkL6UnAOzyHXNAgQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-07-26 22:59 ` Matt Helsley
[not found] ` <20110726225911.GF14808-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-26 23:46 ` Tejun Heo
[not found] ` <20110726234657.GD28497-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-07-27 0:53 ` Matt Helsley
[not found] ` <20110727005341.GB15501-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-27 10:12 ` Tejun Heo
[not found] ` <20110727101228.GY2622-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2011-07-27 22:26 ` Matt Helsley
2011-07-23 5:10 ` Tejun Heo
[not found] ` <20110723051005.GE21089-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-07-26 22:02 ` Matt Helsley
[not found] ` <20110726220215.GE14808-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-26 22:21 ` Tejun Heo
[not found] ` <20110726222109.GB28497-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-07-27 0:06 ` Matt Helsley
[not found] ` <20110727000651.GA15501-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-27 12:01 ` Tejun Heo
[not found] ` <20110727120114.GZ2622-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2011-07-27 21:35 ` Matt Helsley
[not found] ` <20110727213510.GC15501-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2011-07-28 7:21 ` Tejun Heo
[not found] ` <20110728072141.GB2622-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org>
2011-07-28 7:23 ` Tejun Heo
2011-07-28 8:37 ` James Bottomley
2011-07-28 9:10 ` Tejun Heo
2011-07-23 8:39 ` Pavel Emelyanov
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