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− | There was a containers mini-summit at the [http://www.linuxsymposium.org/2008/ OLS'08]. This page served for organizing this event. | + | There will be a containers mini-summit at the [http://www.linuxsymposium.org/2008/ OLS'08]. This page is for organizing this mini-summit. Feel free to edit. |
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− | '''When''': 22nd of July 2008, 8:30-16:30<br/> | + | '''When''': 22nd of July 2008<br/> |
− | '''Where''': Ottawa, ON, Canada, Novotel Hotel (Albion A). | + | '''Where''': Ottawa, ON, Canada. |
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− | == Notes ==
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− | For the notes from the mini-summit, '''see [[Containers/Mini-summit 2008 notes]].'''
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| == Proposal == | | == Proposal == |
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− | The mini-summit proposal sent to OLS organizers; '''see [[/Proposal|proposal]]'''. | + | The mini-summit proposal sent to OLS organizers. '''See [[/Proposal|proposal]]'''. |
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| == Topics to discuss == | | == Topics to discuss == |
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| <!-- Put this in three columns if browser is smart enough --> | | <!-- Put this in three columns if browser is smart enough --> |
| <div style="-moz-column-count:3; -webkit-column-count:3; column-count:3; text-align: left; background: #fefef0; border: 1px solid #ddddc0;"> | | <div style="-moz-column-count:3; -webkit-column-count:3; column-count:3; text-align: left; background: #fefef0; border: 1px solid #ddddc0;"> |
| + | # Kir Kolyshkin |
| # Pavel Emelyanov | | # Pavel Emelyanov |
| # Denis Lunev | | # Denis Lunev |
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| # Patrick Naubert | | # Patrick Naubert |
| # Daisuke Nishimura | | # Daisuke Nishimura |
− | # Sudhir Kumar
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− | # Munehiro Ikeda
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− | # Kamalesh Babulal
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− | # John Schulz
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− | # Poornima Nayak
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− | # Gyuil Cha
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− | # YoungHo Kim
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− | # Rob Woolley
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− | # Daniel Robbins
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− | # Jason Baron
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− | # Subrata Modak
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− | # Veerendra C
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− | # Joe MacDonald
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− | # Andrew Theurer
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− | # Myron Stowe
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− | # Peter Teoh
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− | # Ricky Liang
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| </div> | | </div> |
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| == Agenda == | | == Agenda == |
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− | * Namespaces/Containers (8:30am-11am) | + | * Namespaces/Containers (8am-10:30am) |
| ** sysfs issues (and any /proc issues) | | ** sysfs issues (and any /proc issues) |
| *** uevents/hotplug | | *** uevents/hotplug |
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| * Cgroups+Resource management (11:30-2pm) | | * Cgroups+Resource management (11:30-2pm) |
| ** Cgroup implementation | | ** Cgroup implementation |
− | *** Locking (don't let cgroup_lock() become the BKL)
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− | *** Transactional attachment
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− | *** "procs" file
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− | *** User-space notification API
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− | **** Resource counter hit soft/hard limit
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− | **** Task entered/left cgroup
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− | **** OOM occurred
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− | *** Binary statistics API
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− | ** Existing cgroups
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− | *** Memory (Balbir's NOTE: I would prefer to take some of this discussion to my memory controller BoF on Wednesday. Lets discuss this at the end)
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− | **** Supporting over-commit and guarantees
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− | **** Soft-limits
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− | **** Hierarchical borrowing - in kernel or userspace?
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− | **** Per-cgroup refault information?
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− | *** Kernel memory
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− | *** Device
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− | *** Memrlimit
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− | **** Some push-back over this - can we give real use cases?
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− | *** CPU scheduler
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| ** Additional cgroups and their design | | ** Additional cgroups and their design |
− | *** Swap (separate subsystem or merge with memory?)
| + | ** libcg - userspace explotation of control groups/resource management |
− | *** Disk I/O (several proposed designs)
| + | ** Resource management |
− | *** Network traffic classification
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− | *** Freezer
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− | *** Signaller
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− | *** OOM Handler
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− | ** libcg - userspace explotation of control groups/resource management | |
− | *** Overview so far | |
− | *** Is kernel-based reclassification needed?
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− | *** Real use-cases
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− | *** Future directions
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| * Checkpoint/Restart (2:30pm-5pm) | | * Checkpoint/Restart (2:30pm-5pm) |
− | ** Documentation : Look at "See Also" section below | + | ** Summary of existing c/r patchsets/designs |
− | ** Goals and expectations of this summit
| + | ** How to initiate and synchronize checkpoint/restart |
− | *** identify, discuss and (if possible) agree on the general design | + | ** (state of freezer subsystem?) |
− | *** identify, discuss and (if possible) agree on the technical points
| + | ** Memory state dump |
− | *** decide on priorities for different components (eg. high, medium, low) such that the final outcome is a practical road-map that would keep us busy for (at least) until the next OLS (though the "O" may change ;)
| + | ** How to dump/fetch data for resource (file, ipc) checkpoint |
− | ** What are the problems that the linux community can solve with the checkpoint/restart ?
| + | ** How to do restart |
− | ** Preparing the kernel internals | + | ** Hopefully we can make decisions here, and get a bit of a hackfest going during OLS |
− | *** How we implement it without affecting long term maintainability ?
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− | *** What are the kernel subsystems, process resources and framework for CR ? | |
− | *** Which pieces to target first ? | |
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− | The following technical points can be discussed during the mini-summit if we have time or later at the OLS.
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− | | |
− | ** Checkpointing / Restarting
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− | *** Reaching a quescient point - network, processes, aio, avoiding side effects of quiesce/revive
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− | *** Checkpoint - signal handler ? syscall ? crfs ? process hierarchy, resource dependencies, system and process resources
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− | *** Restarting - New binary format handler ? converting between formats (from older kernel to newer)
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− | *** Notification to processes which explicitly wish to be notified about quiesce, checkpoint and restart - container state ? new signals ? | |
− | ** Determining the userspace API - Posix 1003.1m ?
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− | ** Passing the kernel internal state to/from userspace - coredump like file ? swap per container ? netlinks, CR filesystem ? army of different call for the CR (proc, existing syscalls, ...)
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− | ** Hopefully we can continue to discuss in the next days and get a bit of a hackfest going during OLS :) | |
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| == Moderators == | | == Moderators == |
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| * http://www.linuxsymposium.org/2008/cfp.php — OLS call for papers | | * http://www.linuxsymposium.org/2008/cfp.php — OLS call for papers |
| * https://lists.linux-foundation.org/pipermail/containers/2008-January/009688.html | | * https://lists.linux-foundation.org/pipermail/containers/2008-January/009688.html |
− | * http://openvz.org/pipermail/devel/2008-July/012891.html
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− | * Checkpoint/Restart
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− | ** Zap : http://www.ncl.cs.columbia.edu/publications/usenix2007_fordist.pdf
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− | ** Metacluster : http://lxc.sourceforge.net/doc/ols2006/lxc-ols2006.pdf
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− | ** OpenVZ : [[Checkpointing and live migration]]
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− | ** Checkpoint/Restart technology : http://en.wikipedia.org/wiki/Application_checkpointing
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− | ** Virtual Servers and Checkpoint/Restart in Mainstream Linux : Sigops document
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− | ** Remote fork: http://www.cse.nd.edu/~dthain/courses/classconf/wowsys2004/talks/rfork.pdf
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− | ** Vmadump : http://bproc.sourceforge.net/c268.html
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− | ** Posix CR : http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/0650/bks/SGI_Admin/CPR_OG/sgi_html/ch03.html
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− | ** An OS services overview : http://sw-eng.falls-church.va.us/itsg/P08V31.htm
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| [[Category: Containers]] | | [[Category: Containers]] |
| [[Category: Events]] | | [[Category: Events]] |