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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. |
| − | | |
| − | == 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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| | # Kamalesh Babulal | | # Kamalesh Babulal |
| | # John Schulz | | # John Schulz |
| − | # 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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| | * 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 ? | |
| − | | |
| − | 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 :) | |
| | | | |
| | == 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]] |
