Archived/Xen Development Projects: Difference between revisions
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Dave.scott (talk | contribs) (Remove both of Jonathan Davies' projects at his request) |
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DRBD should be implemented as a new SR type on top of LVM. The tools for managing DRBD devices need to be built into storage management, along with the logic for switching the active and standby nodes. |
DRBD should be implemented as a new SR type on top of LVM. The tools for managing DRBD devices need to be built into storage management, along with the logic for switching the active and standby nodes. |
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|Project= Expose counters for additional aspects of system performance in XCP |
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|Date=01/30/2013 |
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|Contact=Jonathan Davies <''first.last''@citrix.com> |
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|Difficulty=Low |
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|Skills=Basic familiarity with administration of a Xen and/or Linux host |
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|Desc=XCP stores performance data persistently in round robin databases (RRDs). Presently, XCP only exposes a few aspects of system performance through the RRD mechanism, e.g. vCPU and pCPU utilisation, VM memory size, host network throughput. |
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The XCP RRD daemon (xcp-rrdd) provides a plugin interface to allow other processes to provide data sources. In principle, these plugins can be written in any language by using the XML-RPC/JSON interface (although presently bindings only exist for OCaml). |
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The project: |
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Create plugins that expose additional information, including things like: |
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* total amount of CPU cycles used by each VM |
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* VM- or VBD/VIF-level disk and network throughput |
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* number of event channels consumed per domain |
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* how much work is each VM demanding of qemu, netback, blkback, xenstored? |
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* perhaps other statistics only currently easily obtainable via xentrace |
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|Outcomes=A set of plugins is authored in a suitable language and demonstrated to work in XCP. The code is submitted to the XCP project on github. |
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|GSoC=yes}} |
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{{project |
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|Project=Add support for XCP performance counters to be sampled at varying rates |
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|Date=01/30/2013 |
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|Contact=Jonathan Davies <''first.last''@citrix.com> |
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|Difficulty=Medium |
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|Skills=xcp-rrdd is coded in OCaml, so familiarity with this language would be helpful |
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|Desc=XCP's RRD daemon (xcp-rrdd) stores performance data persistently in 'round robin databases' (RRDs). Each of these is a fixed size structure containing data at multiple resolutions. 'Data sources' are sampled at five-second intervals and points are added to the highest resolution RRD. Periodically each high-frequency RRD is 'consolidated' (e.g. averaged) to produce a data point for a lower-frequency RRD. In this way, data for a long period of time can be stored in a space-efficient manner, with the older data being lower in resolution than more recent data. |
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However, some data sources change very slowly (e.g. CPU temperature, available disk capacity). So it is overkill to sample them every five seconds. This becomes a problem when it is costly to sample them, perhaps because it involves a CPU-intensive computation or disk activity. |
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The RRD daemon provides a plugin interface to allow other processes to provide data sources. |
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The project goal is to generalise the RRD daemon's data-source sampling mechanism to allow it to sample data sources at different frequencies. Extend the plugin interface to allow plugins to suggest the frequency at which they are sampled. |
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|Outcomes=A mechanism is defined and code produced to meet the project goals. The code is submitted to the XCP project on github. |
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|GSoC=yes}} |
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Revision as of 16:02, 13 February 2014
This page lists various Xen related development projects that can be picked up by anyone! If you're interesting in hacking Xen this is the place to start! Ready for the challenge?
To work on a project:
- Find a project that looks interesting (or a bug if you want to start with something simple)
- Send an email to xen-devel mailinglist and let us know you started working on a specific project.
- Post your ideas, questions, RFCs to xen-devel sooner than later so you can get comments and feedback.
- Send patches to xen-devel early for review so you can get feedback and be sure you're going into correct direction.
- Your work should be based on xen-unstable development tree, if it's Xen and/or tools related. After your patch has been merged to xen-unstable it can be backported to stable branches (Xen 4.2, Xen 4.1, etc).
- Your kernel related patches should be based on upstream kernel.org Linux git tree (latest version).
xen-devel mailinglist subscription and archives: http://lists.xensource.com/mailman/listinfo/xen-devel
Before to submit patches, please look at Submitting Xen Patches wiki page.
If you have new ideas, suggestions or development plans let us know and we'll update this list!
List of projects
Domain support
Upstreaming Xen PVSCSI drivers to mainline Linux kernel
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Upstreaming Xen PVUSB drivers to mainline Linux kernel
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Implement Xen PVSCSI support in xl/libxl toolstack
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Implement Xen PVUSB support in xl/libxl toolstack
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Block backend/frontend improvements
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Utilize Intel QuickPath on network and block path.
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Parallel xenwatch kthread
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Enabling the 9P File System transport as a paravirt device
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OVMF Compatibility Support Module support in Xen
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Hypervisor
Introducing PowerClamp-like driver for Xen
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Integrating NUMA and Tmem
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HVM per-event-channel interrupts
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Userspace Tools
Refactor Linux hotplug scripts
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XL to XCP VM motion
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VM Snapshots
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Allowing guests to boot with a passed-through GPU as the primary display
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Advanced Scheduling Parameters
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CPU/RAM/PCI diagram tool
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KDD (Windows Debugger Stub) enhancements
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Lazy restore using memory paging
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CPUID Programming for Humans
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Performance
Create a tiny VM for easy load testing
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Xen Cloud Platform (XCP) and XAPI projects
There are separate wiki pages about XCP and XAPI related projects. Make sure you check these out aswell!
Fuzz testing Xen with Mirage
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Mirage OS cloud API support
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From simulation to emulation to production: self-scaling apps
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Towards a multi-language unikernel substrate for Xen
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DRBD Integration
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- XCP and XAPI development projects: XAPI project suggestions
- XCP short-term roadmap: XCP short term roadmap
- XCP monthly developer meetings: XCP Monthly Meetings
- XAPI developer guide: XAPI Developer Guide
Please see XenRepositories wiki page!