In this talk I plan to describe my first impression from working on open source project, how the community is organized and what can be gained by contributing to open source community. As a supporting fact of positive outcome from participating in similar projects, I will provide an example from my personal experience. It demonstrates how anyone can dive into open source development and work on project of choice. I introduce my work on virtual NUMA within XenProject and OPW program. It will demonstrate the challenges that newbie will face diving into mature development product and process, the necessity of discipline, commitment and self-organization. I will show what I had to learn in order to move forward, what I had to focus on and how to progress. The work what was done at this moment would not be possible without help of project mentors, source code knowledge, learning how to extract information from patches and ask right questions. I hope this example will bring more passionate developers into the community of open source software and hacking.

1. OPW - Xen vNUMA
OPW - outreach program for women
Me – Elena - Linux kernel XenProject Intern
vNUMA – virtual NUMA
Xen – you know...
was working on OPW all summer 2013, had fun and really enjoyed coding, best mentors in town
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2. Outreach program for women

3. Mentors
OPW
Mentors
Xen and kernel
mentors

4. NUMA and Linux
NUMA topology parsing
NUMA aware scheduling
Automatic NUMA balancing
libnuma

5. Xen vNUMA
●
'enlighten' guest with vNUMA topology
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performance in mind
●
let user decide on virtual topology

6. pNUMA + vNUMA
virtual NUMA nodes
VM 1
A
VM 2
B
VM 3
A
B
C
A
B
node1
A
node2
B
A
A
Physical NUMA nodes
B
C
B

7. OPW internship
●
OPW, Linux Foundation, XenProject
●
Meet my mentors
●
development community
●
Learn source code
●
Xen and kernel
●
vNUMA

8. What was done
●
Xen and Linux patches
●
Understand code
●
Comments from community
●
vNUMA in Xen rc 4.4

9. PV guest with vNUMA
Configure vNUMA topology
Or leave it automatic
Boot vNUMA aware guest
name = "vm1"
memory = 4096
vcpus = 4
vnodes = 2
vnumamem = [2048, 2048]
vdistance = [10, 20]
vnuma_vcpumap =[1, 0, 1, 0]
vnuma_vnodemap = [0, 1, 1, 0, 1, 1]
name = "vm2"
memory = 4096
vnodes = 2

10. PV guest with vNUMA
Configure vNUMA topology
name = "vm1"
memory = 4096
vcpus = 4
vnodes = 2
vnumamem = [2048, 2048]
vdistance = [10, 20]
vnuma_vcpumap =[1, 0, 1, 0]
vnuma_vnodemap = [0, 1, 1, 0, 1, 1]
Boot vNUMA aware guest

11. What has to be done
●
A lot! :)
●
Dom0/HVM NUMA awareness
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Automatic NUMA balancing support
●
Performance evaluations
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Heuristics/Statistics

12. What I have learned
●
Source code
●
Patches
●
Coding styles
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Xen and para-virtual guests
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Linux, booting, memory management

13. Thank you
●
Linux Foundation and GNOME
●
XenProject, Citrix, Oracle
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Xen project mentors and Linux Kernel Mentors
Dario Steffano George Konrad Sarah Greg