It's my research proposal for the poster of Releng workshop 2014.

1. Improving the Integration Process
of Large Software Systems
Yujuan Jiang, Bram Adams
MCIS, Polytechnique Montreal, Canada
1
Friday, 18 April, 14

2. Integration & its Challenges
external library
host project
platform:
Java 7
dependency:
Java 8
2
Friday, 18 April, 14

3. I do hold out hope that Google does come
around and works to fix their codebase to
get it merged upstream to stop the huge
blockage that they have now caused in a
large number of embedded Linux
hardware companies […] But I need the
help of the Google developers to make it
happen, without them, nothing can
change.
http://www.kroah.com/log/linux/android-kernel-problems.html
3
Greg
Kroah-Hartman
Friday, 18 April, 14

4. Our Approach
Understand how
does integration
work?
Analyze why
integration fails?
Propose solution
to integration
issues.
4
Friday, 18 April, 14

5. 5
linux-usb
linux-scsi
lkml
linux 3.5
subsystem
maintainer1
subsystem
maintainer1
Reviewing Integration Staging
maintainer Linus Torvalds
Case study: Linux Kernel
contributor
contributor
contributor
Friday, 18 April, 14

6. Few Patches Get In!
Long Integration Time!
2005 2006 2007 2008 2009 2010 2011 2012
accepted/rejected patches
year
percentageofpatches
0
20000
40000
60000
80000
100000
120000
28.63
28.7
27.03
32.83 32.79 33.87
33.55
30.74
71.37
71.3
72.97
67.17
67.21 66.13
66.45
69.26
% accepted by linus
% rejected by linus
33% of patches make it!
2005 2006 2007 2008 2009 2010 2011 2012
year
percentageofacceptedpatchesofeachyear
020406080
instantly
within_hour
within_day
within_week
within_month
within_quarter
within_half_year
within_year
took_ages
Integration requiring
1~6months!
6
Friday, 18 April, 14

7. reviewing history
Tracking Evolution
Process of the Patch
7
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8. It takes 25% of patches
more than 4 weeks to be reviewed!
8
response_time (day) 0.871 1.131 1.030
first_response_time (day) 0.801 1.215 1.010
Patch
size 81.660 146.100 25.430
spread 2.398 3.811 1.016
spread_subsys 1.387 1.750 1.003
Other
acceptance 46.05% 43.97% 23.26%
bug-fix 49.94% 36.72% 31.10%
Table 5: Time duration (#days) of the super-
threads of type MM.
time duration # of patch versions
Min. 0 2.000
1st Qu. 2.687 2.000
Median 10.061 2.000
Mean 21.341 3.172
3rd Qu. 32.923 3.000
Max. 107.524 108.000
Friday, 18 April, 14

9. 9
linux-usb
linux-scsi
lkml
linux 3.5
subsystem
maintainer1
subsystem
maintainer1
Reviewing Integration Staging
maintainer Linus Torvalds
Figure out the
Integration Black-box!
contributor
contributor
contributor
Friday, 18 April, 14

10. Does it have external
dependencies?
How much effort
do I need to pay?
Is this integration
worth the effort?
What will this
integration change?
Will it cause
further risk?
....... integrator
Propose Solution to
Improve Integration
10
Friday, 18 April, 14

11. ISOMO:
Integration of
Software cOst
MOdel
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12. ISOMO: Quantify the
Cost of Integration
Merge Cost
Update Cost
Maintenance Cost
Removal Cost
ISOMO
12
Friday, 18 April, 14