Trying to reduce session footprint for better battery life and RAM usage

smem-raring list on 2013-01-16: https://wiki.ubuntu.com/Nexus7/Smem-2013-01-16

Notes

* update-notifier:
bdmurray - in addition to file monitoring update-notifier also checks for CDs with packages on them, monitors for devices requiring firmware, and checks for a new release of Ubuntu
http://wiki.ubuntu.com/UpdateNotifier

seb128 - it should be possible to change from a binary running all the time to one triggered by upstart on some condition, doing its work and exiting

bdmurray - ppa version of update-notifier with quite a few upstart user session jobs is available at https://launchpad.net/~brian-murray/+archive/ppa

* ubuntu-system-service/systemd:
dropped item to rewrite ubuntu-system-service Ubuntu specific interfaces in !python, that's already covered in https://blueprints.launchpad.net/ubuntu/+spec/desktop-r-ubuntu-system-services

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seb128, 2012-03-11: updated some items:
- dropped cups-on-demand items, it's covered by https://blueprints.launchpad.net/ubuntu/+spec/client-1303-printing-stack-with-mobile-in-mind
- dropped compiz work, we don't plan to spend more effort on compiz this cycle
- set "port to vala" items as postponed, there is no obvious target not individually listed at the moment

Work items:
[robert-ancell] look at why lightdm is using 30MB (it's due to the memory locking - without locking it drops to 3.7M) : DONE
[mterry] Make lightdm selectively lock memory instead of using mlockall: DONE
[canonical-desktop-team] go through the long running processes and run valgrind on them to assure we don't have obvious leaks: DONE
[seb128] look if gnome-keyring needs to be running all the time (needs to, restarting would mean having to unlock it again, e.g ask user for password every time): DONE
look if polkit-gnome-authentication needs to be running all the time: POSTPONED
[mhr3] make zg-fts expire datas after some time to reduce the size of the db: POSTPONED
[charles] valgrind the indicators stack: POSTPONED
look at making notify-osd exit on idle: DONE
[didrocks] talk to desrt and others about a "libidle" to use for "exit after idle": POSTPONED
[ken-vandine] check with online team if signond needs to be running all the time: DONE
[ken-vandine] investigate long running telepathy-indicator/mission-control: DONE
[ken-vandine] investigate long running geoclue/geoip services: POSTPONED
[charles] look at moving the eds/geoclue use in indicator-datetime from startup to about-to-show: POSTPONED
[seb128] talk to U1 guys about memory usage and disk wakes: POSTPONED
[seb128] look at what is making goa run for some users (it's e-d-s): DONE
change evolution-source-registry to not start goa under unity: POSTPONED
[laney] drop g-c-c recommends on goa so it's not installed by default: DONE
look at the dbus traffic and work to reduce it: POSTPONED
[seb128] provide a list/documentation for python processes that could be ported to C/vala/...: POSTPONED
[mhall119] engage with the community for the python->c/vala porting effort: POSTPONED
[ogra] seed zram-conf: DONE
[seb128] talk to the QA team about daily measurement: DONE
[seb128] look at the wakeups list and set work items for the main offenders: POSTPONED
[seb128] set up follow-up meetings about the topics we didn't cover during the session: DONE
[didrocks] look at what options are activated in compiz and not needed (reduce number of .so loaded by default): POSTPONED
[attente] rewrite unity-lens-photo in vala: POSTPONED
[stolowski] rewrite unity-lens-video in vala (lp:~stolowski/unity-lens-video/vala-rewrite): DONE
[ken-vandine] investigate long running signon-ui : DONE
[canonical-dx-team] rewrite unity-scope-video-remote in !python: POSTPONED
[canonical-dx-team] rewrite unity-scope-gdrive in !python: POSTPONED
review g-s-d components and which ones are needed or not needed: DONE
[seb128] run unity-panel-service under valgrind loading selectively one indicator at time (possible leak pointed on http://people.canonical.com/~j-lallement/N7/memusage/idle/unity-panel-ser.png): POSTPONED
replace ubuntu-system-services (python) by systemd helpers (C): DONE
[brian-murray] look at what update-notifier is used for nowadays, identify if those functionalities could be replaced/moved to upstart jobs [http://wiki.ubuntu.com/UpdateNotifier]: DONE
[brian-murray] change update-notifier to be running on demand, from an upstart job, does the action it has been called for and exit: POSTPONED
investigate if mousetweaks is useful/should be running on the nexus (it's not enabled by default so not an issue): DONE
[ev] Reduce memory usage of whoopsie: POSTPONED
investigate if we can make cups run on-demand (would require socket activation support in upstart? - upstart supports socket activation, so one only needs to update job file): POSTPONED
[larsu] investigate not running indicator-printer on systems without a printer configured: POSTPONED
[ted] teach hud-service to exit after an idle timeout: INPROGRESS
[cjwatson] fix upower memory leaks: DONE
[cjwatson] reduce update-notifier memory use: DONE