Memory Efficient GNOME Architecture Tommi Komulainen <tommi.komulainen@nokia.com>

Tommi Komulainen <tommi.komulainen@nokia.com>

Outline Problems Solving the problems in Maemo

Problems

Solving the problems in Maemo

Problems Processes, processes, processes... Data duplication

Processes, processes, processes...

Data duplication

Processes System services dbus-daemon, dbus-daemon, gconfd-2, gnome-vfs-daemon, ... Applets Home (5+1), Task Navigator (4), Status bar (5+2) Applications Short-lived message passing

System services

dbus-daemon, dbus-daemon, gconfd-2, gnome-vfs-daemon, ...

Applets

Home (5+1), Task Navigator (4), Status bar (5+2)

Applications

Short-lived message passing

Data duplication Memory structures re-created in every application GObject classes, fonts, gtkrc ...from data that hardly ever changes Tools lacking

Memory structures re-created in every application

GObject classes, fonts, gtkrc

...from data that hardly ever changes

Tools lacking

Solving the problems in Maemo In-process applets Every application is a D-BUS service maemo-launcher Background killing applications

In-process applets

Every application is a D-BUS service

maemo-launcher

Background killing applications

In-process applets Crashing is not an option!

Crashing is not an option!

Every application is a D-BUS service One IPC to rule them all Single-instance [Desktop Entry] Type=Application Name=Web Exec=/usr/bin/browser X-Osso-Service=com.nokia.osso_browser

One IPC to rule them all

Single-instance

[Desktop Entry] Type=Application Name=Web Exec=/usr/bin/browser X-Osso-Service=com.nokia.osso_browser

Maemo-launcher Copy-on-write hack for reducing the process overhead

Copy-on-write hack for reducing the process overhead

Background killing applications State saving Session Management on application level

State saving

Session Management on application level

Conclusion

Questions? Comments, flames, beer?

Comments, flames, beer?