scx_loader: A DBUS Interface for Managing sched-ext Schedulers

scx_loader is a utility that provides a convenient DBUS interface for starting, stopping, and managing sched_ext schedulers.

Features

• StartScheduler Method: Launches a scheduler specified by its scx_name (e.g., "scx_rusty") and a scheduler mode (profile) represented as an unsigned integer.
• StartSchedulerWithArgs Method: Starts a scheduler with its scx_name and allows passing arbitrary CLI arguments directly to the scheduler.
• StopScheduler Method: Terminates the currently running scheduler.
• CurrentScheduler Property: Returns the scx_name of the active scheduler or "unknown" if none is running.
• SchedulerMode Property: Provides information about the currently active scheduler's mode (profile).
• SupportedSchedulers Property: Lists the schedulers currently supported by scx_loader.

Usage

scx_loader interacts with schedulers through its DBUS interface. You can use tools like dbus-send or gdbus to communicate with it.

Examples using dbus-send:

• Start a Scheduler:

  dbus-send --system --print-reply --dest=org.scx.Loader /org/scx/Loader org.scx.Loader.StartScheduler string:scx_rusty uint32:0
  

  (This starts scx_rusty with scheduler mode 0)

• Start a Scheduler with Arguments:

  dbus-send --system --print-reply --dest=org.scx.Loader /org/scx/Loader org.scx.Loader.StartSchedulerWithArgs string:scx_bpfland array:string:"-k","-c","0"
  

  (This starts scx_bpfland with arguments -k -c 0)

• Stop the Current Scheduler:

  dbus-send --system --print-reply --dest=org.scx.Loader /org/scx/Loader org.scx.Loader.StopScheduler
  

• Get the Currently Active Scheduler:

  dbus-send --system --print-reply --dest=org.scx.Loader /org/scx/Loader org.freedesktop.DBus.Properties.Get string:org.scx.Loader string:CurrentScheduler
  

• Get the Supported Schedulers:

  dbus-send --system --print-reply --dest=org.scx.Loader /org/scx/Loader org.freedesktop.DBus.Properties.Get string:org.scx.Loader string:SupportedSchedulers
  

Note: Replace the example scheduler names and arguments with the actual ones you want to use.

Development Status

scx_loader is under active development. Future improvements may include:

• More robust error handling.
• Configuration file.