This change allows for the testing of cli_monitor's automatic resource
balancing by executing the following command:
start ram_eater --ram-limit 1G --count 5
The command starts 5 instances of a RAM-eating process, which is,
however, able to yield resources when instructed. The RAM quota for the
processes gets automatically extended because of the overly large limit
of 1 GiB, which is far more than CLI monitor's RAM resources (100 MiB).
When the RAM usage hits the preservation limit, CLI monitor broadcasts
yield requests to each ram_eater instance, which allow the scenario to
remain alive.
This patch introduces new commands for dynamically balancing RAM between
subsystems. The 'status' command prints a table with the RAM status of
each subsystem. The 'ram' command changes the quota or a quota limit of
a given subsystem. The quota limit can be defined to allow the on-demand
expansion of the quota. Finally, the 'yield' command can be used to
instruct a subsystem to yield a specified amount of resources.
For trying out the new commands, a so-called 'ram_eater' example has
been added to the 'terminal_mux.run' scenario. This program simulates a
subsystem with a growing demand for resources, yet with the capability
to yield resources when instructed by the parent (i.e., cli_monitor).
Besides implementing the new features, the patch splits the
implementation of 'cli_monitor' into multiple files.
This patch updates the launchpad config to use XML attributes and
removes the built-in default configuration (which is only meaningful
for demo.run anyway).
The new terminal_mux server is able to provide multiple terminal
sessions over one terminal-client session. The user can switch
between the different sessions using the keyboard shortcut C-y,
which brings up an ncurses-based menu.
This commit adds a terminal_log component, and a run-script which demonstrates
its usage. The terminal_log component provides the LOG service, and prints
every log-output prefixed by the session-label via a terminal-session.
The old variant provided 8K capability slots to all processes on core,
which increased binaries by 180 KB for the static allocator. I reduced it
to 4K capabilities stay under 100 KB overhead for the allocator.
Anyway, pci_drv and pl11x_drv need more RAM quota now: 2M for pl11x_drv
and 1M for pci_drv.
Stefan Kalkowski
Norman Feske
Alexander Boettcher
Christian Prochaska
Christian Helmuth
Genode Labs