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In the init configuration one can configure the donation of CPU time via 'resource' tags that have the attribute 'name' set to "CPU" and the attribute 'quantum' set to the percentage of CPU quota that init shall donate. The pattern is the same as when donating RAM quota. ! <start name="test"> ! <resource name="CPU" quantum="75"/> ! </start> This would cause init to try donating 75% of its CPU quota to the child "test". Init and core do not preserve CPU quota for their own requirements by default as it is done with RAM quota. The CPU quota that a process owns can be applied through the thread constructor. The constructor has been enhanced by an argument that indicates the percentage of the programs CPU quota that shall be granted to the new thread. So 'Thread(33, "test")' would cause the backing CPU session to try to grant 33% of the programs CPU quota to the thread "test". By now, the CPU quota of a thread can't be altered after construction. Constructing a thread with CPU quota 0 doesn't mean the thread gets never scheduled but that the thread has no guaranty to receive CPU time. Such threads have to live with excess CPU time. Threads that already existed in the official repositories of Genode were adapted in the way that they receive a quota of 0. This commit also provides a run test 'cpu_quota' in base-hw (the only kernel that applies the CPU-quota scheme currently). The test basically runs three threads with different physical CPU quota. The threads simply count for 30 seconds each and the test then checks wether the counter values relate to the CPU-quota distribution. fix #1275 |
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This repository contains the Qt4 toolkit für Genode Qt4 is a tool kit for developing platform-independent applications. It comprises a complete platform-abstraction layer and a rich GUI tool kit. With this repository, native Qt4 applications can be compiled and natively executed for the Genode OS Framework. This way, Qt4 becomes available on all base platforms supported by Genode. Usage ----- For using Qt4 for your Genode applications, you first need to download and prepare the original Qt4 source codes and build a few Qt4 tools such as the meta-object compiler (moc) and the resource compiler. The top-level makefile found in this directory automates this task. Just issue: ! make prepare To include the 'qt4' repository into the Genode build process, add the 'qt4/' directory to the 'REPOSITORIES' declaration of the 'etc/build.conf' file within your build directory. Since the Genode release 9.11, Qt4 depends on the 'libports' repository, specifically on the 'freetype2' and 'jpeg' libraries. Please make sure that you called the top-level Makefile of the 'libports' repository for those preparing those libraries and that your 'REPOSITORIES' declaration contains the 'libports' repository.