8f9355b360
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
84 lines
1.7 KiB
C++
84 lines
1.7 KiB
C++
/*
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* \brief IRQ handling utility
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* \author Christian Helmuth
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* \date 2011-05-19
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*/
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/*
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* Copyright (C) 2011-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__OS__IRQ_ACTIVATION_H_
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#define _INCLUDE__OS__IRQ_ACTIVATION_H_
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#include <base/thread.h>
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#include <base/snprintf.h>
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#include <irq_session/connection.h>
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namespace Genode {
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struct Irq_handler
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{
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/**
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* Called by IRQ activation on interrupt
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*/
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virtual void handle_irq(int irq_number) = 0;
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};
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/**
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* Thread activated by IRQ
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*/
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class Irq_activation : Thread_base
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{
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private:
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int _number;
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Irq_connection _connection;
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Irq_handler &_handler;
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char _thread_name[8];
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char const *_create_thread_name(unsigned irq_number)
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{
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snprintf(_thread_name, sizeof(_thread_name), "irq.%02x", irq_number);
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return _thread_name;
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}
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public:
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/**
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* Constructor
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*
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* \param irq_number interrupt number
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* \param handler interrupt handler
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* \param stack_size size of stack or interrupt thread
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*/
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Irq_activation(int irq_number, Irq_handler &handler, size_t stack_size)
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:
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Thread_base(0, _create_thread_name(irq_number), stack_size),
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_number(irq_number), _connection(irq_number), _handler(handler)
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{
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start();
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}
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/**
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* Thread entry function
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*
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* The interrupt thread infinitely waits for interrupts and calls
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* the handler on occurrence.
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*/
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void entry()
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{
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while (true) {
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_connection.wait_for_irq();
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_handler.handle_irq(_number);
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}
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}
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};
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}
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#endif /* _INCLUDE__OS__IRQ_ACTIVATION_H_ */
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