Test for yielding resources
This commit is contained in:
Norman Feske
parent
9cf677cb0a
commit
d78ba43f64
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build "core init test/resource_yield drivers/timer"
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create_boot_directory
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install_config {
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<config>
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<parent-provides>
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<service name="ROM"/>
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<service name="RAM"/>
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<service name="CPU"/>
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<service name="RM"/>
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<service name="CAP"/>
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<service name="PD"/>
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<service name="IRQ"/>
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<service name="IO_PORT"/>
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<service name="IO_MEM"/>
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<service name="SIGNAL"/>
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<service name="LOG"/>
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</parent-provides>
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<default-route>
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<any-service> <parent/> <any-child/> </any-service>
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</default-route>
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<start name="timer">
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<resource name="RAM" quantum="1M"/>
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<provides><service name="Timer"/></provides>
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</start>
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<start name="test-resource_yield">
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<resource name="RAM" quantum="16M"/>
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<provides> <service name="ROM" /> </provides>
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</start>
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</config>
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}
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build_boot_image "core init timer test-resource_yield"
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append qemu_args "-nographic -m 64"
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run_genode_until {--- test-resource_yield finished ---\s*\n} 50
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puts "Test succeeded"
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/*
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* \brief Test for yielding resources
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* \author Norman Feske
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* \date 2013-10-05
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*
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* This test exercises the protocol between a parent and child, which is used
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* by the parent to regain resources from a child subsystem.
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*
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* The program acts in either one of two roles, the parent or the child. The
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* role is determined by reading a config argument.
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*
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* The child periodically allocates chunks of RAM until its RAM quota is
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* depleted. Once it observes a yield request from the parent, however, it
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* cooperatively releases as much resources as requested by the parent.
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*
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* The parent wait a while to give the child the chance to allocate RAM. It
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* then sends a yield request and waits for a response. When getting the
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* response, it validates whether the child complied to the request or not.
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*/
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/*
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* Copyright (C) 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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/* Genode includes */
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#include <util/arg_string.h>
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#include <base/printf.h>
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#include <base/signal.h>
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#include <cap_session/connection.h>
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#include <timer_session/connection.h>
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#include <os/config.h>
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#include <os/slave.h>
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/****************
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** Child role **
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****************/
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/**
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* The child eats more and more RAM. However, when receiving a yield request,
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* it releases the requested amount of resources.
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*/
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class Child
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{
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private:
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typedef Genode::size_t size_t;
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struct Ram_chunk : Genode::List<Ram_chunk>::Element
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{
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size_t const size;
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Genode::Ram_dataspace_capability ds_cap;
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Ram_chunk(size_t size)
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:
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size(size),
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ds_cap(Genode::env()->ram_session()->alloc(size))
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{ }
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~Ram_chunk()
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{
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Genode::env()->ram_session()->free(ds_cap);
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}
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};
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bool const _expand;
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Genode::List<Ram_chunk> _ram_chunks;
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Timer::Connection _timer;
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Genode::Signal_receiver _sig_rec;
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Genode::Signal_dispatcher<Child> _periodic_timeout_dispatcher;
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Genode::Signal_dispatcher<Child> _yield_dispatcher;
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unsigned long const _period_ms;
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void _dispatch_periodic_timeout(unsigned);
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void _dispatch_yield(unsigned);
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void _schedule_next_timeout()
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{
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_timer.trigger_once(_period_ms*1000);
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}
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public:
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Child();
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void main();
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};
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void Child::_dispatch_periodic_timeout(unsigned)
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{
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size_t const chunk_size = 1024*1024;
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if (Genode::env()->ram_session()->avail() < chunk_size) {
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if (_expand) {
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PLOG("quota consumed, request additional resources");
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/*
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* The attempt to allocate RAM will result in a resource request to
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* the parent. The resource request will block until the parent
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* responds.
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*/
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} else {
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PLOG("consumed all of our quota, stop allocating");
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return;
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}
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}
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/* perform allocation and remember chunk in list */
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_ram_chunks.insert(new (Genode::env()->heap()) Ram_chunk(chunk_size));
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PLOG("allocated chunk of %zd KiB", chunk_size / 1024);
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_schedule_next_timeout();
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}
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void Child::_dispatch_yield(unsigned)
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{
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using namespace Genode;
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/* request yield request arguments */
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Parent::Resource_args const args = env()->parent()->yield_request();
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PLOG("yield request: %s", args.string());
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size_t const requested_ram_quota =
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Arg_string::find_arg(args.string(), "ram_quota").ulong_value(0);
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/* free chunks of RAM to comply with the request */
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size_t released_quota = 0;
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while (released_quota < requested_ram_quota) {
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Ram_chunk *chunk = _ram_chunks.first();
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if (!chunk) {
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PWRN("no chunk left to release");
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break;
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}
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size_t const chunk_size = chunk->size;
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_ram_chunks.remove(chunk);
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destroy(env()->heap(), chunk);
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released_quota += chunk_size;
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PLOG("released chunk of %zd bytes", chunk_size);
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}
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/* acknowledge yield request */
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env()->parent()->yield_response();
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_schedule_next_timeout();
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}
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static inline unsigned long read_period_ms_from_config()
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{
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unsigned long period_ms = 500;
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if (Genode::config()->xml_node().has_attribute("period_ms"))
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Genode::config()->xml_node().attribute("period_ms").value(&period_ms);
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return period_ms;
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}
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Child::Child()
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:
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_expand(Genode::config()->xml_node().has_attribute("expand")
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&& Genode::config()->xml_node().attribute("expand").has_value("yes")),
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_periodic_timeout_dispatcher(_sig_rec, *this,
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&Child::_dispatch_periodic_timeout),
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_yield_dispatcher(_sig_rec, *this,
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&Child::_dispatch_yield),
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_period_ms(read_period_ms_from_config())
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{
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/* register yield signal handler */
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Genode::env()->parent()->yield_sigh(_yield_dispatcher);
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/* register timeout signal handler and schedule periodic timeouts */
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_timer.sigh(_periodic_timeout_dispatcher);
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_schedule_next_timeout();
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}
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void Child::main()
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{
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using namespace Genode;
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for (;;) {
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Signal sig = _sig_rec.wait_for_signal();
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Signal_dispatcher_base *dispatcher =
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dynamic_cast<Signal_dispatcher_base *>(sig.context());
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if (dispatcher)
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dispatcher->dispatch(sig.num());
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}
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}
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/*****************
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** Parent role **
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*****************/
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/**
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* The parent grants resource requests as long as it has free resources.
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* Once in a while, it politely requests the child to yield resources.
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*/
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class Parent : Genode::Slave_policy
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{
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private:
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/**
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* Return singleton entrypoint instance
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*
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* The entrypoint cannot be a regular member because we need to pass
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* it into the constructor of the 'Slave_policy' base class.
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*/
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static Genode::Rpc_entrypoint &_entrypoint();
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typedef Genode::size_t size_t;
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size_t const slave_quota = 10*1024*1024;
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Genode::Slave _slave = { _entrypoint(), *this, slave_quota };
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Timer::Connection _timer;
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Genode::Lock _yield_blockade;
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void _print_status()
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{
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PLOG("quota: %zd KiB used: %zd KiB",
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_slave.ram().quota() / 1024,
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_slave.ram().used() / 1024);
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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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Parent()
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:
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Genode::Slave_policy("test-resource_yield", _entrypoint(),
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Genode::env()->ram_session()),
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_yield_blockade(Genode::Lock::LOCKED)
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{
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configure("<config child=\"yes\" />");
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}
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int main();
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/****************************
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** Slave_policy interface **
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****************************/
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char const **_permitted_services() const
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{
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static char const *services[] = { "RM", "SIGNAL", "LOG", "Timer" };
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return services;
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}
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void yield_response()
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{
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_yield_blockade.unlock();
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}
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};
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Genode::Rpc_entrypoint &Parent::_entrypoint()
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{
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using namespace Genode;
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static Cap_connection cap;
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size_t const stack_size = sizeof(addr_t)*1024;
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static Rpc_entrypoint ep(&cap, stack_size, "ep", false);
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return ep;
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}
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int Parent::main()
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{
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using namespace Genode;
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_entrypoint().activate();
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/* perform the test three times */
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for (unsigned j = 0; j < 3; j++) {
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/* wait five seconds and observe growth of resource usage */
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for (unsigned i = 0; i < 5; i++) {
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_timer.msleep(1000);
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_print_status();
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}
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/* remember quantum of resources used by the child */
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size_t const used_prior_yield = _slave.ram().used();
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/* issue yield request */
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Genode::Parent::Resource_args yield_args("ram_quota=5M");
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_slave.yield(yield_args);
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/*
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* Synchronously wait for a yield response. Note that a careful parent
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* would never trust its child to comply to the yield request.
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*/
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PLOG("wait for yield response");
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_yield_blockade.lock();
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PLOG("got yield response");
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_print_status();
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/* validate that the amount of yielded resources matches the request */
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size_t const used_after_yield = _slave.ram().used();
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if (used_after_yield + 5*1024*1024 > used_prior_yield) {
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PERR("child has not yielded enough resources");
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return -1;
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}
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}
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printf("--- test-resource_yield finished ---\n");
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return 0;
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}
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/******************
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** Main program **
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******************/
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int main(int argc, char **argv)
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{
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using namespace Genode;
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/*
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* Read value '<config child="" />' attribute to decide whether to perform
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* the child or the parent role.
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*/
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bool const is_child = config()->xml_node().has_attribute("child")
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&& config()->xml_node().attribute("child").has_value("yes");
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if (is_child) {
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printf("--- test-resource_yield child role started ---\n");
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static ::Child child;
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child.main();
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return -1; /* the child should never reach this point */
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} else {
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printf("--- test-resource_yield parent role started ---\n");
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static ::Parent parent;
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return parent.main();
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}
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}
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@ -0,0 +1,3 @@
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TARGET = test-resource_yield
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SRC_CC = main.cc
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LIBS = base config
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@ -30,3 +30,4 @@ affinity
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mp_server
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seoul-auto
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resource_request
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resource_yield
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