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CPU session: apply quota via relative weightings

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Physical CPU quota was previously given to a thread on construction only
by directly specifying a percentage of the quota of the according CPU
session. Now, a new thread is given a weighting that can be any value.
The physical counter-value of such a weighting depends on the weightings
of the other threads at the CPU session. Thus, the physical quota of all
threads of a CPU session must be updated when a weighting is added or
removed. This is each time the session creates or destroys a thread.

This commit also adapts the "cpu_quota" test in base-hw accordingly.

Ref #1464
This commit is contained in:
Martin Stein
2015-03-27 14:05:55 +01:00
committed by Christian Helmuth
parent 955977b516
commit c9272937e7
71 changed files with 1230 additions and 483 deletions
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4
repos/base-linux/src/base/env/platform_env.h vendored
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@ -44,10 +44,10 @@ struct Genode::Expanding_cpu_session_client
Expanding_cpu_session_client(Genode::Capability<Linux_cpu_session> cap)
: Upgradeable_client<Genode::Linux_cpu_session_client>(cap) { }
Thread_capability create_thread(size_t, Name const &name, addr_t utcb)
Thread_capability create_thread(size_t weight, Name const &name, addr_t utcb)
{
return retry<Cpu_session::Out_of_metadata>(
[&] () { return Linux_cpu_session_client::create_thread(0, name, utcb); },
[&] () { return Linux_cpu_session_client::create_thread(weight, name, utcb); },
[&] () { upgrade_ram(8*1024); });
}
};