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Capability quota accounting and trading

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This patch mirrors the accounting and trading scheme that Genode employs
for physical memory to the accounting of capability allocations.

Capability quotas must now be explicitly assigned to subsystems by
specifying a 'caps=<amount>' attribute to init's start nodes.
Analogously to RAM quotas, cap quotas can be traded between clients and
servers as part of the session protocol. The capability budget of each
component is maintained by the component's corresponding PD session at
core.

At the current stage, the accounting is applied to RPC capabilities,
signal-context capabilities, and dataspace capabilities. Capabilities
that are dynamically allocated via core's CPU and TRACE service are not
yet covered. Also, the capabilities allocated by resource multiplexers
outside of core (like nitpicker) must be accounted by the respective
servers, which is not covered yet.

If a component runs out of capabilities, core's PD service prints a
warning to the log. To observe the consumption of capabilities per
component in detail, the PD service is equipped with a diagnostic
mode, which can be enabled via the 'diag' attribute in the target
node of init's routing rules. E.g., the following route enables the
diagnostic mode for the PD session of the "timer" component:

  <default-route>
    <service name="PD" unscoped_label="timer">
      <parent diag="yes"/>
    </service>
    ...
  </default-route>

For subsystems based on a sub-init instance, init can be configured
to report the capability-quota information of its subsystems by
adding the attribute 'child_caps="yes"' to init's '<report>'
config node. Init's own capability quota can be reported by adding
the attribute 'init_caps="yes"'.

Fixes #2398
This commit is contained in:
Norman Feske
2017-05-08 21:35:43 +02:00
committed by Christian Helmuth
parent 773e08976d
commit 1f4f119b1e
105 changed files with 1494 additions and 405 deletions
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25
repos/base-nova/src/lib/base/rpc_cap_alloc.cc
View File

@ -34,18 +34,23 @@ Native_capability Rpc_entrypoint::_alloc_rpc_cap(Pd_session &pd, Native_capabili
Nova_native_pd_client native_pd(_native_pd_cap);
Untyped_capability new_obj_cap =
retry<Genode::Pd_session::Out_of_metadata>(
[&] () {
return native_pd.alloc_rpc_cap(ep, entry, 0);
},
[&] () {
internal_env().upgrade(Parent::Env::pd(), "ram_quota=16K");
});
for (;;) {
native_pd.imprint_rpc_cap(new_obj_cap, new_obj_cap.local_name());
Ram_quota ram_upgrade { 0 };
Cap_quota cap_upgrade { 0 };
return new_obj_cap;
try {
Untyped_capability new_obj_cap = native_pd.alloc_rpc_cap(ep, entry, 0);
native_pd.imprint_rpc_cap(new_obj_cap, new_obj_cap.local_name());
return new_obj_cap;
}
catch (Out_of_ram) { ram_upgrade = Ram_quota { 2*1024*sizeof(long) }; }
catch (Out_of_caps) { cap_upgrade = Cap_quota { 4 }; }
env_deprecated()->parent()->upgrade(Parent::Env::pd(),
String<100>("ram_quota=", ram_upgrade, ", "
"cap_quota=", cap_upgrade).string());
}
}