genode/repos/os/include/loader_session/connection.h

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/*
* \brief Connection to Loader service
* \author Christian Prochaska
* \author Norman Feske
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* \date 2009-10-05
*/
/*
* Copyright (C) 2009-2017 Genode Labs GmbH
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*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
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*/
#ifndef _INCLUDE__LOADER_SESSION__CONNECTION_H_
#define _INCLUDE__LOADER_SESSION__CONNECTION_H_
#include <loader_session/client.h>
#include <base/connection.h>
namespace Loader { struct Connection; }
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struct Loader::Connection : Genode::Connection<Session>, Session_client
{
Capability quota accounting and trading 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
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Connection(Genode::Env &env, Ram_quota ram_quota, Cap_quota cap_quota)
:
Genode::Connection<Session>(env, Label(), ram_quota, Args()),
Session_client(cap())
{
upgrade_caps(cap_quota.value);
}
};
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#endif /* _INCLUDE__LOADER_SESSION__CONNECTION_H_ */