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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
Download Patch File Download Diff File Expand all files Collapse all files

12
repos/os/src/server/loader/child.h
View File

@ -45,6 +45,7 @@ class Loader::Child : public Child_policy
Session_label const _label;
Name const _binary_name;
Cap_quota const _cap_quota;
Ram_quota const _ram_quota;
Parent_services &_parent_services;
@ -62,6 +63,7 @@ class Loader::Child : public Child_policy
Allocator &alloc,
Name const &binary_name,
Session_label const &label,
Cap_quota cap_quota,
Ram_quota ram_quota,
Parent_services &parent_services,
Service &local_rom_service,
@ -74,6 +76,7 @@ class Loader::Child : public Child_policy
_alloc(alloc),
_label(label),
_binary_name(binary_name),
_cap_quota(Genode::Child::effective_quota(cap_quota)),
_ram_quota(Genode::Child::effective_quota(ram_quota)),
_parent_services(parent_services),
_local_nitpicker_service(local_nitpicker_service),
@ -94,9 +97,18 @@ class Loader::Child : public Child_policy
Binary_name binary_name() const override { return _binary_name; }
Pd_session &ref_pd() override { return _env.pd(); }
Pd_session_capability ref_pd_cap() const override { return _env.pd_session_cap(); }
Ram_session &ref_ram() override { return _env.ram(); }
Ram_session_capability ref_ram_cap() const override { return _env.ram_session_cap(); }
void init(Pd_session &pd, Pd_session_capability pd_cap) override
{
pd.ref_account(ref_pd_cap());
ref_pd().transfer_quota(pd_cap, _cap_quota);
}
void init(Ram_session &ram, Ram_session_capability ram_cap) override
{
ram.ref_account(ref_ram_cap());

22
repos/os/src/server/loader/main.cc
View File

@ -14,7 +14,6 @@
/* Genode includes */
#include <base/component.h>
#include <base/heap.h>
#include <base/rpc_server.h>
#include <base/sleep.h>
#include <loader_session/loader_session.h>
#include <root/component.h>
@ -204,9 +203,11 @@ class Loader::Session_component : public Rpc_object<Session>
Env &_env;
Session_label const _label;
Xml_node const _config;
Cap_quota const _cap_quota;
Ram_quota const _ram_quota;
Ram_session_client_guard _local_ram { _env.ram_session_cap(), _ram_quota };
Heap _md_alloc { _local_ram, _env.rm() };
size_t _subsystem_cap_quota_limit = 0;
size_t _subsystem_ram_quota_limit = 0;
Parent_services _parent_services;
Rom_module_registry _rom_modules { _env, _config, _local_ram, _md_alloc };
@ -243,10 +244,11 @@ class Loader::Session_component : public Rpc_object<Session>
/**
* Constructor
*/
Session_component(Env &env, Session_label const &label,
Xml_node config, Ram_quota quota)
Session_component(Env &env, Session_label const &label, Xml_node config,
Cap_quota cap_quota, Ram_quota ram_quota)
:
_env(env), _label(label), _config(config), _ram_quota(quota)
_env(env), _label(label), _config(config),
_cap_quota(cap_quota), _ram_quota(ram_quota)
{
/* fetch all parent-provided ROMs according to the config */
config.for_each_sub_node("parent-rom", [&] (Xml_node rom)
@ -287,6 +289,11 @@ class Loader::Session_component : public Rpc_object<Session>
throw Rom_module_does_not_exist(); }
}
void cap_quota(Cap_quota caps) override
{
_subsystem_cap_quota_limit = caps.value;
}
void ram_quota(Ram_quota quantum) override
{
_subsystem_ram_quota_limit = quantum.value;
@ -334,6 +341,10 @@ class Loader::Session_component : public Rpc_object<Session>
return;
}
size_t const cap_quota = (_subsystem_cap_quota_limit > 0)
? min(_subsystem_cap_quota_limit, _cap_quota.value)
: _cap_quota.value;
size_t const ram_quota = (_subsystem_ram_quota_limit > 0)
? min(_subsystem_ram_quota_limit, _ram_quota.value)
: _ram_quota.value;
@ -341,7 +352,7 @@ class Loader::Session_component : public Rpc_object<Session>
try {
_child.construct(_env, _md_alloc, binary_name.string(),
prefixed_label(_label, Session_label(label.string())),
Ram_quota{ram_quota},
Cap_quota{cap_quota}, Ram_quota{ram_quota},
_parent_services, _rom_service,
_cpu_service, _pd_service, _nitpicker_service,
_fault_sigh);
@ -381,6 +392,7 @@ class Loader::Root : public Root_component<Session_component>
catch (...) { }
return new (md_alloc()) Session_component(_env, label, session_config,
cap_quota_from_args(args),
ram_quota_from_args(args));
}