mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-28 01:28:53 +00:00
343 lines
9.2 KiB
C++
343 lines
9.2 KiB
C++
/*
|
|
* \brief Child handling
|
|
* \author Norman Feske
|
|
* \date 2013-10-05
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2013 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__CLI_MONITOR__CHILD_H_
|
|
#define _INCLUDE__CLI_MONITOR__CHILD_H_
|
|
|
|
/* Genode includes */
|
|
#include <util/list.h>
|
|
#include <base/child.h>
|
|
#include <init/child_policy.h>
|
|
#include <os/child_policy_dynamic_rom.h>
|
|
#include <cpu_session/connection.h>
|
|
#include <pd_session/connection.h>
|
|
#include <base/session_label.h>
|
|
|
|
/* CLI-monitor includes */
|
|
#include <cli_monitor/ram.h>
|
|
|
|
|
|
class Child_base : public Genode::Child_policy
|
|
{
|
|
public:
|
|
|
|
/*
|
|
* XXX derive donated quota from information to be provided by
|
|
* the used 'Connection' interfaces
|
|
*/
|
|
enum { DONATED_RAM_QUOTA = 128*1024 };
|
|
|
|
class Quota_exceeded : public Genode::Exception { };
|
|
|
|
typedef Genode::size_t size_t;
|
|
|
|
private:
|
|
|
|
Ram &_ram;
|
|
|
|
Genode::Session_label const _label;
|
|
|
|
size_t _ram_quota;
|
|
size_t _ram_limit;
|
|
|
|
struct Resources
|
|
{
|
|
Genode::Pd_connection pd;
|
|
Genode::Ram_connection ram;
|
|
Genode::Cpu_connection cpu;
|
|
|
|
Resources(const char *label, Genode::size_t ram_quota)
|
|
: pd(label), ram(label), cpu(label)
|
|
{
|
|
if (ram_quota > DONATED_RAM_QUOTA)
|
|
ram_quota -= DONATED_RAM_QUOTA;
|
|
else
|
|
throw Quota_exceeded();
|
|
ram.ref_account(Genode::env()->ram_session_cap());
|
|
if (Genode::env()->ram_session()->transfer_quota(ram.cap(), ram_quota) != 0)
|
|
throw Quota_exceeded();
|
|
}
|
|
} _resources;
|
|
|
|
Genode::Child::Initial_thread _initial_thread { _resources.cpu, _resources.pd,
|
|
_label.string() };
|
|
|
|
Genode::Region_map_client _address_space { _resources.pd.address_space() };
|
|
Genode::Service_registry _parent_services;
|
|
Genode::Rom_connection _binary_rom;
|
|
|
|
enum { ENTRYPOINT_STACK_SIZE = 12*1024 };
|
|
Genode::Rpc_entrypoint _entrypoint;
|
|
|
|
Init::Child_policy_enforce_labeling _labeling_policy;
|
|
Init::Child_policy_provide_rom_file _binary_policy;
|
|
Genode::Child_policy_dynamic_rom_file _config_policy;
|
|
Genode::Child _child;
|
|
|
|
/**
|
|
* If set to true, immediately withdraw resources yielded by the child
|
|
*/
|
|
bool _withdraw_on_yield_response = false;
|
|
|
|
/**
|
|
* Arguments of current resource request from the child
|
|
*/
|
|
Genode::Parent::Resource_args _resource_args;
|
|
|
|
Genode::Signal_context_capability _yield_response_sigh_cap;
|
|
|
|
Genode::Signal_context_capability _exit_sig_cap;
|
|
|
|
/* true if child is scheduled for destruction */
|
|
bool _exited = false;
|
|
|
|
public:
|
|
|
|
Child_base(Ram &ram,
|
|
char const *label,
|
|
char const *binary,
|
|
Genode::Cap_session &cap_session,
|
|
Genode::size_t ram_quota,
|
|
Genode::size_t ram_limit,
|
|
Genode::Signal_context_capability yield_response_sig_cap,
|
|
Genode::Signal_context_capability exit_sig_cap,
|
|
Genode::Dataspace_capability ldso_ds)
|
|
:
|
|
_ram(ram),
|
|
_label(label),
|
|
_ram_quota(ram_quota),
|
|
_ram_limit(ram_limit),
|
|
_resources(_label.string(), _ram_quota),
|
|
_binary_rom(Genode::prefixed_label(Genode::Session_label(label),
|
|
Genode::Session_label(binary)).string()),
|
|
_entrypoint(&cap_session, ENTRYPOINT_STACK_SIZE, _label.string(), false),
|
|
_labeling_policy(_label.string()),
|
|
_binary_policy("binary", _binary_rom.dataspace(), &_entrypoint),
|
|
_config_policy("config", _entrypoint, &_resources.ram),
|
|
_child(_binary_rom.dataspace(), ldso_ds, _resources.pd, _resources.pd,
|
|
_resources.ram, _resources.ram, _resources.cpu, _initial_thread,
|
|
*Genode::env()->rm_session(), _address_space,
|
|
_entrypoint, *this),
|
|
_yield_response_sigh_cap(yield_response_sig_cap),
|
|
_exit_sig_cap(exit_sig_cap)
|
|
{ }
|
|
|
|
Genode::Session_label label() const { return _label; }
|
|
|
|
void configure(char const *config, size_t config_len)
|
|
{
|
|
_config_policy.load(config, config_len);
|
|
}
|
|
|
|
void start()
|
|
{
|
|
_entrypoint.activate();
|
|
}
|
|
|
|
/**
|
|
* Issue yield request to the child
|
|
*/
|
|
void yield(size_t amount, bool greedy)
|
|
{
|
|
if (requested_ram_quota())
|
|
return; /* resource request in flight */
|
|
|
|
char buf[128];
|
|
Genode::snprintf(buf, sizeof(buf), "ram_quota=%ld", amount);
|
|
_withdraw_on_yield_response = greedy;
|
|
_child.yield(buf);
|
|
}
|
|
|
|
/**
|
|
* Return amount of RAM currently requested by the child
|
|
*/
|
|
size_t requested_ram_quota() const
|
|
{
|
|
return Genode::Arg_string::find_arg(_resource_args.string(), "ram_quota").ulong_value(0);
|
|
}
|
|
|
|
/**
|
|
* Withdraw quota from the child
|
|
*
|
|
* \throw Ram::Transfer_quota_failed
|
|
*/
|
|
void withdraw_ram_quota(size_t amount)
|
|
{
|
|
if (!amount)
|
|
return;
|
|
|
|
_ram.withdraw_from(_resources.ram.cap(), amount);
|
|
_ram_quota -= amount;
|
|
}
|
|
|
|
/**
|
|
* Upgrade quota of child
|
|
*
|
|
* \throw Ram::Transfer_quota_failed
|
|
*/
|
|
void upgrade_ram_quota(size_t amount)
|
|
{
|
|
_ram.transfer_to(_resources.ram.cap(), amount);
|
|
_ram_quota += amount;
|
|
|
|
/* wake up child if resource request is in flight */
|
|
size_t const req = requested_ram_quota();
|
|
if (req && _resources.ram.avail() >= req) {
|
|
_child.notify_resource_avail();
|
|
|
|
/* clear request state */
|
|
_resource_args = Genode::Parent::Resource_args("");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Try to respond to a current resource request issued by the child
|
|
*
|
|
* This method evaluates the conditions, under which a resource
|
|
* request can be answered: There must be enough room between the
|
|
* current quota and the configured limit, and there must be enough
|
|
* slack memory available. If both conditions are met, the quota
|
|
* of the child gets upgraded.
|
|
*/
|
|
void try_response_to_resource_request()
|
|
{
|
|
size_t const req = requested_ram_quota();
|
|
|
|
if (!req)
|
|
return; /* no resource request in flight */
|
|
|
|
/*
|
|
* Respond to the current request if the requested quota fits
|
|
* within the limit and if there is enough free quota available.
|
|
*/
|
|
if (req <= _ram.status().avail && req + _ram_quota <= _ram_limit) {
|
|
try { upgrade_ram_quota(req); }
|
|
catch (Ram::Transfer_quota_failed) { }
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set limit for on-demand RAM quota expansion
|
|
*/
|
|
void ram_limit(size_t limit)
|
|
{
|
|
_ram_limit = limit;
|
|
try_response_to_resource_request();
|
|
}
|
|
|
|
struct Ram_status
|
|
{
|
|
size_t quota = 0, limit = 0, xfer = 0, used = 0, avail = 0, req = 0;
|
|
|
|
Ram_status() { }
|
|
Ram_status(size_t quota, size_t limit, size_t xfer, size_t used,
|
|
size_t avail, size_t req)
|
|
:
|
|
quota(quota), limit(limit), xfer(xfer), used(used),
|
|
avail(avail), req(req)
|
|
{ }
|
|
};
|
|
|
|
/**
|
|
* Return RAM quota status of the child
|
|
*
|
|
* XXX should be a const method, but the 'Ram_session' accessors
|
|
* are not const
|
|
*/
|
|
Ram_status ram_status()
|
|
{
|
|
return Ram_status(_ram_quota,
|
|
_ram_limit,
|
|
_ram_quota - _resources.ram.quota(),
|
|
_resources.ram.used(),
|
|
_resources.ram.avail(),
|
|
requested_ram_quota());
|
|
}
|
|
|
|
/**
|
|
* Return true if child exited and should be destructed
|
|
*/
|
|
bool exited() const { return _exited; }
|
|
|
|
|
|
/****************************
|
|
** Child_policy interface **
|
|
****************************/
|
|
|
|
const char *name() const { return _label.string(); }
|
|
|
|
Genode::Service *resolve_session_request(const char *service_name,
|
|
const char *args)
|
|
{
|
|
Genode::Service *service = 0;
|
|
|
|
/* check for binary file request */
|
|
if ((service = _binary_policy.resolve_session_request(service_name, args)))
|
|
return service;
|
|
|
|
/* check for config file request */
|
|
if ((service = _config_policy.resolve_session_request(service_name, args)))
|
|
return service;
|
|
|
|
/* fill parent service registry on demand */
|
|
if (!(service = _parent_services.find(service_name))) {
|
|
service = new (Genode::env()->heap())
|
|
Genode::Parent_service(service_name);
|
|
_parent_services.insert(service);
|
|
}
|
|
|
|
/* return parent service */
|
|
return service;
|
|
}
|
|
|
|
void filter_session_args(const char *service,
|
|
char *args, Genode::size_t args_len)
|
|
{
|
|
_labeling_policy.filter_session_args(service, args, args_len);
|
|
}
|
|
|
|
void yield_response()
|
|
{
|
|
if (_withdraw_on_yield_response) {
|
|
enum { RESERVE = 4*1024*1024 };
|
|
|
|
size_t amount = _resources.ram.avail() < RESERVE
|
|
? 0 : _resources.ram.avail() - RESERVE;
|
|
|
|
/* try to immediately withdraw freed-up resources */
|
|
try { withdraw_ram_quota(amount); }
|
|
catch (Ram::Transfer_quota_failed) { }
|
|
}
|
|
|
|
/* propagate yield-response signal */
|
|
Genode::Signal_transmitter(_yield_response_sigh_cap).submit();
|
|
}
|
|
|
|
void resource_request(Genode::Parent::Resource_args const &args)
|
|
{
|
|
_resource_args = args;
|
|
try_response_to_resource_request();
|
|
}
|
|
|
|
void exit(int exit_value) override
|
|
{
|
|
Genode::log("subsystem \"", name(), "\" exited with value ", exit_value);
|
|
_exited = true;
|
|
|
|
/* trigger destruction of the child */
|
|
Genode::Signal_transmitter(_exit_sig_cap).submit();
|
|
}
|
|
};
|
|
|
|
#endif /* _INCLUDE__CLI_MONITOR__CHILD_H_ */
|