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hw: replace double_list implementation

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Replace double linked list by normal Genode::List with an additional
pointer to last list member to efficiently handle the scheduler share lists.
Moreover, move it into the private part of the Cpu_scheduler class,
the only scope where it is used anymore.

Ref genodelabs/genode#5115
This commit is contained in:
Stefan Kalkowski 2024-02-05 15:53:08 +01:00 committed by Christian Helmuth
parent 0055438257
commit 8e2c95e5e4
7 changed files with 103 additions and 526 deletions
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56
repos/base-hw/run/double_list.run
View File

@ -1,56 +0,0 @@
build { core init lib/ld test/double_list }
create_boot_directory
install_config {
<config>
<parent-provides>
<service name="LOG"/>
<service name="RM"/>
<service name="PD"/>
<service name="CPU"/>
<service name="ROM"/>
</parent-provides>
<default-route>
<any-service> <parent/> </any-service>
</default-route>
<start name="test-double_list" caps="100">
<resource name="RAM" quantum="10M"/>
</start>
</config>
}
build_boot_image [build_artifacts]
append qemu_args " -nographic"
run_genode_until "done.*\n" 10
grep_output {\[init -> test-double_list\]}
compare_output_to {
[init -> test-double_list] print each
[init -> test-double_list] print each
[init -> test-double_list] 1
[init -> test-double_list] print each
[init -> test-double_list] 3
[init -> test-double_list] 2
[init -> test-double_list] 5
[init -> test-double_list] 7
[init -> test-double_list] 6
[init -> test-double_list] 4
[init -> test-double_list] 1
[init -> test-double_list] print each
[init -> test-double_list] 8
[init -> test-double_list] 9
[init -> test-double_list] 2
[init -> test-double_list] 5
[init -> test-double_list] 1
[init -> test-double_list] 7
[init -> test-double_list] 6
[init -> test-double_list] 4
[init -> test-double_list] 3
[init -> test-double_list] print each
[init -> test-double_list] 7
[init -> test-double_list] 8
[init -> test-double_list] done
}

19
repos/base-hw/src/core/kernel/cpu_scheduler.cc
View File

@ -82,7 +82,7 @@ void Cpu_scheduler::_head_claimed(unsigned const r)
void Cpu_scheduler::_head_filled(unsigned const r)
{
if (_fills.head() != &_head->_fill_item)
if (_fills.head() != _head)
return;
if (r)
@ -98,17 +98,15 @@ bool Cpu_scheduler::_claim_for_head()
{
bool result { false };
_for_each_prio([&] (Cpu_priority const p, bool &cancel_for_each_prio) {
Double_list_item<Cpu_share> *const item { _rcl[p].head() };
Cpu_share* const share = _rcl[p].head();
if (!item)
if (!share)
return;
Cpu_share &share { item->payload() };
if (!share._claim)
if (!share->_claim)
return;
_set_head(share, share._claim, 1);
_set_head(*share, share->_claim, 1);
result = true;
cancel_for_each_prio = true;
});
@ -118,12 +116,11 @@ bool Cpu_scheduler::_claim_for_head()
bool Cpu_scheduler::_fill_for_head()
{
Double_list_item<Cpu_share> *const item { _fills.head() };
if (!item)
Cpu_share *const share = _fills.head();
if (!share)
return false;
Share &share = item->payload();
_set_head(share, share._fill, 0);
_set_head(*share, share->_fill, 0);
return true;
}

112
repos/base-hw/src/core/kernel/cpu_scheduler.h
View File

@ -1,6 +1,7 @@
/*
* \brief Schedules CPU shares for the execution time of a CPU
* \author Martin Stein
* \author Stefan Kalkowski
* \date 2014-10-09
*/
@ -16,9 +17,9 @@
/* core includes */
#include <util.h>
#include <util/list.h>
#include <util/misc_math.h>
#include <kernel/configuration.h>
#include <kernel/double_list.h>
namespace Kernel {
@ -90,13 +91,15 @@ class Kernel::Cpu_share
private:
Double_list_item<Cpu_share> _fill_item { *this };
Double_list_item<Cpu_share> _claim_item { *this };
Cpu_priority const _prio;
unsigned _quota;
unsigned _claim;
unsigned _fill { 0 };
bool _ready { false };
using List_element = Genode::List_element<Cpu_share>;
List_element _fill_item { this };
List_element _claim_item { this };
Cpu_priority const _prio;
unsigned _quota;
unsigned _claim;
unsigned _fill { 0 };
bool _ready { false };
public:
@ -123,22 +126,89 @@ class Kernel::Cpu_scheduler
private:
class Share_list
{
private:
using List_element = Genode::List_element<Cpu_share>;
Genode::List<List_element> _list {};
List_element *_last { nullptr };
public:
template <typename F> void for_each(F const &fn)
{
for (List_element * le = _list.first(); le; le = le->next())
fn(*le->object());
}
template <typename F> void for_each(F const &fn) const
{
for (List_element const * le = _list.first(); le;
le = le->next()) fn(*le->object());
}
Cpu_share* head() const {
return _list.first() ? _list.first()->object() : nullptr; }
void insert_head(List_element * const le)
{
_list.insert(le);
if (!_last) _last = le;
}
void insert_tail(List_element * const le)
{
_list.insert(le, _last);
_last = le;
}
void remove(List_element * const le)
{
_list.remove(le);
if (_last != le)
return;
_last = nullptr;
for (List_element * le = _list.first(); le; le = le->next())
_last = le;
}
void to_tail(List_element * const le)
{
remove(le);
insert_tail(le);
}
void to_head(List_element * const le)
{
remove(le);
insert_head(le);
}
void head_to_tail() {
to_tail(_list.first()); }
};
typedef Cpu_share Share;
typedef Cpu_priority Prio;
Double_list<Cpu_share> _rcl[Prio::max() + 1]; /* ready claims */
Double_list<Cpu_share> _ucl[Prio::max() + 1]; /* unready claims */
Double_list<Cpu_share> _fills { }; /* ready fills */
Share &_idle;
Share *_head = nullptr;
unsigned _head_quota = 0;
bool _head_claims = false;
bool _head_yields = false;
unsigned const _quota;
unsigned _residual;
unsigned const _fill;
bool _need_to_schedule { true };
time_t _last_time { 0 };
Share_list _rcl[Prio::max() + 1]; /* ready claims */
Share_list _ucl[Prio::max() + 1]; /* unready claims */
Share_list _fills { }; /* ready fills */
Share &_idle;
Share *_head = nullptr;
unsigned _head_quota = 0;
bool _head_claims = false;
bool _head_yields = false;
unsigned const _quota;
unsigned _residual;
unsigned const _fill;
bool _need_to_schedule { true };
time_t _last_time { 0 };
template <typename F> void _for_each_prio(F f)
{

192
repos/base-hw/src/core/kernel/double_list.h
View File

@ -1,192 +0,0 @@
/*
* \brief List of double connected items
* \author Martin Stein
* \date 2012-11-30
*/
/*
* Copyright (C) 2012-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _CORE__KERNEL__DOUBLE_LIST_H_
#define _CORE__KERNEL__DOUBLE_LIST_H_
namespace Kernel {
/**
* Ability to be an item in a double connected list
*/
template <typename T>
class Double_list_item;
/**
* List of double connected items
*/
template <typename T>
class Double_list;
}
template <typename T>
class Kernel::Double_list_item
{
friend class Double_list<T>;
private:
Double_list_item * _next = nullptr;
Double_list_item * _prev = nullptr;
T & _payload;
public:
Double_list_item(T &payload) : _payload(payload) { }
T &payload() { return _payload; }
};
template <typename T>
class Kernel::Double_list
{
private:
typedef Double_list_item<T> Item;
Item * _head;
Item * _tail;
void _connect_neighbors(Item * const i)
{
i->_prev->_next = i->_next;
i->_next->_prev = i->_prev;
}
void _to_tail(Item * const i)
{
if (i == _tail) { return; }
_connect_neighbors(i);
i->_prev = _tail;
i->_next = 0;
_tail->_next = i;
_tail = i;
}
void _to_head(Item * const i)
{
if (i == _head)
return;
_connect_neighbors(i);
i->_next = _head;
i->_prev = 0;
_head->_prev = i;
_head = i;
}
void _tail_to_head()
{
if (_tail == 0 || _tail == _head)
return;
_tail->_next = _head;
_head->_prev = _tail;
_tail = _tail->_prev;
_tail->_next = 0;
_head = _head->_prev;
_head->_prev = 0;
}
public:
/**
* Construct empty list
*/
Double_list() : _head(0), _tail(0) { }
/**
* Move item 'i' from its current list position to the tail
*/
void to_tail(Item * const i)
{
if (i == _head) { head_to_tail(); }
else { _to_tail(i); }
}
void to_head(Item * const i)
{
if (i == _tail)
_tail_to_head();
else
_to_head(i);
}
/**
* Insert item 'i' as new tail into list
*/
void insert_tail(Item * const i)
{
if (_tail) { _tail->_next = i; }
else { _head = i; }
i->_prev = _tail;
i->_next = 0;
_tail = i;
}
/**
* Insert item 'i' as new head into list
*/
void insert_head(Item * const i)
{
if (_head) { _head->_prev = i; }
else { _tail = i; }
i->_next = _head;
i->_prev = 0;
_head = i;
}
/**
* Remove item 'i' from list
*/
void remove(Item * const i)
{
if (i == _tail) { _tail = i->_prev; }
else { i->_next->_prev = i->_prev; }
if (i == _head) { _head = i->_next; }
else { i->_prev->_next = i->_next; }
}
/**
* Move head item of list to tail position
*/
void head_to_tail()
{
if (!_head || _head == _tail)
return;
_head->_prev = _tail;
_tail->_next = _head;
_head = _head->_next;
_head->_prev = 0;
_tail = _tail->_next;
_tail->_next = 0;
}
/**
* Call function 'f' of type 'void (Item *)' for each item in the list
*/
template <typename F> void for_each(F f) {
for (Item * i = _head; i; i = i->_next) { f(i->payload()); } }
/*
* Accessors
*/
Item * head() const { return _head; }
static Item * next(Item * const i) { return i->_next; }
};
#endif /* _CORE__KERNEL__DOUBLE_LIST_H_ */

16
repos/base-hw/src/test/cpu_scheduler/main.cc
View File

@ -27,11 +27,10 @@ namespace Cpu_scheduler_test {
class Cpu_scheduler;
class Main;
using Share_list = List<List_element<Cpu_share>>;
static Cpu_share &cast(Kernel::Cpu_share &share);
static Cpu_share const &cast(Kernel::Cpu_share const &share);
static Double_list<Kernel::Cpu_share> &cast(Double_list<Kernel::Cpu_share> const &list);
}
@ -255,13 +254,6 @@ Cpu_scheduler_test::cast(Kernel::Cpu_share const &share)
}
static Double_list<Kernel::Cpu_share> &
Cpu_scheduler_test::cast(Double_list<Kernel::Cpu_share> const &list)
{
return *const_cast<Double_list<Kernel::Cpu_share> *>(&list);
}
/***************************************
** Cpu_scheduler_test::Cpu_scheduler **
***************************************/
@ -308,7 +300,7 @@ void Cpu_scheduler_test::Cpu_scheduler::print(Output &output) const
print(output, " ready: ");
bool first_share { true };
cast(_rcl[prio]).for_each([&] (Kernel::Cpu_share const &share) {
_rcl[prio].for_each([&] (Kernel::Cpu_share const &share) {
if (&share == _head && _head_claims) {
if (_need_to_schedule) {
@ -331,7 +323,7 @@ void Cpu_scheduler_test::Cpu_scheduler::print(Output &output) const
print(output, " unready: ");
bool first_share { true };
cast(_ucl[prio]).for_each([&] (Kernel::Cpu_share const &share) {
_ucl[prio].for_each([&] (Kernel::Cpu_share const &share) {
print(
output, first_share ? "" : ", ", cast(share).label() , "-",
@ -348,7 +340,7 @@ void Cpu_scheduler_test::Cpu_scheduler::print(Output &output) const
print(output, "\n fills: ");
bool first_share { true };
cast(_fills).for_each([&] (Kernel::Cpu_share const &share) {
_fills.for_each([&] (Kernel::Cpu_share const &share) {
if (&share == _head && !_head_claims) {
if (_need_to_schedule) {

12
repos/base-hw/src/test/double_list/target.mk
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@ -1,12 +0,0 @@
#
# \brief Build config for a core that tests its double-list implementation
# \author Martin Stein
# \date 2011-12-16
#
TARGET = test-double_list
INC_DIR = $(REP_DIR)/src/core
SRC_CC = test.cc
LIBS = base
vpath double_list.cc $(REP_DIR)/src/core/kernel

222
repos/base-hw/src/test/double_list/test.cc
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@ -1,222 +0,0 @@
/*
* \brief Test double-list implementation of the kernel
* \author Martin Stein
* \date 2014-09-30
*/
/*
* Copyright (C) 2014-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
/* base includes */
#include <util/construct_at.h>
#include <base/component.h>
#include <base/log.h>
/* core includes */
#include <kernel/double_list.h>
/*
* Utilities
*/
using Genode::size_t;
using Kernel::Double_list;
using Kernel::Double_list_item;
struct Item_load { char volatile x = 0, y = 0, z = 0; };
struct Item : Item_load, Double_list_item<Item>
{
unsigned _id;
Item(unsigned const id) : Double_list_item<Item>(*this), _id(id) { x = 1; y = 2; z = 3; }
void iteration() { Genode::log(_id); }
};
struct Data
{
static constexpr unsigned nr_of_items = 9;
Double_list<Item> list { };
char items[nr_of_items][sizeof(Item)];
Data()
{
for (unsigned i = 0; i < nr_of_items; i++) {
Genode::construct_at<Item>(&items[i], i + 1); }
}
};
Data * data()
{
static Data d;
return &d;
}
void done()
{
Genode::log("done");
while (1) ;
}
void check(unsigned i1, unsigned l)
{
Double_list_item<Item> * const li2 = data()->list.head();
if (li2) {
Item * const i2 = &li2->payload();
if (i1) {
if(i1 == i2->_id) { return; }
Genode::log("head ", i2->_id, " in line ", l);
done();
} else {
Genode::log("non-empty ", i2->_id, " in line ", l);
done();
}
} else if (i1) {
Genode::log("empty in line ", l);
done();
}
}
void print_each()
{
Genode::log("print each");
data()->list.for_each([] (Item &i) { i.iteration(); });
}
Item * item(unsigned const i) {
return reinterpret_cast<Item *>(&data()->items[i - 1]); }
/*
* Shortcuts for all basic operations that the test consists of
*/
#define C(i) check(i, __LINE__);
#define T(i) data()->list.insert_tail(item(i));
#define H(i) data()->list.insert_head(item(i));
#define R(i) data()->list.remove(item(i));
#define B(i) data()->list.to_tail(item(i));
#define P print_each();
#define N data()->list.head_to_tail();
/**
* Main routine
*/
void Component::construct(Genode::Env &)
{
/*
* Step-by-step testing
*
* Every line in this test is structured according to the scheme
* '<ops> C(i) <doc>' where the symbols are defined as follows:
*
* ops Operations that affect the list structure. These are:
*
* T(i) insert the item with ID 'i' as tail
* H(i) insert the item with ID 'i' as head
* R(i) remove the item with ID 'i'
* B(i) move the item with ID 'i' to the tail
* N move the head to the tail
* P print IDs of the items in the list in their list order
*
* C(i) check if the item with ID 'i' is head
*
* doc Documents the expected list content for the point after the
* operations in the corresponding line.
*
* If any check in a line fails, the test prematurely stops and prints out
* where and why it has stopped.
*/
C(0) /* */
N C(0) /* */
P C(0) /* */
T(1) C(1) /* 1 */
N C(1) /* 1 */
P N C(1) /* 1 */
B(1) C(1) /* 1 */
N C(1) /* 1 */
R(1) C(0) /* */
N C(0) /* */
N C(0) /* */
H(2) C(2) /* 2 */
N C(2) /* 2 */
N C(2) /* 2 */
T(3) C(2) /* 2 3 */
N C(3) /* 3 2 */
B(2) C(3) /* 3 2 */
N C(2) /* 2 3 */
H(4) C(4) /* 4 2 3 */
N C(2) /* 2 3 4 */
N C(3) /* 3 4 2 */
N C(4) /* 4 2 3 */
R(4) N C(3) /* 3 2 */
N C(2) /* 2 3 */
T(1) C(2) /* 2 3 1 */
N C(3) /* 3 1 2 */
N C(1) /* 1 2 3 */
N C(2) /* 2 3 1 */
N C(3) /* 3 1 2 */
R(1) C(3) /* 3 2 */
N C(2) /* 2 3 */
N C(3) /* 3 2 */
B(3) C(2) /* 2 3 */
T(4) T(1) C(2) /* 2 3 4 1 */
N N C(4) /* 4 1 2 3 */
N C(1) /* 1 2 3 4 */
N N C(3) /* 3 4 1 2 */
R(2) C(3) /* 3 4 1 */
R(3) C(4) /* 4 1 */
N C(1) /* 1 4 */
N N C(1) /* 1 4 */
T(3) T(2) C(1) /* 1 4 3 2 */
T(5) N C(4) /* 4 3 2 5 1 */
T(7) H(6) C(6) /* 6 4 3 2 5 1 7 */
N C(4) /* 4 3 2 5 1 7 6 */
B(4) C(3) /* 3 2 5 1 7 6 4 */
B(4) N N C(5) /* 5 1 7 6 4 3 2 */
N B(7) N C(6) /* 6 4 3 2 5 7 1*/
N N B(1) C(3) /* 3 2 5 7 6 4 1 */
P C(3) /* 3 2 5 7 6 4 1 */
R(4) H(4) C(4) /* 4 3 2 5 7 6 1 */
B(7) B(6) C(4) /* 4 3 2 5 1 7 6 */
N N N C(5) /* 5 1 7 6 4 3 2 */
N N N C(6) /* 6 4 3 2 5 1 7 */
N N N C(2) /* 2 5 1 7 6 4 3 */
T(9) N N C(1) /* 1 7 6 4 3 9 2 5 */
N N N N C(3) /* 3 9 2 5 1 7 6 4 */
N N N N C(1) /* 1 7 6 4 3 9 2 5 */
N N N C(4) /* 4 3 9 2 5 1 7 6 */
N N C(9) /* 9 2 5 1 7 6 4 3 */
H(8) P C(8) /* 8 9 2 5 1 7 6 4 3 */
R(8) C(9) /* 9 2 5 1 7 6 4 3 */
R(9) C(2) /* 2 5 1 7 6 4 3 */
R(1) N N C(7) /* 7 6 4 3 2 5 */
N R(6) N C(3) /* 3 2 5 7 4 */
T(8) R(3) C(2) /* 2 5 7 4 8 */
N N R(5) C(7) /* 7 4 8 2 */
R(2) R(4) C(7) /* 7 8 */
N C(8) /* 8 7 */
N P C(7) /* 7 8 */
R(7) C(8) /* 7 8 */
R(8) C(0) /* */
C(0) /* */
done();
}