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Distinction between total memory and buddy memory

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This commit is contained in:
Baptiste Wicht 2018-03-28 14:20:00 +02:00
parent 84c2fedf9f
commit 4e52e284a0
2 changed files with 80 additions and 20 deletions
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17
kernel/include/physical_allocator.hpp
View File

@ -54,17 +54,32 @@ void free(size_t address, size_t pages);
/*!
* \brief Return the amount of physical memory available
*/
size_t total_available();
/*!
* \brief Return the amount of physical memory currently available
*/
size_t available();
/*!
* \brief Return the amount of physical memory allocated
*/
size_t total_allocated();
/*!
* \brief Return the amount of physical memory currently allocated
*/
size_t allocated();
/*!
* \brief Return the amount of physical memory currently free
*/
size_t free();
/*!
* \brief Return the amount of physical memory free
*/
size_t free();
size_t total_free();
} //end of physical_allocator namespace

81
kernel/src/physical_allocator.cpp
View File

@ -34,17 +34,21 @@ buddy_type allocator;
size_t first_physical_address;
size_t last_physical_address;
bool buddy = false;
size_t buddy_managed_space = 0;
size_t buddy_allocated_memory = 0;
size_t array_size(size_t managed_space, size_t block){
return (managed_space / (block * unit) + 1) / (sizeof(uint64_t) * 8) + 1;
}
uint64_t* create_array(size_t managed_space, size_t block){
uint64_t* create_buddy_array(size_t managed_space, size_t block){
auto size = array_size(managed_space, block) * sizeof(uint64_t);
auto pages = paging::pages(size);
auto physical_address = current_mmap_entry_position;
allocated_memory += pages * paging::PAGE_SIZE;
buddy_allocated_memory += pages * paging::PAGE_SIZE;
current_mmap_entry_position += pages * paging::PAGE_SIZE;
auto virtual_address = virtual_allocator::allocate(pages);
@ -60,14 +64,26 @@ std::string sysfs_free(){
return std::to_string(physical_allocator::free());
}
std::string sysfs_total_free(){
return std::to_string(physical_allocator::total_free());
}
std::string sysfs_available(){
return std::to_string(physical_allocator::available());
}
std::string sysfs_total_available(){
return std::to_string(physical_allocator::total_available());
}
std::string sysfs_allocated(){
return std::to_string(physical_allocator::allocated());
}
std::string sysfs_total_allocated(){
return std::to_string(physical_allocator::total_allocated());
}
} //End of anonymous namespace
void physical_allocator::early_init(){
@ -123,24 +139,23 @@ size_t physical_allocator::early_allocate(size_t blocks){
void physical_allocator::init(){
//Make sure to start with an aligned address
if((current_mmap_entry_position % paging::PAGE_SIZE) != 0){
allocated_memory += current_mmap_entry_position % paging::PAGE_SIZE;
buddy_allocated_memory += current_mmap_entry_position % paging::PAGE_SIZE;
current_mmap_entry_position = current_mmap_entry_position + current_mmap_entry_position % paging::PAGE_SIZE;
}
// Compute the size of the managed space
// Compute the size of the managed space available into the
// current mmap entry
auto size = current_mmap_entry->size;
auto managed_space = size - (current_mmap_entry_position - current_mmap_entry->base);
logging::logf(logging::log_level::TRACE, "palloc: Managed space %m\n", size_t(managed_space));
auto data_bitmap_1 = create_array(managed_space, 1);
auto data_bitmap_2 = create_array(managed_space, 2);
auto data_bitmap_4 = create_array(managed_space, 4);
auto data_bitmap_8 = create_array(managed_space, 8);
auto data_bitmap_16 = create_array(managed_space, 16);
auto data_bitmap_32 = create_array(managed_space, 32);
auto data_bitmap_64 = create_array(managed_space, 64);
auto data_bitmap_128 = create_array(managed_space, 128);
auto data_bitmap_1 = create_buddy_array(managed_space, 1);
auto data_bitmap_2 = create_buddy_array(managed_space, 2);
auto data_bitmap_4 = create_buddy_array(managed_space, 4);
auto data_bitmap_8 = create_buddy_array(managed_space, 8);
auto data_bitmap_16 = create_buddy_array(managed_space, 16);
auto data_bitmap_32 = create_buddy_array(managed_space, 32);
auto data_bitmap_64 = create_buddy_array(managed_space, 64);
auto data_bitmap_128 = create_buddy_array(managed_space, 128);
first_physical_address = current_mmap_entry_position;
last_physical_address = current_mmap_entry->base + current_mmap_entry->size;
@ -158,6 +173,13 @@ void physical_allocator::init(){
allocator.init();
// The available space is now dependent only on the buddy allocator
buddy = true;
buddy_managed_space = managed_space;
logging::logf(logging::log_level::TRACE, "palloc: Buddy allocator in place\n");
logging::logf(logging::log_level::TRACE, "palloc: Managed space %m\n", size_t(managed_space));
//TODO The current system uses more memory than necessary,
//because it also tries to index memory that is used for the
//buddy system.
@ -167,8 +189,11 @@ void physical_allocator::init(){
void physical_allocator::finalize(){
sysfs::set_dynamic_value(path("/sys"), path("/memory/physical/available"), &sysfs_available);
sysfs::set_dynamic_value(path("/sys"), path("/memory/physical/free"), &sysfs_free);
sysfs::set_dynamic_value(path("/sys"), path("/memory/physical/total_available"), &sysfs_total_available);
sysfs::set_dynamic_value(path("/sys"), path("/memory/physical/allocated"), &sysfs_allocated);
sysfs::set_dynamic_value(path("/sys"), path("/memory/physical/total_allocated"), &sysfs_total_allocated);
sysfs::set_dynamic_value(path("/sys"), path("/memory/physical/free"), &sysfs_free);
sysfs::set_dynamic_value(path("/sys"), path("/memory/physical/total_free"), &sysfs_total_free);
// Publish the e820 map
auto entries = e820::mmap_entry_count();
@ -188,7 +213,7 @@ void physical_allocator::finalize(){
size_t physical_allocator::allocate(size_t blocks){
thor_assert(blocks * paging::PAGE_SIZE < free(), "Not enough physical memory");
allocated_memory += buddy_type::level_size(blocks) * unit;
buddy_allocated_memory += buddy_type::level_size(blocks) * unit;
auto phys = allocator.allocate(blocks);
@ -200,17 +225,37 @@ size_t physical_allocator::allocate(size_t blocks){
}
void physical_allocator::free(size_t address, size_t blocks){
allocated_memory -= buddy_type::level_size(blocks) * unit;
buddy_allocated_memory -= buddy_type::level_size(blocks) * unit;
return allocator.free(address, blocks);
}
size_t physical_allocator::available(){
size_t physical_allocator::total_available(){
return e820::available_memory();
}
size_t physical_allocator::available(){
if(buddy){
return buddy_managed_space;
} else {
return total_available();
}
}
size_t physical_allocator::total_allocated(){
return buddy_allocated_memory + allocated_memory;
}
size_t physical_allocator::allocated(){
if(buddy){
return allocated_memory;
} else {
return buddy_allocated_memory;
}
}
size_t physical_allocator::total_free(){
return total_available() - total_allocated();
}
size_t physical_allocator::free(){