LadybirdBrowser/ladybird
1
1
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-01-08 04:15:23 +03:00
Code Issues Packages Projects Releases Wiki Activity

Kernel: Fix the search method of free userspace physical pages (#742)

Browse Source 
Now the userspace page allocator will search through physical regions,
and stop the search as it finds an available page.

Also remove an "address of" sign since we don't need that when
counting size of physical regions
This commit is contained in:
Liav A 2019-11-08 23:39:29 +02:00 committed by Andreas Kling
parent fa77a57257
commit bce510bf6f
Notes: sideshowbarker 2024-07-19 11:19:28 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/bce510bf6ff
Pull-request: https://github.com/SerenityOS/serenity/pull/742
2 changed files with 14 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
Kernel/VM/MemoryManager.cpp
View File

@ -144,7 +144,7 @@ void MemoryManager::initialize_paging()
} else {
if (region.is_null() || region_is_super || region->upper().offset(PAGE_SIZE) != addr) {
m_user_physical_regions.append(PhysicalRegion::create(addr, addr));
region = &m_user_physical_regions.last();
region = m_user_physical_regions.last();
region_is_super = false;
} else {
region->expand(region->lower(), addr);
@ -386,16 +386,21 @@ void MemoryManager::deallocate_user_physical_page(PhysicalPage&& page)
ASSERT_NOT_REACHED();
}
RefPtr<PhysicalPage> MemoryManager::find_free_user_physical_page()
{
RefPtr<PhysicalPage> page;
for (auto& region : m_user_physical_regions) {
page = region.take_free_page(false);
if (!page.is_null())
break;
}
return page;
}
RefPtr<PhysicalPage> MemoryManager::allocate_user_physical_page(ShouldZeroFill should_zero_fill)
{
InterruptDisabler disabler;
RefPtr<PhysicalPage> page;
for (auto& region : m_user_physical_regions) {
page = region.take_free_page(false);
if (page.is_null())
continue;
}
RefPtr<PhysicalPage> page = find_free_user_physical_page();
if (!page) {
if (m_user_physical_regions.is_empty()) {

1
Kernel/VM/MemoryManager.h
View File

@ -103,6 +103,7 @@ private:
static Region* region_from_vaddr(VirtualAddress);
RefPtr<PhysicalPage> find_free_user_physical_page();
u8* quickmap_page(PhysicalPage&);
void unquickmap_page();