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Kernel: Return an already destructed PhysicalPage to the allocators

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By making sure the PhysicalPage instance is fully destructed the
allocators will have a chance to reclaim the PhysicalPageEntry for
free-list purposes. Just pass them the physical address of the page
that was freed, which is enough to lookup the PhysicalPageEntry later.
This commit is contained in:
Tom 2021-07-07 20:28:51 -06:00 • committed by Andreas Kling
parent 87dc4c3d2c
commit c1006a3689
6 changed files with 32 additions and 28 deletions
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18
Kernel/VM/MemoryManager.cpp
View file

@ -728,14 +728,14 @@ void MemoryManager::uncommit_user_physical_pages(size_t page_count)
m_system_memory_info.user_physical_pages_committed -= page_count;
}
void MemoryManager::deallocate_user_physical_page(const PhysicalPage& page)
void MemoryManager::deallocate_user_physical_page(PhysicalAddress paddr)
{
ScopedSpinLock lock(s_mm_lock);
for (auto& region : m_user_physical_regions) {
if (!region.contains(page))
if (!region.contains(paddr))
continue;
region.return_page(page);
region.return_page(paddr);
--m_system_memory_info.user_physical_pages_used;
// Always return pages to the uncommitted pool. Pages that were
@ -745,7 +745,7 @@ void MemoryManager::deallocate_user_physical_page(const PhysicalPage& page)
return;
}
dmesgln("MM: deallocate_user_physical_page couldn't figure out region for user page @ {}", page.paddr());
dmesgln("MM: deallocate_user_physical_page couldn't figure out region for user page @ {}", paddr);
VERIFY_NOT_REACHED();
}
@ -825,21 +825,21 @@ RefPtr<PhysicalPage> MemoryManager::allocate_user_physical_page(ShouldZeroFill s
return page;
}
void MemoryManager::deallocate_supervisor_physical_page(const PhysicalPage& page)
void MemoryManager::deallocate_supervisor_physical_page(PhysicalAddress paddr)
{
ScopedSpinLock lock(s_mm_lock);
for (auto& region : m_super_physical_regions) {
if (!region.contains(page)) {
dbgln("MM: deallocate_supervisor_physical_page: {} not in {} - {}", page.paddr(), region.lower(), region.upper());
if (!region.contains(paddr)) {
dbgln("MM: deallocate_supervisor_physical_page: {} not in {} - {}", paddr, region.lower(), region.upper());
continue;
}
region.return_page(page);
region.return_page(paddr);
--m_system_memory_info.super_physical_pages_used;
return;
}
dbgln("MM: deallocate_supervisor_physical_page couldn't figure out region for super page @ {}", page.paddr());
dbgln("MM: deallocate_supervisor_physical_page couldn't figure out region for super page @ {}", paddr);
VERIFY_NOT_REACHED();
}