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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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19
Kernel/VM/PhysicalPage.cpp
View file

@ -27,14 +27,21 @@ PhysicalAddress PhysicalPage::paddr() const
return MM.get_physical_address(*this);
}
void PhysicalPage::return_to_freelist() const
void PhysicalPage::free_this()
{
VERIFY((paddr().get() & ~PAGE_MASK) == 0);
if (m_may_return_to_freelist) {
auto paddr = MM.get_physical_address(*this);
bool is_supervisor = m_supervisor;
if (m_supervisor)
MM.deallocate_supervisor_physical_page(*this);
else
MM.deallocate_user_physical_page(*this);
this->~PhysicalPage(); // delete in place
if (is_supervisor)
MM.deallocate_supervisor_physical_page(paddr);
else
MM.deallocate_user_physical_page(paddr);
} else {
this->~PhysicalPage(); // delete in place
}
}
}