Kernel: Do less unnecessary work when tearing down process address space

When deleting an entire AddressSpace, we don't need to do TLB flushes
at all (since the entire page directory is going away anyway).

We also don't need to deallocate VM ranges one by one, since the entire
VM range allocator will be deleted anyway.

1 files changed, 3 insertions, 0 deletions

diff --git a/Kernel/Memory/AddressSpace.cpp b/Kernel/Memory/AddressSpace.cpp
index d275561b4e..dbda1324e1 100644
--- a/Kernel/Memory/AddressSpace.cpp
+++ b/Kernel/Memory/AddressSpace.cpp
@@ -320,7 +320,10 @@ void AddressSpace::dump_regions()
 
 void AddressSpace::remove_all_regions(Badge<Process>)
 {
+    VERIFY(Thread::current() == g_finalizer);
     SpinlockLocker lock(m_lock);
+    for (auto& region : m_regions)
+        (*region).unmap(Region::ShouldDeallocateVirtualRange::No, ShouldFlushTLB::No);
     m_regions.clear();
 }