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Code Issues Projects Releases Packages Wiki Activity Actions 7

Kernel: Don't release/relock spinlocks repeatedly during space teardown

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Grab the page directory and MM locks once at the start of address space
teardown, then hold onto them across all the region unmapping work.
This commit is contained in:
Andreas Kling 2022-01-12 14:32:21 +01:00
parent 2323cdd914
commit d8206c1059
Notes: sideshowbarker 2024-07-17 21:05:43 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/d8206c10594
3 changed files with 15 additions and 5 deletions
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6
Kernel/Memory/AddressSpace.cpp
View file

@ -321,9 +321,11 @@ void AddressSpace::dump_regions()
void AddressSpace::remove_all_regions(Badge<Process>)
{
VERIFY(Thread::current() == g_finalizer);
SpinlockLocker lock(m_lock);
SpinlockLocker locker(m_lock);
SpinlockLocker pd_locker(m_page_directory->get_lock());
SpinlockLocker mm_locker(s_mm_lock);
for (auto& region : m_regions)
(*region).unmap(Region::ShouldDeallocateVirtualRange::No, ShouldFlushTLB::No);
(*region).unmap_with_locks_held(Region::ShouldDeallocateVirtualRange::No, ShouldFlushTLB::No, pd_locker, mm_locker);
m_regions.clear();
}

13
Kernel/Memory/Region.cpp
View file

@ -234,12 +234,19 @@ bool Region::remap_vmobject_page(size_t page_index, bool with_flush)
return success;
}
void Region::unmap(ShouldDeallocateVirtualRange deallocate_range, ShouldFlushTLB should_flush_tlb)
void Region::unmap(ShouldDeallocateVirtualRange should_deallocate_range, ShouldFlushTLB should_flush_tlb)
{
if (!m_page_directory)
return;
SpinlockLocker pd_locker(m_page_directory->get_lock());
SpinlockLocker mm_locker(s_mm_lock);
unmap_with_locks_held(should_deallocate_range, should_flush_tlb, pd_locker, mm_locker);
}
void Region::unmap_with_locks_held(ShouldDeallocateVirtualRange deallocate_range, ShouldFlushTLB should_flush_tlb, SpinlockLocker<RecursiveSpinlock>&, SpinlockLocker<RecursiveSpinlock>&)
{
if (!m_page_directory)
return;
SpinlockLocker page_lock(m_page_directory->get_lock());
SpinlockLocker lock(s_mm_lock);
size_t count = page_count();
for (size_t i = 0; i < count; ++i) {
auto vaddr = vaddr_from_page_index(i);

1
Kernel/Memory/Region.h
View file

@ -179,6 +179,7 @@ public:
Yes,
};
void unmap(ShouldDeallocateVirtualRange, ShouldFlushTLB = ShouldFlushTLB::Yes);
void unmap_with_locks_held(ShouldDeallocateVirtualRange, ShouldFlushTLB, SpinlockLocker<RecursiveSpinlock>& pd_locker, SpinlockLocker<RecursiveSpinlock>& mm_locker);
void remap();