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Kernel: Dump OOM debug info after releasing the MM global data lock

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Otherwise we would be holding the MM global data lock and the Process
address space locks in reversed order to the rest of the system, which
can lead to deadlocks.
This commit is contained in:
Idan Horowitz 2022-08-27 19:00:57 +03:00
parent 4ce326205e
commit 12300b7d0b
1 changed files with 21 additions and 20 deletions
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17
Kernel/Memory/MemoryManager.cpp
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@ -829,10 +829,17 @@ ErrorOr<NonnullOwnPtr<Region>> MemoryManager::allocate_kernel_region_with_vmobje
ErrorOr<CommittedPhysicalPageSet> MemoryManager::commit_physical_pages(size_t page_count)
{
VERIFY(page_count > 0);
return m_global_data.with([&](auto& global_data) -> ErrorOr<CommittedPhysicalPageSet> {
auto result = m_global_data.with([&](auto& global_data) -> ErrorOr<CommittedPhysicalPageSet> {
if (global_data.system_memory_info.physical_pages_uncommitted < page_count) {
dbgln("MM: Unable to commit {} pages, have only {}", page_count, global_data.system_memory_info.physical_pages_uncommitted);
return ENOMEM;
}
global_data.system_memory_info.physical_pages_uncommitted -= page_count;
global_data.system_memory_info.physical_pages_committed += page_count;
return CommittedPhysicalPageSet { {}, page_count };
});
if (result.is_error()) {
Process::for_each([&](Process const& process) {
size_t amount_resident = 0;
size_t amount_shared = 0;
@ -850,14 +857,8 @@ ErrorOr<CommittedPhysicalPageSet> MemoryManager::commit_physical_pages(size_t pa
amount_virtual / PAGE_SIZE);
return IterationDecision::Continue;
});
return ENOMEM;
}
global_data.system_memory_info.physical_pages_uncommitted -= page_count;
global_data.system_memory_info.physical_pages_committed += page_count;
return CommittedPhysicalPageSet { {}, page_count };
});
return result;
}
void MemoryManager::uncommit_physical_pages(Badge<CommittedPhysicalPageSet>, size_t page_count)