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Kernel/Locking: Add lock rank tracking per thread to find deadlocks

This change adds a static lock hierarchy / ranking to the Kernel with
the goal of reducing / finding deadlocks when running with SMP enabled.

We have seen quite a few lock ordering deadlocks (locks taken in a
different order, on two different code paths). As we properly annotate
locks in the system, then these facilities will find these locking
protocol violations automatically

The `LockRank` enum documents the various locks in the system and their
rank. The implementation guarantees that a thread holding one or more
locks of a lower rank cannot acquire an additional lock with rank that
is greater or equal to any of the currently held locks.
This commit is contained in:
Brian Gianforcaro 2021-09-07 02:40:31 -07:00 committed by Andreas Kling
parent 0718afa773
commit 066b0590ec
5 changed files with 128 additions and 0 deletions

View file

@ -161,6 +161,7 @@ set(KERNEL_SOURCES
Memory/VirtualRange.cpp
Memory/VirtualRangeAllocator.cpp
MiniStdLib.cpp
Locking/LockRank.cpp
Locking/Mutex.cpp
Net/E1000ENetworkAdapter.cpp
Net/E1000NetworkAdapter.cpp