Commits on Sep 16, 2024

1. Optimize klp_shadow performance with improved locking and RCU usage …

   This commit enhances the performance of the klp_shadow module by applying several optimizations:
   
   - **Minimized spinlock contention**: Critical sections using spinlocks are reduced to only necessary regions, while memory allocation and initialization are performed outside the lock. This reduces contention and improves parallelism.
     
   - **Branch prediction hints**: Added `likely()` and `unlikely()` macros for frequently occurring conditions, improving CPU branch prediction and overall performance.
     
   - **RCU-safe lookups**: Replaced `hash_for_each_possible()` with `hash_for_each_possible_rcu()` where appropriate, allowing for more efficient read-side lookups without blocking writes.
     
   - **Optimized memory freeing**: Improved shadow variable freeing by batching operations under the lock and using `hash_for_each_rcu()` in `klp_shadow_free_all()` for faster traversal.
   
   These changes improve concurrency and efficiency in managing shadow variables, especially under high-load scenarios, while maintaining safety through proper RCU mechanisms.

   

   HajimohammadiNet authored Sep 16, 2024
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