This patch set allows to have inlined spinlocks again. V2: rewritten from scratch - now with readable code The rationale behind this is that function calls on at least s390 are expensive. If one considers that server kernels are usually compiled with !CONFIG_PREEMPT a simple spin_lock is just a compare and swap loop. The extra overhead for a function call is significant. With inlined spinlocks overall cpu usage gets reduced by 1%-5% on s390. These numbers were taken with some network benchmarks. However I expect any workload that calls frequently into the kernel and which grabs a few locks to perform better. The implementation is straight forward: move the function bodies of the locking functions to static inline functions and place them in a header file. Dependent on CONFIG_SPINLOCK_INLINE generate out-of-line or inlined locking functions. The patches should be self explaining. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
