Steven Rostedt writes: > The data in .data.percpu_offset holds is referenced by the per_cpu > variable name which points to the __per_cpu_offset array. For modules, > it will point to the per_cpu_offset array of the module. > > Example: > > DEFINE_PER_CPU(int, myint); > > would now create a variable called per_cpu_offset__myint in > the .data.percpu_offset section. This variable will point to the (if > defined in the kernel) __per_cpu_offset[] array. If this was a module > variable, it would point to the module per_cpu_offset[] array which is > created when the modules is loaded. This sounds like you have an extra memory reference each time a per-cpu variable is accessed. Have you tried to measure the performance impact of that? If so, how much performance does it lose? Paul.
