Andi Kleen wrote on Thursday, December 07, 2006 6:28 PM > "Chen, Kenneth W" <[EMAIL PROTECTED]> writes: > > I tried to use cache_line_size() to find out the alignment of struct bio, > > but > > stumbled on that it is a runtime function for x86_64. > > It's a single global variable access: > > #define cache_line_size() (boot_cpu_data.x86_cache_alignment) > > Or do you mean it caused cache misses? boot_cpu_data is cache aligned > and practically read only, so there shouldn't be any false sharing at least.
No, I was looking for a generic constant that describes cache line size. I needed a constant in order to avoid runtime check and to rely on compiler to optimize a conditional check away. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
