n Tue, 20 Nov 2007, Andi Kleen wrote: > > > Although we have a per-cpu area base in a fixed global register > > for addressing, the above isn't beneficial on sparc64 because > > the atomic is much slower than doing a: > > > > local_irq_disable(); > > nonatomic_percpu_memory_op(); > > local_irq_enable(); > > Again might be pointing out the obvious, but you > need of course save_flags()/restore_flags(), not disable/enable(). > > If it was just disable/enable x86 could do it much faster too > and Christoph probably would never felt the need to approach > this project for his SLUB fast path.
I already have no need for that anymore with the material now in Andrews tree. However, this cuts out another 6 cycles from the fastpath and I found that the same principles reduce overhead all over the kernel. - 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/
