On Tue, 29 Mar 2011 08:54:14 +0800 Shaohua Li <shaohua.li@xxxxxxxxx> wrote: > -struct percpu_counter vm_committed_as; > +struct percpu_counter vm_committed_as ____cacheline_internodealigned_in_smp; Why ____cacheline_internodealigned_in_smp? That's pretty aggressive. afacit the main benefit from this will occur if the read-only vm_committed_as.counters lands in the same cacheline as some write-frequently storage. But that's a complete mad guess and I'd prefer not to have to guess. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>