On Fri, Aug 02, 2013 at 11:37:23AM -0400, Johannes Weiner wrote: > Changes in version 2: v2 looks great to me. zone->alloc_batch -= 1U << order; 3147: d3 e0 shl %cl,%eax 3149: 29 42 54 sub %eax,0x54(%rdx) gcc builds it as one asm insn too. Considering we depend on gcc to be optimal and to update ptes in a single insn (and if it doesn't we'll corrupt memory), keeping it in C should always provide the update in a single insn. I believe the error introduced when mulptiple CPUs of the same NUMA node step on each other is going to be unmeasurable. ACK the whole series. Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx> Thanks, Andrea -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>