On Wed, 14 Aug 2013 16:22:18 -0400 Chris Metcalf <cmetc...@tilera.com> wrote:
> This change makes lru_add_drain_all() only selectively interrupt > the cpus that have per-cpu free pages that can be drained. > > This is important in nohz mode where calling mlockall(), for > example, otherwise will interrupt every core unnecessarily. Changelog isn't very informative. I added this: : This is important on workloads where nohz cores are handling 10 Gb traffic : in userspace. Those CPUs do not enter the kernel and place pages into LRU : pagevecs and they really, really don't want to be interrupted, or they : drop packets on the floor. to attempt to describe the rationale for the patch. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
