On Thu, Dec 04, 2014 at 03:15:27PM -0600, Christoph Lameter wrote: > On Thu, 4 Dec 2014, Al Viro wrote: > > > ... except that somebody has not known that and took refcounts on e.g. > > vfsmounts into percpu. With massive amounts of hilarity once docker folks > > started to test the workloads that created/destroyed those in large amounts. > > Well, vfsmounts being a performance issue is a bit weird and unexpected.
Docker usage is pretty wide-spread now, making what used to be siberia-cold paths hot enough to cause actual scalability issues. Besides, we're now using percpu_ref for things like aio and cgroup control structures which can be created and destroyed quite frequently. I don't think we can say these are "weird" use cases anymore. Thanks. -- tejun -- 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/
