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, 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>