On Tue, Aug 22, 2017 at 04:08:52PM -0500, Christopher Lameter wrote: > On Tue, 22 Aug 2017, Andi Kleen wrote: > > > We only see it on 4S+ today. But systems are always getting larger, > > so what's a large system today, will be a normal medium scale system > > tomorrow. > > > > BTW we also collected PT traces for the long hang cases, but it was > > hard to find a consistent pattern in them. > > Hmmm... Maybe it would be wise to limit the pages autonuma can migrate? > > If a page has more than 50 refcounts or so then dont migrate it. I think > high number of refcounts and a high frequewncy of calls are reached in > particular for pages of the c library. Attempting to migrate those does > not make much sense anyways because the load may shift and another > function may become popular. We may end up shifting very difficult to > migrate pages back and forth. I believe in this case it's used by threads, so a reference count limit wouldn't help. If migrating code was a problem I would probably rather just disable migration of read-only pages. -Andi -- 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>
