On Tue, Aug 29, 2017 at 5:57 AM, Liang, Kan <kan.liang@xxxxxxxxx> wrote: >> >> Attached is an ALMOST COMPLETELY UNTESTED forward-port of those two >> patches, now without that nasty WQ_FLAG_ARRIVALS logic, because we now >> always put the new entries at the end of the waitqueue. > > The patches fix the long wait issue. > > Tested-by: Kan Liang <kan.liang@xxxxxxxxx> Ok. I'm not 100% comfortable applying them at rc7, so let me think about it. There's only one known load triggering this, and by "known" I mean "not really known" since we don't even know what the heck it does outside of intel and whoever your customer is. So I suspect I'll apply the patches next merge window, and we can maybe mark them for stable if this actually ends up mattering. Can you tell if the problem is actually hitting _production_ use or was some kind of benchmark stress-test? Linus -- 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>