On Wed, Oct 08, 2014 at 02:10:50PM -0500, Alex Thorlton wrote: > Is this particular bug a known issue? Its not unexpected for me. > I've been trying to come up with > a simple way to fix the bug, but it's a bit difficult since we no longer > have a way to trace back to the task_struct that we're collapsing for > once we've reached get_page_from_freelist. I'm wondering if we might > want to make the cpuset check higher up in the call-chain and then pass > that nodemask down instead of sending a NULL nodemask, as we end up > doing in many (most?) situations. I can think of several problems with > that approach as well, but it's all I've come up with so far. > > The obvious workaround is to not isolate khugepaged to a cpuset, but > since we're allowed to do so, I think the thread should probably behave > appropriately when pinned to a cpuset. > > Any input on this issue is greatly appreciated. Thanks, guys! So for the numa thing we do everything from the affected tasks context. There was a lot of arguments early on that that could never really work, but here we are. Should we convert khugepaged to the same? Drive the whole thing from task_work? That would make this issue naturally go away. -- 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>