On Fri, Feb 12, 2016 at 11:04 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > On Mon, Sep 21, 2015 at 11:23 PM, Ingo Molnar <mingo@xxxxxxxxxx> wrote: >> So when memory hotplug removes a piece of physical memory from pagetable >> mappings, it also frees the underlying PGD entry. >> >> This complicates PGD management, so don't do this. We can keep the >> PGD mapped and the PUD table all clear - it's only a single 4K page >> per 512 GB of memory hotplugged. > > Ressurecting an ancient thread: I want this particular change to make > it (much) easier to make vmapped stacks work correctly. Could it be > applied by itself? > It's incomplete. pageattr.c has another instance of the same thing. I'll see if I can make it work, but I may end up doing something a little different. --Andy -- Andy Lutomirski AMA Capital Management, LLC -- 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>