* Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > 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. If so then mind picking up (and fixing ;-) tip:WIP.x86/mm in its entirety? It's well tested so shouldn't have too many easy to hit bugs. Feel free to rebase and restructure it, it's a WIP tree. I keep getting distracted with other things but I'd hate if this got dropped on the floor. Thanks, Ingo -- 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>