On Wed, Dec 26, 2018 at 8:11 PM Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote: > > On Wed, Dec 26, 2018 at 07:41:41PM -0800, Matthew Wilcox wrote: > >On Wed, Dec 26, 2018 at 09:14:47PM +0800, Fengguang Wu wrote: > >> From: Fan Du <fan.du@xxxxxxxxx> > >> > >> This is a hack to enumerate PMEM as NUMA nodes. > >> It's necessary for current BIOS that don't yet fill ACPI HMAT table. > >> > >> WARNING: take care to backup. It is mutual exclusive with libnvdimm > >> subsystem and can destroy ndctl managed namespaces. > > > >Why depend on firmware to present this "correctly"? It seems to me like > >less effort all around to have ndctl label some namespaces as being for > >this kind of use. > > Dave Hansen may be more suitable to answer your question. He posted > patches to make PMEM NUMA node coexist with libnvdimm and ndctl: > > [PATCH 0/9] Allow persistent memory to be used like normal RAM > https://lkml.org/lkml/2018/10/23/9 > > That depends on future BIOS. So we did this quick hack to test out > PMEM NUMA node for the existing BIOS. No, it does not depend on a future BIOS. Willy, have a look here [1], here [2], and here [3] for the work-in-progress ndctl takeover approach (actually 'daxctl' in this case). [1]: https://lkml.org/lkml/2018/10/23/9 [2]: https://lkml.org/lkml/2018/10/31/243 [3]: https://lists.01.org/pipermail/linux-nvdimm/2018-November/018677.html
