Messages in this thread | | | Date | Fri, 28 Dec 2018 11:27:44 +0800 | From | Fengguang Wu <> | Subject | Re: [RFC][PATCH v2 01/21] e820: cheat PMEM as DRAM |
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On Thu, Dec 27, 2018 at 11:32:06AM -0800, Yang Shi wrote: >On Wed, Dec 26, 2018 at 9:13 PM Dan Williams <dan.j.williams@intel.com> wrote: >> >> On Wed, Dec 26, 2018 at 8:11 PM Fengguang Wu <fengguang.wu@intel.com> 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@intel.com> >> > >> >> > >> 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. > >It is correct. We already have Dave's patches + Dan's patch (added >target_node field) work on our machine which has SRAT.
Thanks for the correction. It looks my perception was out of date. So we can follow Dave+Dan's patches to create the PMEM NUMA nodes.
Thanks, Fengguang
>> >> 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 >> >
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