Messages in this thread | | | Subject | Re: [RFC] Memory Tiering | From | Dave Hansen <> | Date | Thu, 17 Oct 2019 07:17:05 -0700 |
| |
On 10/17/19 1:07 AM, David Hildenbrand wrote: > Very interesting topic. I heard similar demand from HPC folks > (especially involving other memory types ("tiers")). There, I think > you often want to let the application manage that. But of course, for > many applications an automatic management might already be > beneficial. > > Am I correct that you are using PMEM in this area along with > ZONE_DEVICE and not by giving PMEM to the buddy (add_memory())?
The PMEM starts out as ZONE_DEVICE, but we unbind it from its original driver and bind it to this stub of a "driver": drivers/dax/kmem.c which uses add_memory() on it.
There's some nice tooling inside the daxctl component of ndctl to do all the sysfs magic to make this happen.
| |