RFR(M): 8234599: PPC64: Add support on recent CPUs and Linux for JEP-352

[Gustavo Romero]

Hi Matthias,

On 12/11/2019 11:31 AM, Baesken, Matthias wrote:
> Hi Gustavo,   thanks for  posting this .
> I put  your change into our  internal  build+test queue .

Thanks a lot for testing it and catching the fastdebug assert() error. I'll send
a fix to it in v2 in conjunction to Martin's requests.


> We currently do not have something like you described ( a P9 QEMU VM (emulation)   with NVDIMM  support  )  in our test landscape, but
>   It does not hurt to have the patch in our builds/tests anyway ....

The change must work the same as on a POWER9 LPAR w/ vPMEM support, as described
in [1] (try to ignore the sales pitch heh). So in effect it works just like the
POWER9 QEMU VM I've tested: on QEMU it's file-backed on the host side, whilst
vPMEM it's DRAM/DIMM-backed on PowerVM side, and vPMEM is really performant
since it's a real HW.


Best regards,
Gustavo

[1] https://ibmsystemsmag.com/Power-Systems/8/2019/Delivering-Persistence-Performance