[RFC PATCH 5/5] powerpc/mm/hash: Increase VA range to 256TB

Aneesh Kumar K.V aneesh.kumar at linux.vnet.ibm.com
Tue Feb 7 15:17:41 AEDT 2017

Benjamin Herrenschmidt <benh at kernel.crashing.org> writes:

> That's 48 bits. I would keep the limit at 47 without some explicit
> opt-in by applications. That's what users get on x86 and we know
> some GPUs have limits there.

The idea is to have linux personality values that will limit the
effective address to different memory range. By default max effective
address will be limited to 64TB. Applications can then extend this to
128TB or 512TB. So we will have two personality values PER_LINUX_128TB
and PER_LINUX_512TB ?


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