Re: powerpc/pseries: Use H_CLEAR_HPT to clear MMU hash table during kexec

On Sat, 2016-01-10 at 10:41:56 UTC, Anton Blanchard wrote:

From: Anton Blanchard <redacted>

An hcall was recently added that does exactly what we need
during kexec - it clears the entire MMU hash table, ignoring any
VRMA mappings.

Try it and fall back to the old method if we get a failure.

On a POWER8 box with 5TB of memory, this reduces the time it takes to
kexec a new kernel from from 4 minutes to 1 minute.

Signed-off-by: Anton Blanchard <redacted>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/5246adec59458b5d325b8e1462ea9e

cheers