Re: powerpc/mm: Add a parameter to disable 1TB segs

On Tue, Jul 5, 2016 at 10:24 AM, Michael Neuling [off-list ref] wrote:

On Mon, 2016-07-04 at 16:09 +1000, Michael Ellerman wrote:

quoted

On Mon, 2016-04-07 at 00:44:04 UTC, Oliver O'Halloran wrote:

quoted

This patch adds the kernel command line parameter "no_tb_segs" which
forces the kernel to use 256MB rather than 1TB segments. Forcing the
use
of 256MB segments makes it considerably easier to test code that
depends
on an SLB miss occurring.

That's a fairly awful name :)

Can you call it "disable_1T_segments" ?


It should also be mentioned in Documentation/kernel-parameters.txt, with
emphasis that it's a debug option and powerpc only.

To that end, should we add "powerpc_" at the start of the option?

I don't think it's necessary. There are annotations in
kernel-parameters.txt that indicate what options are arch specific and
it looks like none of the existing architecture specific options are
prefixed.

Mikey