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

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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.

Suggested-by: Michael Neuling <mikey@neuling.org>
Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Oliver O'Halloran
2016-07-05 11:43:21 +10:00
committed by Michael Ellerman
parent 7990102446
commit faf7882962
2 changed files with 21 additions and 0 deletions
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6
Documentation/kernel-parameters.txt
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@@ -920,6 +920,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
dhash_entries= [KNL]
Set number of hash buckets for dentry cache.
disable_1tb_segments [PPC]
Disables the use of 1TB hash page table segments. This
causes the kernel to fall back to 256MB segments which
can be useful when debugging issues that require an SLB
miss to occur.
disable= [IPV6]
See Documentation/networking/ipv6.txt.