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authorOliver O'Halloran <oohall@gmail.com>2016-07-05 11:43:21 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2016-07-05 23:58:54 +1000
commitfaf7882962e78a4c8ebb846f4520c858ee184dca (patch)
tree968e11ff8ad806d4b2e4105c181460033e295df9 /Documentation/kernel-parameters.txt
parent799010244685334b34e674d354a1a71a3a6b6148 (diff)
downloadlinux-aarch64-faf7882962e78a4c8ebb846f4520c858ee184dca.tar.gz
powerpc/mm: Add a parameter to disable 1TB segs
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>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 82b42c958d1c..738bae4a5958 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -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.