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authorNishanth Aravamudan <nacc@linux.vnet.ibm.com>2014-10-10 09:04:49 -0700
committerMichael Ellerman <mpe@ellerman.id.au>2014-10-13 18:16:17 +1100
commit2d73bae12b26db6eba074b70406c707961b6cda9 (patch)
tree99ac1885683491bdeeb0dfb88195580cecddff62 /Documentation/kernel-parameters.txt
parent2d15b9b479512f05680541acffd9acbbc831a47c (diff)
powerpc/numa: Add ability to disable and debug topology updates
We have hit a few customer issues with the topology update code (VPHN and PRRN). It would be nice to be able to debug the notifications coming from the hypervisor in both cases to the LPAR, as well as to disable responding to the notifications at boot-time, to narrow down the source of the problems. Add a basic level of such functionality, similar to the numa= command-line parameter. We already have a toggle in /proc/powerpc/topology_updates that allows run-time enabling/disabling, so the updates can be started at run-time if desired. But the bugs we've run into have occured during boot or very shortly after coming to login, and have resulted in a broken NUMA topology. Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.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 10d51c2f10d7..c536e1c74320 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3370,6 +3370,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
e.g. base its process migration decisions on it.
Default is on.
+ topology_updates= [KNL, PPC, NUMA]
+ Format: {off}
+ Specify if the kernel should ignore (off)
+ topology updates sent by the hypervisor to this
+ LPAR.
+
tp720= [HW,PS2]
tpm_suspend_pcr=[HW,TPM]