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authorSascha Silbe <silbe@linux.vnet.ibm.com>2016-04-05 13:53:38 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-04-15 19:16:38 +0300
commit52c48c51e60c473ccedb4c8f428050041ca7076a (patch)
tree837842be8296b680f706b6bb92b23a6d7facb215 /Documentation/kernel-parameters.txt
parent0227f7c42d9e01b00ea8cbd635aaf92a09b54abc (diff)
downloadlinux-52c48c51e60c473ccedb4c8f428050041ca7076a.tar.xz
Documentation: document the nosmt and smt s390 kernel parameters
Commit 6c2ff84e979a ("s390: add SMT support") added the nosmt and smt early kernel parameters for restricting the use of symmetric multithreading (SMT). They are quite useful for debugging and testing, so document them. Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt10
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diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index ecc74fa4bfde..92435e7c5f55 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2538,6 +2538,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
nohugeiomap [KNL,x86] Disable kernel huge I/O mappings.
+ nosmt [KNL,S390] Disable symmetric multithreading (SMT).
+ Equivalent to smt=1.
+
noxsave [BUGS=X86] Disables x86 extended register state save
and restore using xsave. The kernel will fallback to
enabling legacy floating-point and sse state.
@@ -3695,6 +3698,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
1: Fast pin select (default)
2: ATC IRMode
+ smt [KNL,S390] Set the maximum number of threads (logical
+ CPUs) to use per physical CPU on systems capable of
+ symmetric multithreading (SMT). Will be capped to the
+ actual hardware limit.
+ Format: <integer>
+ Default: -1 (no limit)
+
softlockup_panic=
[KNL] Should the soft-lockup detector generate panics.
Format: <integer>