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Documentation: document the nosmt and smt s390 kernel parameters

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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>
This commit is contained in:
Sascha Silbe
2016-04-05 12:53:38 +02:00
committed by Martin Schwidefsky
parent 0227f7c42d
commit 52c48c51e6
1 changed files with 10 additions and 0 deletions
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10
Documentation/kernel-parameters.txt
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@@ -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>