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Documentation: kdump: Add description of enable multi-cpus support

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Multi-cpu support is useful to improve the performance of kdump in
some cases. So add the description of enable multi-cpu support in
dump-capture kernel.

Signed-off-by: Zhou Wenjian <zhouwj-fnst@cn.fujitsu.com>
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Xunlei Pang <xpang@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Zhou Wenjian 2016-09-19 13:59:49 +08:00 committed by Jonathan Corbet
parent 3dfb4c1bf0
commit ebf137f670
1 changed files with 7 additions and 0 deletions
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Documentation/kdump/kdump.txt
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@ -396,6 +396,13 @@ Notes on loading the dump-capture kernel:
Note, though maxcpus always works, you had better replace it with Note, though maxcpus always works, you had better replace it with
nr_cpus to save memory if supported by the current ARCH, such as x86. nr_cpus to save memory if supported by the current ARCH, such as x86.
* You should enable multi-cpu support in dump-capture kernel if you intend
to use multi-thread programs with it, such as parallel dump feature of
makedumpfile. Otherwise, the multi-thread program may have a great
performance degradation. To enable multi-cpu support, you should bring up an
SMP dump-capture kernel and specify maxcpus/nr_cpus, disable_cpu_apicid=[X]
options while loading it.
* For s390x there are two kdump modes: If a ELF header is specified with * For s390x there are two kdump modes: If a ELF header is specified with
the elfcorehdr= kernel parameter, it is used by the kdump kernel as it the elfcorehdr= kernel parameter, it is used by the kdump kernel as it
is done on all other architectures. If no elfcorehdr= kernel parameter is is done on all other architectures. If no elfcorehdr= kernel parameter is