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Date: Wed, 3 Aug 2016 10:31:35 +0800 From: Zhou Wenjian <zhouwj-fnst@...fujitsu.com> To: <linux-kernel@...r.kernel.org> CC: <kexec@...ts.infradead.org>, <bhe@...hat.com>, <dyoung@...hat.com>, <d.hatayama@...fujitsu.com> Subject: [PATCH v4 2/2] Documentation: kdump: add description of enable multi-cpus support multi-cpus support is useful to improve the performance of kdump in some cases. So add the description of enable multi-cpus support in dump-capture kernel. Signed-off-by: Zhou Wenjian <zhouwj-fnst@...fujitsu.com> --- Documentation/kdump/kdump.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt index b474060..028cf26 100644 --- a/Documentation/kdump/kdump.txt +++ b/Documentation/kdump/kdump.txt @@ -396,6 +396,13 @@ Notes on loading the dump-capture kernel: Note, though maxcpus always works, we should replace it by nr_cpus to save memory if supported by the current ARCH, such as x86. +* We should enable multi-cpus support in dump-capture kernel if we intend + to use multi-threads programs with it, such as parallel dump feature of + makedumpfile. Otherwise, the multi-threads program may have a great + performance degradation. To enable multi-cpus support, we should bring up + a SMP dump-capture kernel and specify maxcpus\nr_cpus, disable_cpu_apic=[X] + options while loading it. + * 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 is done on all other architectures. If no elfcorehdr= kernel parameter is -- 1.8.3.1
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