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aarch64/kdump.sysconfig: Make config options similar to x86_64

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Looking at the difference of the x86_64 and aarch64 kdump.sysconfig
options for Fedora, one can see the following options which are
different:

Present in kdump.sysconfig.x86_64 but not in kdump.sysconfig.aarch64:
---------------------------------------------------------------------
 cgroup_disable=memory
 mce=off
 numa=off
 udev.children-max=2
 panic=10
 acpi_no_memhotplug
 transparent_hugepage=never
 nokaslr

Present in kdump.sysconfig.aarch64 but not in kdump.sysconfig.x86_64:
---------------------------------------------------------------------
 swiotlb=noforce

After going through all the options, it makes sense to add the
following options added to kdump.sysconfig.aarch64:

  KDUMP_COMMANDLINE_APPEND="cgroup_disable=memory udev.children-max=2
                            panic=10 irqpoll nr_cpus=1
			    swiotlb=noforce reset_devices"

This has helped reduce the memory footprint of crashkernel on several
aarch64 machines available in the beaker lab. For e.g. I was seeing
OOM issues on large aws ec2 instances with the default crashkernel size
of 512M, and I had to use an increased crashkernel size of 786M on the
same to boot the crash dump kernel.

Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
Acked-by: Pingfan Liu <piliu@redhat.com>
This commit is contained in:
Bhupesh Sharma 2019-05-27 16:59:08 +05:30 committed by Kairui Song
parent 3001788f4c
commit fd1eccf920
1 changed files with 1 additions and 1 deletions
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2
kdump.sysconfig.aarch64
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@ -21,7 +21,7 @@ KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet"
# This variable lets us append arguments to the current kdump commandline
# after processed by KDUMP_COMMANDLINE_REMOVE
KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 swiotlb=noforce reset_devices"
KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices cgroup_disable=memory udev.children-max=2 panic=10 swiotlb=noforce"
# Any additional kexec arguments required. In most situations, this should
# be left empty