From fd1eccf9200db73bdbc257c9c10809ed1a4a83e0 Mon Sep 17 00:00:00 2001 From: Bhupesh Sharma Date: Mon, 27 May 2019 16:59:08 +0530 Subject: [PATCH] aarch64/kdump.sysconfig: Make config options similar to x86_64 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 Acked-by: Pingfan Liu --- kdump.sysconfig.aarch64 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kdump.sysconfig.aarch64 b/kdump.sysconfig.aarch64 index 0a6b14c..c72a040 100644 --- a/kdump.sysconfig.aarch64 +++ b/kdump.sysconfig.aarch64 @@ -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