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kdump-load/config: Add config option to override custom kdump kernel cmdline

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Also document a bit better why some parameters are added and why
we remove huge pages parameters, for example.

Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
This commit is contained in:
Guilherme G. Piccoli
2023-01-19 10:58:09 -03:00
parent dc4e6b964c
commit 90b30b6d5d
2 changed files with 11 additions and 4 deletions
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8
00-default.conf
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@ -35,10 +35,16 @@ MOUNT_FOLDER="/home/.steamos/offload/var/kdump"
# If FULL_COREDUMP is !=0, we collect a full compressed vmcore, which might
# require a lot of disk space. The MAKEDUMPFILE_*_CMD settings refer to
# tunings on makedumpfile - we rely on zstd compression and maximum page
# exclusion for the full vmcore, mimic'ing Debian/Ubuntu kdump.
# exclusion for the full vmcore, mimic'ing Debian/Ubuntu kdump. We also
# base on Debian/Ubuntu for the KDUMP_CMDLINE_APPEND option - this contains
# the kernel parameters we append in the /proc/cmdline for the kdump kernel;
# the most important parameters are nr_cpus=1 (to save RAM memory usage and
# avoid some potential issues with SMP) and reset_devices (some drivers
# rely on that for proper kdump).
FULL_COREDUMP=0
MAKEDUMPFILE_COREDUMP_CMD="-z -d 31"
MAKEDUMPFILE_DMESG_CMD="--dump-dmesg"
KDUMP_APPEND_CMDLINE="panic=-1 oops=panic fsck.mode=force fsck.repair=yes nr_cpus=1 reset_devices"
#
#
# GRUB-related settings

7
kdump-load.sh.in
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@ -177,10 +177,11 @@ fi
cleanup_unused_initrd
grub_update kdump
# After some consideration, we've stolen the kdump parameters from
# Debian/Ubuntu implementation, it makes sense for us.
# The kdump kernel command-line has some parameters appended, check
# the configuration files in order to change that. We also remove huge
# pages settings here (and crashkernel reservation), to save memory on kdump.
KDUMP_CMDLINE=$(sed -re 's/(^| )(crashkernel|hugepages|hugepagesz)=[^ ]*//g;s/"/\\\\"/' /proc/cmdline)
KDUMP_CMDLINE="${KDUMP_CMDLINE} panic=-1 oops=panic fsck.mode=force fsck.repair=yes nr_cpus=1 reset_devices"
KDUMP_CMDLINE="${KDUMP_CMDLINE} ${KDUMP_APPEND_CMDLINE}"
# To obtain the vmlinux binary path, try first using directly the command-line
# information. If it fails, then attempt prepending /boot into that (faced