11:51 p.m.
v5:
- fix several typos found by Pingfan
- add Reviewed-by tags from Pingfan
- fix two bugs of updating /etc/default/grub
- the kernel parameter was hardcoded to crashkernel
- didn't take care of the case where a kernel parameter doesn't exist
in GRUB_CMDLINE_LINUX
v4:
- fixes suggested by Philipp
- fix the bug of always turning fadump off in "kdumpctl reset-crashkernel"
- no duplicate "echo -n"
- "&>/dev/null" replaced by "grep -q"
- wording improvements
- no longer check if the kernel path returned from "grubby --info"
physically exists so setting up crashkernel would work for osbuild
- fix the bug that couldn't switch between --fadump=on and
--fadump=nocma using "kdumpctl reset-crashkernel"
- add comments for "kdumpctl reset-crashkernel" to improve code
readability
v3:
- fixes suggested by Philipp
- fix incorrect usage of kdump_get_arch_recommend_crashkernel
- s/get_default_crashkernel/get-default-crashkernel
- no longer depends on grubby --update-kernel=ALL to update all
kernels' command line parameter and using a single loop to simplify
the code
- indentation issue fix
- commit message improvement
- update crashkernel-howto.txt as suggested by Dave
- CoreOS suppport
- makes "kdumpctl reset-crashkernel" work for CoreOS
- kdumpctl can't be run in RPM scriplet, disable it for
CoreOS
- set up kernel crashkernel for osbuild
v2:
- no longer address the swiotlb memory requirement when SME is enabled
- automatically reset crashkernel to default value only when the value
is set by kexec-tools before. So the crashkernel option to added to
kdump.conf is replaced auto_reset_crashkernel option instead
- multiple fixes suggested by Philipp including regex improvement, typo
fixes, grubby kernel path check and commit message improvements
- address the case where a kernel path is not
/boot/vmlinuz-{KERNEL_RELEASE}
- "kdumpctl fadump" dropped. Support fadump via
"kdumpctl reset-crashkernel [--fadump=[on|off|nocma]]" instead
The crashkernel=auto implementation in kernel space has been rejected
upstream [1]. The current user space implementation [2] [3] ships a
crashkernel.default but hasn't supported fadump. Meanwhile the
crashkernel.default implementation seems to be overly complex,
- the default kernel crashkernel value rarely changes. This is no
need to ship the same crashkernel.default default for every kernel
package of a architecture;
- when deciding the value of crashkernel for a new kernel, the
crashkernel.default of installed kernels and running kernel
is took into consideration (for the details, check
92-crashnernel.install).
According to Kairui [4], crashkernel.default per kernel package is to
accommodate kernel difference, for example, different kernels could be
built with different configurations thus different crashkernel values
are needed. But these should be minor cases and may not be sufficent to
justify the complexity of 92-crashkernel.install. Currently, we don't
know how a kernel debug/feature config would affect the crashkernel
value. Even if a kernel config may require much larger crashkernel, we
can address it in kexec-tools later.
There are are known cases that could lead to a larger crashkernel
including enabling SME, LUKS encryption and etc. But this patch set
would put them aside since they may be took care of in the kernel
space instead.
So this patch set would simply add support for fadump and move the
default kernel crashkernel from kernel package to kexec-tools,
- provide "kdumpctl get-default-crashkernel" for kdump-anaconda-addon
to get the default kernel crashkernel values for a specific
architecture (fadump is supported as well)
- re-write "kdumpctl reset-crashkernel" to support fadump
- introduce auto_reset_crashkernel which determines whether to reset
kernel crashkernel to new default value or not when kexec-tools updates
the default crashkernel value
Because the kernel hook /usr/lib/kernel/install.d/20-grub.install would
make the installed kernel inherit the kernel cmdline of current running
kernel i.e. /proc/cmdline, we only need to reset crashkernel when
kexec-tools increases the default crashkernel values.
[1]
https://lore.kernel.org/linux-mm/20210507010432.IN24PudKT%25akpm@linux-fo...
[2] https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1171
[3]
https://lists.fedoraproject.org/archives/list/kexec@lists.fedoraproject.o...
[4]
https://lists.fedoraproject.org/archives/list/kexec@lists.fedoraproject.o...
Coiby Xu (13):
update default crashkernel value
factor out kdump_get_arch_recommend_crashkernel
provide kdumpctl get-default-crashkernel for kdump_anaconda_addon and
RPM scriptlet
add a helper function to read kernel cmdline parameter from grubby
--info
add helper functions to get dump mode
add helper functions to get kernel path by kernel release and the path
of current running kernel
fix incorrect usage of rpm-ostree to update kernel command line
parameters
rewrite reset_crashkernel to support fadump and to used by RPM
scriptlet
introduce the auto_reset_crashkernel option to kdump.conf
try to reset kernel crashkernel when kexec-tools updates the default
crashkernel value
reset kernel crashkernel for the special case where the kernel is
updated right after kexec-tools
set up kernel crashkernel for osbuild in kernel hook
update crashkernel-howto
92-crashkernel.install | 135 +---------------
crashkernel-howto.txt | 125 +++-----------
kdump-lib.sh | 60 ++++---
kdump.conf | 7 +
kdump.conf.5 | 6 +
kdumpctl | 358 ++++++++++++++++++++++++++++++++++++++---
kdumpctl.8 | 19 ++-
kexec-tools.spec | 22 +++
8 files changed, 442 insertions(+), 290 deletions(-)
--
2.31.1