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Baoquan He 6563c70944 sysconfig: disable kfence in kdump kernel 
Resolves: https://issues.redhat.com/browse/RHEL-103429
Upstream: rhkdump/kdump-utils
Conflict: Need manually edit kdump.sysconfig files

commit ddb0bab1f7e1e43a802993aadad03f85a3c045a9
Author: Baoquan He <bhe@redhat.com>
Date:   Wed Jun 25 23:30:24 2025 +0800

    sysconfig: disable kfence in kdump kernel

    In the current fedora and RHEL, below config items related to kfence
    feature are set by default:

    ===
    CONFIG_HAVE_ARCH_KFENCE=y
    CONFIG_KFENCE=y
    CONFIG_KFENCE_SAMPLE_INTERVAL=100
    CONFIG_KFENCE_NUM_OBJECTS=255
    CONFIG_KFENCE_STRESS_TEST_FAULTS=0
    CONFIG_KFENCE_KUNIT_TEST=m
    ===

    With them set, on x86_64, it will cost 2M extra memory used for kfence when
    page size if 4K; while on arm64 with 64K page size, it will cost 32M extra
    memory. This doesn't take memory cost of initializing and running kfence
    itself into account, here only saying the kfence objects and guarded
    pages. However, it doesn't make any sense to have kfence in a kdump
    kernel. Hence, disable kfence in kdump kernel to save crashkernel
    memory.

Signed-off-by: Baoquan He <bhe@redhat.com>
2025-08-06 16:57:43 +08:00
tests Merged update from upstream sources 2020-11-20 12:35:49 +00:00
.editorconfig kdump-lib-initramfs.sh: prepare to be a POSIX compatible lib 2021-11-09 21:45:15 +08:00
.gitignore RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00
60-fadump.install fadump: add a kernel install hook to clean up fadump initramfs 2022-12-22 14:36:23 +08:00
60-kdump.install Write to /var/lib/kdump if $KDUMP_BOOTDIR not writable 2021-06-23 09:34:40 +08:00
92-crashkernel.install Prefix reset-crashkernel-{for-installed_kernel,after-update} with underscore 2022-10-27 14:47:57 +08:00
98-kexec.rules RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00
98-kexec.rules.ppc64 powerpc: update fadump sysfs node path 2023-09-21 15:06:07 +08:00
99-kdump.conf 99-kdump.conf: Omit clevis related dracut modules 2025-04-17 06:25:41 +00:00
crashkernel-howto.txt kdump-lib.sh: Reserve crashkernel by default for systems with 1G-2G memory 2025-06-06 11:31:15 +08:00
dracut-early-kdump-module-setup.sh dracut-early-kdump-module-setup.sh: install xargs and kdump-lib-initramfs.sh 2022-01-06 14:31:33 +08:00
dracut-early-kdump.sh powerpc: update kdumpctl to load kernel signing key for fadump 2023-11-08 01:36:58 +00:00
dracut-fadump-init-fadump.sh fadump-init: clean up mount points properly 2021-07-20 15:43:43 +08:00
dracut-fadump-module-setup.sh fadump: isolate fadump initramfs image within the default one 2021-07-20 15:43:11 +08:00
dracut-kdump-capture.service RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00
dracut-kdump-emergency.service Merge kdump-error-handler.sh into kdump.sh 2021-11-09 21:45:31 +08:00
dracut-kdump-emergency.target RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00
dracut-kdump.sh Re-introduce vmcore creation notification to kdump 2024-12-06 15:27:20 +13:00
dracut-module-setup.sh Support dumping to NVMe/TCP configured using NVMe Boot Firmware Table 2025-07-31 10:15:52 +08:00
dracut-monitor_dd_progress RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00
early-kdump-howto.txt RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00
fadump-howto.txt fadump: pass additional parameters for capture kernel 2024-12-09 21:45:00 +08:00
gating.yaml Add gating.yaml to RHEL-9 kexec-tools 2021-06-08 20:03:41 +08:00
gen-kdump-conf.sh Note user-specified crashkernel value will be overwritten by default value 2025-02-24 11:02:47 +08:00
kdump-dep-generator.sh Merged update from upstream sources 2021-01-22 08:12:00 +00:00
kdump-in-cluster-environment.txt RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00
kdump-lib-initramfs.sh Re-introduce vmcore creation notification to kdump 2024-12-06 15:27:20 +13:00
kdump-lib.sh kdump-lib.sh: Reserve crashkernel by default for systems with 1G-2G memory 2025-06-06 11:31:15 +08:00
kdump-logger.sh Add header comment for POSIX compliant scripts 2021-11-10 10:26:54 +08:00
kdump-migrate-action.sh kdump/ppc64: rebuild initramfs image after migration 2021-12-03 18:13:09 +08:00
kdump-restart.sh kdump/ppc64: rebuild initramfs image after migration 2021-12-03 18:13:09 +08:00
kdump-udev-throttler RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00
kdump.conf.5 doc/kdump.conf: correctly align the options 2025-04-08 17:33:14 +02:00
kdump.service kdump.service: Replace ConditionKernelCommandLine with ExecCondition 2025-01-09 11:56:38 +08:00
kdump.sysconfig sysconfig: disable kfence in kdump kernel 2025-08-06 16:57:43 +08:00
kdump.sysconfig.aarch64 sysconfig: disable kfence in kdump kernel 2025-08-06 16:57:43 +08:00
kdump.sysconfig.i386 sysconfig: disable kfence in kdump kernel 2025-08-06 16:57:43 +08:00
kdump.sysconfig.ppc64 sysconfig: disable kfence in kdump kernel 2025-08-06 16:57:43 +08:00
kdump.sysconfig.ppc64le sysconfig: disable kfence in kdump kernel 2025-08-06 16:57:43 +08:00
kdump.sysconfig.s390x sysconfig: disable kfence in kdump kernel 2025-08-06 16:57:43 +08:00
kdump.sysconfig.x86_64 sysconfig: disable kfence in kdump kernel 2025-08-06 16:57:43 +08:00
kdumpctl kdumpctl: check and generate /etc/vconsole.conf 2025-06-09 13:25:26 +08:00
kdumpctl.8 Re-introduce vmcore creation notification to kdump 2024-12-06 15:27:20 +13:00
kexec_file-add-kexec_file-flag-to-support-debug-prin.patch kexec_file: add kexec_file flag to support debug printing 2024-05-07 20:26:22 +08:00
kexec-kdump-howto.txt kdumpctl: Drop default kexec '-d' option 2024-07-11 11:34:26 +02:00
kexec-tools.spec Release 2.0.29-9 2025-08-01 12:51:06 +12:00
kexec-update-manpage-with-explicit-mention-of-clean-.patch kexec: update manpage with explicit mention of clean kexec 2023-10-31 13:21:58 +08:00
live-image-kdump-howto.txt RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00
mkdumprd Revert "Introduce vmcore creation notification to kdump" 2024-12-06 11:25:25 +13:00
mkdumprd.8 Merged update from upstream sources 2020-12-23 10:00:07 +00:00
mkfadumprd fadump: use 'zstd' as the default compression method 2022-12-22 14:36:23 +08:00
README RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00
sources Release 2.0.29-1 2024-11-06 16:27:38 +13:00
supported-kdump-targets.txt Support dumping to NVMe/TCP configured using NVMe Boot Firmware Table 2025-07-31 10:15:52 +08:00
zanata-notes.txt RHEL 9.0.0 Alpha bootstrap 2020-10-15 14:45:57 +02:00

README 

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