kexec July 2021

kexec@lists.fedoraproject.org

6 participants
23 discussions

[PATCH v3 0/4] Add support for crashkernel.default
by Kairui Song 07 Jul '21

07 Jul '21

In RHEL, kernel supports a `crashkernel=auto` param and when it's used, kernel will use its built-in default value as the crashkernel value. But upstream doesn't like this idea. [1] `crashkernel=auto` was introduced to provide user a default value, and make it possible to update the crashkernel value automatically as kernel package updates if user is using the default `auto` value. After more discussion, `crashkernel=auto` will be dropped. To track the default crashkernel value, kernel package will include a crashkernel.default file with it[2], and kexec-tools can make use of that file, update kernel's boot cmdline accordingly, and help user to reset the crashkernel value to default value. [1]: https://lore.kernel.org/linux-mm/20210507010432.IN24PudKT%25akpm@linux-foun… [2]: https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1171 Update from V2: - Update the doc as suggested by Baoquan - Fix some comment and code issues in 92-crashkernel.install Update from V1: - Add support for ostree - Add a crashkernel-howto.txt - Change crashkernel.conf to crashkernel.default Kairui Song (4): Revert "kdump-lib.sh: Remove is_atomic" kdumpctl: Add kdumpctl reset-crashkernel Add a new hook: 92-crashkernel.install Add a crashkernel-howto.conf doc 92-crashkernel.install | 143 +++++++++++++++++++++++++++++ crashkernel-howto.conf | 204 +++++++++++++++++++++++++++++++++++++++++ kdump-lib.sh | 5 + kdumpctl | 41 ++++++++- kdumpctl.8 | 9 ++ kexec-tools.spec | 7 ++ 6 files changed, 407 insertions(+), 2 deletions(-) create mode 100755 92-crashkernel.install create mode 100644 crashkernel-howto.conf -- 2.31.1

2 5

[PATCH v2 0/4] Add support for crashkernel.default
by Kairui Song 02 Jul '21

02 Jul '21

In RHEL, kernel supports a `crashkernel=auto` param and when it's used, kernel will use its built-in default value as the crashkernel value. But upstream doesn't like this idea. [1] `crashkernel=auto` was introduced to provide user a default value, and make it possible to update the crashkernel value automatically as kernel package updates if user is using the default `auto` value. After more discussion, `crashkernel=auto` will be dropped. To track the default crashkernel value, kernel package will include a crashkernel.default file with it[2], and kexec-tools can make use of that file, update kernel's boot cmdline accordingly, and help user to reset the crashkernel value to default value. [1]: https://lore.kernel.org/linux-mm/20210507010432.IN24PudKT%25akpm@linux-foun… [2]: https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1171 Update from V1: - Add support for ostree - Add a crashkernel-howto.txt - Change crashkernel.conf to crashkernel.default Kairui Song (4): Revert "kdump-lib.sh: Remove is_atomic" kdumpctl: Add kdumpctl reset-crashkernel Add a new hook: 92-crashkernel.install Add a crashkernel-howto.conf doc 92-crashkernel.install | 131 +++++++++++++++++++++++++++++++++++++++++ crashkernel-howto.conf | 113 +++++++++++++++++++++++++++++++++++ kdump-lib.sh | 5 ++ kdumpctl | 41 ++++++++++++- kdumpctl.8 | 9 +++ kexec-tools.spec | 7 +++ 6 files changed, 304 insertions(+), 2 deletions(-) create mode 100755 92-crashkernel.install create mode 100644 crashkernel-howto.conf -- 2.31.1

2 6

[PATCH] kdump-lib.sh: kdump_get_arch_recommend_size uses crashkernel.default
by Kairui Song 02 Jul '21

02 Jul '21

The new `crashkernel.default` file in kernel package can be used as the ck_cmdline source. Also keep the legacy code so old kernel packages will still work. Signed-off-by: Kairui Song <kasong(a)redhat.com> --- kdump-lib.sh | 39 ++++++++++++++++++++++++--------------- 1 file changed, 24 insertions(+), 15 deletions(-) diff --git a/kdump-lib.sh b/kdump-lib.sh index df0aa02..4bd9751 100755 --- a/kdump-lib.sh +++ b/kdump-lib.sh @@ -952,31 +952,40 @@ get_recommend_size() } # return recommended size based on current system RAM size +# $1: kernel version, if not set, will defaults to `uname -r` kdump_get_arch_recommend_size() { - if ! [[ -r "/proc/iomem" ]] ; then + local kernel=$1 arch + + if ! [ -r "/proc/iomem" ] ; then echo "Error, can not access /proc/iomem." return 1 fi - arch=$(lscpu | grep Architecture | awk -F ":" '{ print $2 }' | tr [:lower:] [:upper:]) - - if [ $arch == "X86_64" ] || [ $arch == "S390X" ]; then - ck_cmdline="1G-4G:160M,4G-64G:192M,64G-1T:256M,1T-:512M" - elif [ $arch == "AARCH64" ]; then - ck_cmdline="2G-:448M" - elif [ $arch == "PPC64LE" ]; then - if is_fadump_capable; then - ck_cmdline="4G-16G:768M,16G-64G:1G,64G-128G:2G,128G-1T:4G,1T-2T:6G,2T-4T:12G,4T-8T:20G,8T-16T:36G,16T-32T:64G,32T-64T:128G,64T-:180G" - else - ck_cmdline="2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G" + + [ -z "$kernel" ] && kernel=$(uname -r) + ck_cmdline=$(cat "/usr/lib/modules/$kernel/crashkernel.default" 2>/dev/null) + + if [ -n "$ck_cmdline" ]; then + ck_cmdline=${ck_cmdline#crashkernel=} + else + arch=$(lscpu | grep Architecture | awk -F ":" '{ print $2 }' | tr '[:lower:]' '[:upper:]') + if [ "$arch" = "X86_64" ] || [ "$arch" = "S390X" ]; then + ck_cmdline="1G-4G:160M,4G-64G:192M,64G-1T:256M,1T-:512M" + elif [ "$arch" = "AARCH64" ]; then + ck_cmdline="2G-:448M" + elif [ "$arch" = "PPC64LE" ]; then + if is_fadump_capable; then + ck_cmdline="4G-16G:768M,16G-64G:1G,64G-128G:2G,128G-1T:4G,1T-2T:6G,2T-4T:12G,4T-8T:20G,8T-16T:36G,16T-32T:64G,32T-64T:128G,64T-:180G" + else + ck_cmdline="2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G" + fi fi fi ck_cmdline=$(echo $ck_cmdline | sed -e 's/-:/-102400T:/g') sys_mem=$(get_system_size) - result=$(get_recommend_size $sys_mem "$ck_cmdline") - echo $result - return 0 + + get_recommend_size "$sys_mem" "$ck_cmdline" } # Print all underlying crypt devices of a block device -- 2.31.1

2 1

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

kexec July 2021