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Revert "Always set vm.zone_reclaim_mode = 3 in kdump kernel"

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This reverts commit 5633e83318.

vm.zone_reclaim_mode may cause trashing on some machines. And after
second thought, vm.zone_reclaim_mode is barely helpful for machines
with high mem stress, so just revert it.

Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Pingfan Liu <piliu@redhat.com>
This commit is contained in:
Kairui Song 2021-04-19 23:00:10 +08:00
parent 6137956f79
commit ee160bf04d
1 changed files with 5 additions and 7 deletions
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12
dracut-module-setup.sh
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@ -642,18 +642,16 @@ kdump_install_conf() {
rm -f ${initdir}/tmp/$$-kdump.conf
}
# Remove user custom configurations sysctl.conf & sysctl.d/*
# and apply some optimization for kdump
overwrite_sysctl_conf() {
# Default sysctl parameters should suffice for kdump kernel.
# Remove custom configurations sysctl.conf & sysctl.d/*
remove_sysctl_conf() {
# As custom configurations like vm.min_free_kbytes can lead
# to OOM issues in kdump kernel, avoid them
rm -f "${initdir}/etc/sysctl.conf"
rm -rf "${initdir}/etc/sysctl.d"
rm -rf "${initdir}/run/sysctl.d"
rm -rf "${initdir}/usr/lib/sysctl.d"
mkdir -p "${initdir}/etc/sysctl.d"
echo "vm.zone_reclaim_mode = 3" > "${initdir}/etc/sysctl.d/99-zone-reclaim.conf"
}
kdump_iscsi_get_rec_val() {
@ -944,7 +942,7 @@ kdump_install_systemd_conf() {
install() {
kdump_module_init
kdump_install_conf
overwrite_sysctl_conf
remove_sysctl_conf
if is_ssh_dump_target; then
kdump_install_random_seed