[PATCH v3 0/2] eliminate redundant lsinitrd calls in dracut

[Ziyue Yang]

Currently in Fedora/RedHat dracut installs its fedora.conf.example
as the default config file, in which sysloglvl is set 5. This leads
to maxloglvl=5 in dracut calls, making unnecessary lsinitrd calls
during initramfs builds.

This patch makes use of --confdir arguments of dracut, creates temp
config directory before mkdumprd(dracut) calls. It appends sysloglvl=3
option by creating a 99-kdump.conf file in the temp config directory.

1) Before this patch
$ kdumpctl stop; touch /etc/kdump.conf; time kdumpctl start
kexec: unloaded kdump kernel
Stopping kdump: [OK]
Detected change(s) in the following file(s):
  /etc/kdump.conf
Rebuilding /boot/initramfs-4.13.0-0.rc1.git4.1.fc27.x86_64kdump.img
kexec: loaded kdump kernel
Starting kdump: [OK]
real    0m26.824s
user    0m9.958s
sys     0m15.106s

2) After this patch
$ kdumpctl stop; touch /etc/kdump.conf; time kdumpctl start
kexec: unloaded kdump kernel
Stopping kdump: [OK]
Detected change(s) in the following file(s):
  /etc/kdump.conf
Rebuilding /boot/initramfs-4.13.0-0.rc1.git4.1.fc27.x86_64kdump.img
kexec: loaded kdump kernel
Starting kdump: [OK]
real    0m20.420s
user    0m8.385s
sys     0m10.468s

Ziyue Yang (2):
  kdumpctl: lower dracut's sysloglvl to eliminate redundant lsinitrd
    calls
  kdump.conf: add help text for dracut_sysloglvl config item

 kdump-lib.sh | 19 +++++++++++++++++++
 kdump.conf   |  6 ++++++
 kdump.conf.5 |  7 +++++++
 kdumpctl     |  5 +++--
 4 files changed, 35 insertions(+), 2 deletions(-)

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2.9.3