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Kairui Song 6b479b6572 kdumpctl: Rebuild initramfs if loaded kernel modules changed 
Currently, we only rebuilt kdump initramfs on config file change,
fs change, or watchdog related change. This will not cover the case
that hardware changed but fs layout and other configurations still
stays the same, and kdump may fail.

To cover such case, we can detect and compare loaded kernel modules,
if a hardware change requires the image to be rebuilt, loaded kernel
modules must have changed.

Starting from commit 7047294 dracut will record loaded kernel modules
when the image is built if hostonly mode is enabled.  With this patch,
kdumpctl will compare the recorded value with currently loaded kernel
modules, and rebuild the image on change.

"kdumpctl start" will be a bit slower, as we have to call lsinitrd one
more time to get the loaded kernel modules list. I measure the time
consumption and we have an overall 0.2s increased loading time.

Time consumption of command "kdumpctl restart":

Before:
real    0m0.587s
user    0m0.481s
sys     0m0.102s

After:
real    0m0.731s
user    0m0.591s
sys     0m0.133s

Time comsumption of command "kdumpctl restart" with image rebuild:

Before (force rebuild):
real    0m10.972s
user    0m8.966s
sys     0m1.318s

After (inserted ~100 new modules):
real    0m11.220s
user    0m9.387s
sys     0m1.337s

Signed-off-by: Kairui Song <kasong@redhat.com>
2018-07-26 19:25:09 +08:00
anaconda-addon Rename the subpackage kdump-anaconda-addon 2014-05-22 18:32:43 +08:00
.gitignore .gitignore: Update to make it more generic 2016-05-16 10:15:01 +08:00
98-kexec.rules Revert "Improve 'cpu add' udev rules" 2017-08-17 16:42:11 +08:00
dracut-early-kdump-module-setup.sh Add early kdump support in initramfs. 2018-05-29 10:19:19 +08:00
dracut-early-kdump.sh Add early kdump support in initramfs. 2018-05-29 10:19:19 +08:00
dracut-kdump-capture.service Introduce kdump capture service 2014-08-05 13:13:32 +08:00
dracut-kdump-emergency.service kdump-emergency: fix "Transaction is destructive" emergency failure 2017-03-31 11:54:30 +08:00
dracut-kdump-emergency.target kdump-emergency: fix "Transaction is destructive" emergency failure 2017-03-31 11:54:30 +08:00
dracut-kdump-error-handler.service Introduce kdump error handling service 2014-08-05 13:13:32 +08:00
dracut-kdump-error-handler.sh Revert "execute kdump_post after do_default_action" 2015-04-08 15:50:16 +08:00
dracut-kdump.sh dracut-kdump: use POSIX shell syntax 2016-11-28 10:41:15 +08:00
dracut-module-setup.sh dracut-module-setup.sh: pass ip=either6 param for ipv6 2018-07-09 12:43:28 +08:00
dracut-monitor_dd_progress monitor-dd-progress fix 2013-06-25 16:45:59 +08:00
early-kdump-howto.txt Add early kdump support in initramfs. 2018-05-29 10:19:19 +08:00
fadump-howto.txt Document: fix incorrect link in fadump-how.txt 2017-03-08 13:07:20 +08:00
kdump-dep-generator.sh kdump-dep-generator: Add kdump service dependencies on the fly 2014-04-17 11:27:31 +08:00
kdump-in-cluster-environment.txt Add fence_kdump support for generic clusters 2014-04-03 14:43:06 +08:00
kdump-lib-initramfs.sh kdump-lib-initramfs.sh: ignore the failure of echo 2017-04-27 13:59:49 +08:00
kdump-lib.sh move some common functions from kdumpctl to kdump-lib.sh 2018-05-29 10:18:40 +08:00
kdump.conf kdumpctl: for fence_kdump, the ipaddr of this node should be excluded from list 2017-05-18 16:44:42 +08:00
kdump.conf.5 kdump.conf.5: clarify the fence_kdump_nodes option 2017-06-09 09:47:22 +08:00
kdump.service make kdump work when kernel crash after shutdown 2015-06-03 21:10:34 +08:00
kdump.sysconfig Remove kernel param "quiet" from kdump kernel cmdline 2015-12-11 15:18:31 +08:00
kdump.sysconfig.i386 Remove kernel param "quiet" from kdump kernel cmdline 2015-12-11 15:18:31 +08:00
kdump.sysconfig.ppc64 kdump.sysconfig.ppc64(le): remove "root=" param from ppc64(le) 2nd kernel's command line 2018-03-22 16:15:08 +08:00
kdump.sysconfig.ppc64le kdump.sysconfig.ppc64(le): remove "root=" param from ppc64(le) 2nd kernel's command line 2018-03-22 16:15:08 +08:00
kdump.sysconfig.s390x Remove kernel param "quiet" from kdump kernel cmdline 2015-12-11 15:18:31 +08:00
kdump.sysconfig.x86_64 kdump.sysconfig/x86_64: Add nokaslr to kdump kernel cmdline 2017-04-27 13:59:49 +08:00
kdumpctl kdumpctl: Rebuild initramfs if loaded kernel modules changed 2018-07-26 19:25:09 +08:00
kdumpctl.8 kdumpctl: add showmem cmd 2018-05-21 14:06:30 +08:00
kexec-kdump-howto.txt kexec-kdump-howto: Add doc about the special mount information via "dracut_args" 2016-08-26 14:03:48 +08:00
kexec-tools-2.0.3-disable-kexec-test.patch Disable kexec_test 2012-01-21 16:56:07 +08:00
kexec-tools-2.0.16-koji-build-fail-workaround.patch Workaround a koji build failure 2017-12-08 11:42:30 +08:00
kexec-tools.spec - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild 2018-07-13 07:00:01 +00:00
live-image-kdump-howto.txt Revert "kdumpctl: filter 'root' kernel parameter when running in live images" 2017-04-11 16:03:12 +08:00
mkdumprd Revert "Use absolute path /usr/bin/dracut in mkdumprd" 2017-11-09 15:29:22 +08:00
mkdumprd.8 Remove comma which is redundant 2013-02-16 15:19:41 +08:00
README README: Add a README file 2014-04-02 10:45:36 +08:00
sources Update makedumpfile 1.6.4 2018-07-09 12:45:31 +08:00
zanata-notes.txt Add a notes for zanata process 2012-12-05 01:23:09 -05:00

README 

Adding a patch to kexec-tools
=============================
There is a mailing list kexec@lists.fedoraproject.org where all the dicussion
related to fedora kexec-tools happen. All the patches are posted there for
inclusion and committed to kexec-tools after review.

So if you want your patches to be included in fedora kexec-tools package,
post these to kexec@lists.fedoraproject.org.

One can subscribe to list and browse through archives here.

https://admin.fedoraproject.org/mailman/listinfo/kexec