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Li Wang 0aada50b66 Disable transparent hugepages in second kernel 
Transparent hugepages are on by default. Disable it in kdump kernel by
adding the parameter 'transparent_hugepage=never'. This might help us
with some of the memory issues we are facing.

From my test on two arch, not only there are no any bad effect on saving vmcore
after turn off THP, but also we can get more 'MemAvailable:' in the kdump kernel.

1)x86_64
without the parameter
=====================
kdump:/# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.10.0-229.el7.x86_64 root=/dev/mapper/rhel_ibm--x3250m4--01-root ro rd.lvm.lv=rhel_ibm-x3250m4-01/swap console=ttyS0,115200n8 rd.lvm.lv=rhel_ibm-x3250m4-01/root LANG=en_US.UTF-8 irqpoll nr_cpus=1 reset_devices cgroup_disable=memory mce=off numa=off udev.children-max=2 panic=10 rootflags=nofail acpi_no_memhotplug disable_cpu_apicid=0 elfcorehdr=869764K

kdump:/# cat /proc/meminfo
MemTotal:         145492 kB
MemFree:           68284 kB
MemAvailable:     111632 kB  <<------
Buffers:              36 kB
Cached:            48184 kB
...

added the parameter
=====================
kdump:/# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.10.0-229.el7.x86_64 root=/dev/mapper/rhel_ibm--x3250m4--01-root ro rd.lvm.lv=rhel_ibm-x3250m4-01/swap console=ttyS0,115200n8 rd.lvm.lv=rhel_ibm-x3250m4-01/root LANG=en_US.UTF-8 irqpoll nr_cpus=1 reset_devices cgroup_disable=memory mce=off numa=off udev.children-max=2 panic=10 rootflags=nofail acpi_no_memhotplug transparent_hugepage=never disable_cpu_apicid=0 elfcorehdr=869764K

kdump:/# cat /proc/meminfo
MemTotal:         145492 kB
MemFree:           68388 kB
MemAvailable:     111728 kB  <<-------
...
VmallocChunk:   34359659520 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
...

2)ppc64
without the parameter
====================
kdump:/# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.10.0-229.el7.ppc64 root=/dev/mapper/rhel_ibm--p8--05--lp6-root ro rd.lvm.lv=rhel_ibm-p8-05-lp6/root rd.lvm.lv=rhel_ibm-p8-05-lp6/swap LANG=en_US.UTF-8 irqpoll maxcpus=1 noirqdistrib reset_devices cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10 rootflags=nofail kvm_cma_resv_ratio=0 elfcorehdr=154880K

kdump:/# cat /proc/meminfo
MemTotal:         480832 kB
MemFree:          293952 kB
MemAvailable:     427840 kB  <<--------
mallocUsed:       23680 kB
VmallocChunk:   8589901824 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
...

added the parameter
===================
kdump:/# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.10.0-229.el7.ppc64 root=/dev/mapper/rhel_ibm--p8--05--lp6-root ro rd.lvm.lv=rhel_ibm-p8-05-lp6/root rd.lvm.lv=rhel_ibm-p8-05-lp6/swap LANG=en_US.UTF-8 irqpoll maxcpus=1 noirqdistrib reset_devices cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10 rootflags=nofail kvm_cma_resv_ratio=0 transparent_hugepage=never elfcorehdr=154880K

kdump:/# cat /proc/meminfo
MemTotal:         480832 kB
MemFree:          294592 kB
MemAvailable:     428480 kB  <<-------
...
HugePages_Total:       0

Signed-off-by: Li Wang <liwang@redhat.com>
Acked-by: Minfei Huang <mhuang@redhat.com>
Acked-by: Baoquan He <bhe@redaht.com>
2015-06-03 21:07:22 +08:00
anaconda-addon Rename the subpackage kdump-anaconda-addon 2014-05-22 18:32:43 +08:00
.gitignore Release 2.0.8-8 2015-02-15 14:39:31 +08:00
98-kexec.rules udev-rules: Restart kdump service on cpu ADD/REMOVE events 2014-09-15 21:55:07 +08:00
dracut-kdump-capture.service Introduce kdump capture service 2014-08-05 13:13:32 +08:00
dracut-kdump-emergency.service kdump-emergency.service: executable uses absolute path 2014-08-28 13:05:56 +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 Revert "execute kdump_post after do_default_action" 2015-04-08 15:50:16 +08:00
dracut-module-setup.sh dracut-module-setup: Enhance kdump to support the bind mounted feature in Atomic 2015-04-21 10:58:30 +08:00
dracut-monitor_dd_progress monitor-dd-progress fix 2013-06-25 16:45:59 +08:00
fadump-howto.txt kdump: Add firmware-assisted dump howto document 2014-07-28 13:03:51 +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 Revert "execute kdump_post after do_default_action" 2015-04-08 15:50:16 +08:00
kdump-lib.sh Fix the warning if the target path is bind mount in Atomic 2015-04-21 10:58:00 +08:00
kdump.conf kdump.conf: renew the path section 2014-04-17 11:27:31 +08:00
kdump.conf.5 kdump.conf: renew the path section 2014-04-17 11:27:31 +08:00
kdump.service Disable the ratelimit of kdump service on hotplug events 2014-05-04 17:08:14 +08:00
kdump.sysconfig do not mount root twice 2012-07-12 11:15:35 +08:00
kdump.sysconfig.i386 Disable transparent hugepages in second kernel 2015-06-03 21:07:22 +08:00
kdump.sysconfig.ppc64 Disable transparent hugepages in second kernel 2015-06-03 21:07:22 +08:00
kdump.sysconfig.ppc64le Disable transparent hugepages in second kernel 2015-06-03 21:07:22 +08:00
kdump.sysconfig.s390x Disable transparent hugepages in second kernel 2015-06-03 21:07:22 +08:00
kdump.sysconfig.x86_64 Disable transparent hugepages in second kernel 2015-06-03 21:07:22 +08:00
kdumpctl kdump-lib: Add new function to judge the system is Atomic or not 2015-04-21 10:57:28 +08:00
kexec-kdump-howto.txt kdumpctl: adjust the boot dir if kernel is put in sub dir of /boot 2015-01-30 14:53:34 +08:00
kexec-tools-2.0.3-disable-kexec-test.patch Disable kexec_test 2012-01-21 16:56:07 +08:00
kexec-tools-2.0.7-kexec-ppc64-disabling-exception-handling-when-buildi.patch kexec/ppc64: disabling exception handling when building the purgatory 2014-09-15 21:55:02 +08:00
kexec-tools-2.0.7-kexec-ppc64-move-to-device-tree-version-17.patch kexec/ppc64: move to device tree version 17 2014-09-15 21:54:47 +08:00
kexec-tools-2.0.7-ppc64-kdump-Fix-ELF-header-endianess.patch ppc64/kdump: Fix ELF header endianess 2014-09-15 21:55:04 +08:00
kexec-tools-2.0.7-Provide-an-option-to-use-new-kexec-system-call.patch kexec: Provide an option to use new kexec system call 2014-09-10 10:44:24 +08:00
kexec-tools.spec Release 2.0.8-10 2015-04-21 11:15:50 +08:00
mkdumprd Filtered out "noauto" options in 2nd kernel fstab 2015-06-03 21:05:56 +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
rhcrashkernel-param rhcrashkernel-param: echo crashkernel=auto for rhel7 2012-08-20 15:01:47 +08:00
sources Release 2.0.8-8 2015-02-15 14:39:31 +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