[PATCHv2] kdumpctl: add showmem cmd
port from rhel, original patch is contributed by Minfei Huang:
If the grub kernel commandline is set to crashkernel=auto, it will not
expand the crashkernel=auto in the /proc/cmdline. It still says
crashkernel=auto.
Using /sys to determines crashkernel actual size is confusing since
there is no unit of measure.
Add a new command "kdumpctl showmem" to show the reserved memory kindly.
Signed-off-by: Pingfan Liu <piliu(a)redhat.com>
---
kdumpctl | 13 ++++++++++++-
kdumpctl.8 | 3 +++
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/kdumpctl b/kdumpctl
index cebca36..1279d72 100755
--- a/kdumpctl
+++ b/kdumpctl
@@ -830,6 +830,14 @@ propagate_ssh_key()
fi
}
+show_reserved_mem()
+{
+ local mem=3D$(cat /sys/kernel/kexec_crash_size)
+ local mem_mb=3D$(expr $mem / 1024 / 1024)
+
+ echo "Reserved "$mem_mb"MB memory for crash kernel"
+}
+
handle_mode_switch()
{
if [ "$DEFAULT_DUMP_MODE" == "fadump" ]; then
@@ -1246,8 +1254,11 @@ main ()
propagate)
propagate_ssh_key
;;
+ showmem)
+ show_reserved_mem
+ ;;
*)
- echo $"Usage: $0 {start|stop|status|restart|propagate}"
+ echo $"Usage: $0 {start|stop|status|restart|propagate|showmem}"
exit 1
esac
}
diff --git a/kdumpctl.8 b/kdumpctl.8
index b446b81..023562b 100644
--- a/kdumpctl.8
+++ b/kdumpctl.8
@@ -35,6 +35,9 @@ Is equal to
.I propagate
Helps to setup key authentication for ssh storage since it's
impossible to use password authentication during kdump.
+.TP
+.I showmem
+Prints the size of reserved memory for crash kernel in megabytes.
.SH "SEE ALSO"
.BR kdump.conf (5),
--
2.7.4