There is requirement to decide the recommended memory size for the current
system. Ant the algorithm is based on /proc/iomem, so it can align with the
algorithm used by reserve_crashkernel() in kernel.
Signed-off-by: Pingfan Liu <piliu(a)redhat.com>
---
kdump-lib.sh | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 69 insertions(+)
diff --git a/kdump-lib.sh b/kdump-lib.sh
index d2801da..a4bab39 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -823,3 +823,72 @@ prepare_cmdline()
echo ${cmdline}
}
+
+#get system memory size in the unit of GB
+get_system_size()
+{
+ result=$(cat /proc/iomem | grep "System RAM" | awk -F ":" '{
print $1 }' | tr [:lower:] [:upper:] | paste -sd+)
+ result="+$result"
+ # replace '-' with '+0x' and '+' with '-0x'
+ sum=$( echo $result | sed -e 's/-/K0x/g' | sed -e 's/+/-0x/g' | sed -e
's/K/+/g' )
+ size=$(printf "%d\n" $(($sum)))
+ let size=$size/1024/1024/1024
+
+ echo $size
+}
+
+get_recommend_size()
+{
+ local mem_size=$1
+ local _ck_cmdline=$2
+ local OLDIFS="$IFS"
+
+ last_sz=""
+ last_unit=""
+
+ IFS=','
+ for i in $_ck_cmdline
+ do
+ end=$(echo $i | awk -F "-" '{ print $2 }' | awk -F ":"
'{ print $1 }')
+ recommend=$(echo $i | awk -F "-" '{ print $2 }' | awk -F
":" '{ print $2 }')
+ size=${end: : -1}
+ unit=${end: -1}
+ if [ $unit == 'T' ]; then
+ let size=$size*1024
+ fi
+ if [ $mem_size -lt $size ]; then
+ echo $recommend
+ IFS="$OLDIFS"
+ return
+ fi
+ done
+ IFS="$OLDIFS"
+}
+
+# return recommended size based on current system RAM size
+kdump_get_arch_recommend_size()
+{
+ if ! [[ -r "/proc/iomem" ]] ; then
+ echo "Error, can not access /proc/iomem."
+ return 1
+ fi
+ arch=$(lscpu | grep Architecture | awk -F ":" '{ print $2 }' | tr
[:lower:] [:upper:])
+
+ if [ $arch == "X86_64" ] || [ $arch == "S390" ]; then
+ ck_cmdline="1G-4G:160M,4G-64G:192M,64G-1T:256M,1T-:512M"
+ elif [ $arch == "ARM64" ]; then
+ ck_cmdline="2G-:448M"
+ elif [ $arch == "PPC64LE" ]; then
+ if is_fadump_capable; then
+
ck_cmdline="4G-16G:768M,16G-64G:1G,64G-128G:2G,128G-1T:4G,1T-2T:6G,2T-4T:12G,4T-8T:20G,8T-16T:36G,16T-32T:64G,32T-64T:128G,64T-:180G"
+ else
+
ck_cmdline="2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G"
+ fi
+ fi
+
+ ck_cmdline=$( echo $ck_cmdline | sed -e 's/-:/-102400T:/g' )
+ sys_mem=$(get_system_size)
+ result=$( get_recommend_size $sys_mem "$ck_cmdline" )
+ echo $result
+ return 0
+}
--
2.29.2
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