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kdump-lib.sh: rounded up the total_mem to 128M in get_system_size

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Resolves: RHEL-83645
Upstream: kdump-utils

commit 18fc5b7e7b89ee3caba04ce18bf32036aa19da6e
Author: Lichen Liu <lichliu@redhat.com>
Date:   Fri Mar 7 12:22:05 2025 +0800

    kdump-lib.sh: rounded up the total_mem to 128M in get_system_size

    The kernel code to calculate reserving size rounded up the total_mem because
    usually the memblock usable mem size is smaller than the physical dimm memory
    size:
            total_mem = roundup(total_mem, SZ_128M);

    This patch is aimed to align with the kernel's behavior. A machine showing
    4000MB of total memory will be treated as having 4G instead of 3G memory.

    Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2306493

    Signed-off-by: Lichen Liu <lichliu@redhat.com>

Signed-off-by: Lichen Liu <lichliu@redhat.com>
This commit is contained in:
Lichen Liu 2025-04-14 10:36:15 +08:00 committed by Tao Liu
parent 3053d95923
commit 97ec3f19c1
1 changed files with 5 additions and 2 deletions
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7
kdump-lib.sh
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@ -949,8 +949,11 @@ PROC_IOMEM=/proc/iomem
#get system memory size i.e. memblock.memory.total_size in the unit of GB
get_system_size()
{
sum=$(sed -n "s/\s*\([0-9a-fA-F]\+\)-\([0-9a-fA-F]\+\) : System RAM$/+ 0x\2 - 0x\1 + 1/p" $PROC_IOMEM)
echo $(( (sum) / 1024 / 1024 / 1024))
local _mem_size_mb _sum
_sum=$(sed -n "s/\s*\([0-9a-fA-F]\+\)-\([0-9a-fA-F]\+\) : System RAM$/+ 0x\2 - 0x\1 + 1/p" $PROC_IOMEM)
_mem_size_mb=$(( (_sum) / 1024 / 1024 ))
# rounding up the total_size to 128M to align with kernel code kernel/crash_reserve.c
echo $(((_mem_size_mb + 127) / 128 * 128 / 1024 ))
}
# Return the recommended size for the reserved crashkernel memory