kdump

Estimating kdump file size

makedumpfile -f --mem-usage /proc/kcore

The makedumpfile command reports in pages. This means that you must calculate the size of memory in use against the kernel page size, which in the Red Hat Enterprise Linux kernel, is 4 kilobytes for AMD64 and Intel 64 architectures, and 64 kilobytes for IBM POWER architecture.

References

• https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/7/html/kernel_administration_guide/kernel_crash_dump_guide#sect-estimating-kdump-usage