Add modern method get boottime modern Linux kernel - #405
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The old method is left in case /proc/stat doesn't work, but modern kernel advises against using this hack as it causes an expensive fork() system interrupt. References: - https://www.linuxhowtos.org/System/procstat.htm - https://man7.org/linux/man-pages/man5/proc_stat.5.html
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The old method is left in case /proc/stat doesn't work, but modern kernel advises against using this hack as it causes an expensive
fork()system interrupt.The fork() call requires the kernel to create a complete copy of the process's address space (using the Copy-on-Write mechanism), allocate new data structures (PIDs, descriptors), initialize page tables, etc. This is a heavy operation that consumes CPU and memory resources.[1][2]
References: