[Verse 1] Deep inside the kernel's core, three pillars stand so strong Filesystem, network stack, and memory all along Configure each subsystem right, your system comes alive Virtual file system layer makes all storage types thrive [Chorus] F-S for files, N-E-T for packets flying M-E-M for pages, kernel's never lying Core subsystems working hand in hand Configure them well and you'll understand Essential kernel, essential kernel Making systems grand [Verse 2] Mount points bridge the user space to storage down below Inode operations tell the kernel where to go Buffer cache speeds up access, page cache holds the keys Journaling keeps data safe when system guarantees [Chorus] F-S for files, N-E-T for packets flying M-E-M for pages, kernel's never lying Core subsystems working hand in hand Configure them well and you'll understand Essential kernel, essential kernel Making systems grand [Verse 3] Network stack in layers built, from physical to app Socket buffers queue the data, protocol handlers map Routing tables guide the flow, netfilter guards the gate Interrupt handling keeps it smooth, no packets come too late [Bridge] Memory zones divide the RAM DMA, normal, high demand Buddy allocator finds the space Slab cache puts objects in their place Page replacement algorithms decide Which memory stays, which gets pushed aside [Chorus] F-S for files, N-E-T for packets flying M-E-M for pages, kernel's never lying Core subsystems working hand in hand Configure them well and you'll understand Essential kernel, essential kernel Making systems grand [Outro] Three subsystems, one kernel heart Configure them right from the start Essential knowledge for the engineer Full stack mastery crystal clear
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