RESIZE_ARRAY(9)

💅 RESIZE_ARRAY(9) — like, the Kernel API Manual page you actually wanna read

okay so picture this: you're deep in the Kernel API Manual, section 9, and you've got a BPF array that needs to grow. Bestie, this macro is your girl. Let's get into it ✨

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🦋 NAME

RESIZE_ARRAY — the convenience macro for resizing a BPF array. That's it, that's the whole vibe. No cap.

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🎀 SYNOPSIS

RESIZE_ARRAY (__skel , elfsec , arr , n );

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✨ ARGUMENTS

• __skel — the skeleton that's holding your array. the whole container, the main character 🫶
• elfsec — the data section of the BPF program where the array lives. you gotta tell it where 👀
• arr — the name of the array. literally just the name, bestie 🎀
• n — the desired array element count. how many you want. the number. the goal. ⭐

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🔥 DESCRIPTION

Okay so for BPF arrays declared with RESIZABLE_ARRAY, this macro does two things, and honestly? both ate.

Operation one: it resizes the map that corresponds to the custom data section containing the target array. And as a little side effect — lowkey iconic — the BTF info for the array gets adjusted so that the array length is sized to cover the new data section size. slay 💅

Operation two: it reassigns the skeleton pointer for that custom data section so it points at the newly memory mapped region. boom. new region, new pointer, new you. ✨

ngl, that's the whole thing — two operations, done. no weird edge cases listed here, so don't go inventing any 🙈

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🌈 SEE ALSO

• the Kernel file ./tools/sched_ext/include/scx/common.h — go read it, iykyk 💜

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and that's the page!! 🦋 big kisses to ./tools/sched_ext/include/scx for the source, October 2026 for the date, and the Kernel API Manual for hosting. mwah 💖 periodt.