PROBE::VM.WRITE_SH(3stap)

💖 probe::vm.write_shared_copy — the other write_shared probe 💖

okay bestie, welcome to the SystemTap Tapset Reference — this page is PROBE::VM.WRITE_SH(3stap) and it's lowkey one of the most underrated little tapsets in the memory crew. let's get into it 🫶

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✨ NAME ✨

probe::vm.write_shared_copy — page copy for shared page write

like... it's literally the moment a shared page has to get copied before you can write to it. it's giving copy-on-write main character energy 👑

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🌸 SYNOPSIS 🌸

probe vm.write_shared_copy {}

no arguments, no fuss, just vibes and a probe point 💅

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🎀 VALUES 🎀

the tea this probe hands you when it fires:

• address — the address of the shared write. that's the spot. that's where the action is happening 📍
• zero — a boolean telling you whether it's a zero page, which means you can do a clear instead of a copy. frugal. efficient. we love to see it ✨
• name — name of the probe point. it's the label on the box, bestie 🏷️

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🦋 CONTEXT 🦋

the process attempting the write. yeah. that one. the one doing the writing. it's always the one you least expect 🙈

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💜 DESCRIPTION 💜

so here's the lore: this probe fires when a write to a shared page requires a page copy. and it is always preceded by a vm.write_shared — like, it never shows up alone, it's a package deal, they arrive together, one right after the other, fr fr 🧚

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🔥 SEE ALSO 🔥

• tapset::memory(3stap) — go read the memory tapset, it's iconic, no cap ⭐

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ngl if you're tracing shared-page writes, this probe is the one that tells you "okay we had to actually duplicate the page" — which is exactly the kind of thing you want to know when you're staring at a perf number wondering why it's so big 💀

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and that's the whole page!! tysm for reading, go trace something cool, i'm obsessed with you 💖

— with love, your friendly neighborhood tapset, from the SystemTap Tapset Reference, September 2026 🌈🎀