PMAP_IS_MODIFIED(9)

💅 PMAP_IS_MODIFIED(9) 💅

okay so welcome to the Kernel Developer's Manual page for PMAP_IS_MODIFIED(9) — yes bestie, we're in kernel-dev territory, and it's giving very specific physical-page energy. 🦋

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✨ NAME ✨

pmap_is_modified, pmap_ts_modified — return information about physical pages

tiny heads-up: the NAME line says pmap_ts_modified, while the SYNOPSIS and DESCRIPTION use pmap_ts_referenced. Both are literally on the page, so both stay. iykyk 💅

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🌸 SYNOPSIS 🌸

#include <sys/param.h>
#include <vm/vm.h>
#include <vm/pmap.h>

bool
pmap_is_modified(vm_page_t m);

int
pmap_ts_referenced(vm_page_t m);

These includes and signatures are exact — no cap, no edits. ✨

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🎀 DESCRIPTION 🎀

okay so the pmap_is_modified() and pmap_ts_referenced() functions return information about physical pages. That's the whole assignment: physical-page info, served fresh. 💖

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🔥 RETURN VALUES 🔥

pmap_is_modified()

pmap_is_modified() returns the status of the “page modified” bit for the physical page m. That's it — the modified-bit vibe check for page m. 👑

pmap_ts_referenced()

pmap_ts_referenced() returns a count of reference bits for a page m, clearing those bits. Not every reference bit has to get cleared — that's allowed — but it is necessary that 0 only be returned when there are no remaining reference bits set on the page. So if you get 0, bestie, that means no reference bits are left set. Periodt. 💀

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🌈 SEE ALSO 🌈

• pmap(9)
• pmap_clear_modify(9)

go read these next, fr fr 🫶

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💜 AUTHORS 💜

This manual page was written by Bruce M Simpson <bms@spc.org>.

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mwah 💋 this page is from the Debian edition, dated July 17, 2014, and it's the PMAP_IS_MODIFIED(9) page — iconic, honestly. 🎀