PMAP_IS_MODIFIED(9)

💖 PMAP_IS_MODIFIED 💖

okay bestie, welcome to PMAP_IS_MODIFIED(9), straight out of the Kernel Developer's Manual ✨ this one's short and sweet and it's literally just about asking the kernel questions about physical pages 🫶

🌸 NAME 🌸

pmap_is_modified, pmap_ts_modified — return information about physical pages

(yes, the NAME line really does say pmap_ts_modified while the rest of the page is out here living its life as pmap_ts_referenced — not me fact-checking the manpage, we just report what it says 💅)

✨ SYNOPSIS ✨

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

boolean_t
pmap_is_modified(vm_page_t m);

int
pmap_ts_referenced(vm_page_t m);

look at those includes, so tidy, so organized 🎀

🦋 DESCRIPTION 🦋

The pmap_is_modified() and pmap_ts_referenced() functions return information about physical pages. that's it. that's the whole description. short king energy 👑

💅 RETURN VALUES 💅

The pmap_is_modified() function returns the status of the “page modified” bit for the physical page m. so like… is it modified or not, bestie, the bit has answers 💖

The pmap_ts_referenced() function returns a count of reference bits for a page m, clearing those bits. and here's the important part, no cap: it is not necessary for every reference bit to be cleared, but it is necessary that 0 only be returned when there are no remaining reference bits set on the page. read that one twice, it's giving rules 🔥

🌈 SEE ALSO 🌈

• pmap(9)
• pmap_clear_modify(9)

go read those too, they're iconic 💜

👑 AUTHORS 👑

This manual page was written by Bruce M Simpson <bms@spc.org>. thank you king, we appreciate you 🫶

and that's the whole vibe, bestie 🎀 this beauty came from Debian, dated July 17, 2014 — yeah it's a 2014 baby and it still ate 💖✨ slay, periodt 🌸