PMAP_OBJECT_INIT_PT(9)

💖 PMAP_OBJECT_INIT_PT 💖

okay bestie, so this one's from the Kernel Developer's Manual — it's pmap_object_init_pt(9) and it's literally the girl who pre-games your page tables so nobody has to panic later 🎀

✨ NAME ✨

pmap_object_init_pt — initialize page tables for a VM object

🌸 SYNOPSIS 🌸

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

void
pmap_object_init_pt(pmap_t pmap, vm_offset_t addr, vm_object_t object,
    vm_pindex_t pindex, vm_size_t size, int limit);

💅 DESCRIPTION 💅

so pmap_object_init_pt() preloads the page table entries into the physical map you picked, pmap 👑 — for the object you handed it, sitting at virtual address addr, for size bytes, starting at page index pindex inside the object. and the map bits limit? yeah she heeds them when she's making the mapping. no skipping that, periodt 💖

🦋 IMPLEMENTATION NOTES 🦋

ngl, this function is not strictly required by an architecture's pmap(9) implementation — but if you do implement it, you get performance benefits, and that's the whole vibe 🫶

it exists to eliminate the blast of soft faults on process startup, and right after a call to mmap(2). like, imagine all those faults hitting at once — not cute. this is the glow-up that stops it ✨

🌈 SEE ALSO 🌈

• pmap(9)
• vm_map(9)

🎀 AUTHORS 🎀

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

and that's the whole page, bestie! this one came from Debian, dated July 21, 2003, and it lives under the name PMAP_OBJECT_INIT_PT(9) — iconic behavior from 2003 fr fr 👑💖