vm: Introduce {VM_ALLOC, PG}_NOFREE flags
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Authored by bnovkov on Jul 14 2024, 1:33 PM.

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Reviewers

alc
markj
kib

Commits

rG92b9138991dd: vm: Introduce VM_ALLOC_NOFREE and PG_NOFREE

Summary

This patch adds two additional vm_page flags to distinguish pages that never get released while the system is running (e.g. UMA_ZONE_NOFREE slabs).
It also serves as a basis for implementing reservation-aware segregation of such pages.

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rG FreeBSD src repository

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Event Timeline

bnovkov created this revision.Jul 14 2024, 1:33 PM

Herald added a subscriber: imp. · View Herald TranscriptJul 14 2024, 1:33 PM

bnovkov requested review of this revision.Jul 14 2024, 1:33 PM

bnovkov added a child revision: D45863: vm: Introduce reservation-aware NOFREE page allocation routine.Jul 14 2024, 1:42 PM

bnovkov added a parent revision: D45045: malloc(9): introduce M_NEVERFREED.

markj accepted this revision.Jul 21 2024, 4:48 PM

markj added inline comments.

sys/vm/vm_page.h
460	This is only used for assertions, right? I'd maybe mention that in the comment, just in case we ever run out of bits for these flags and want to try and reclaim some.

This revision is now accepted and ready to land.Jul 21 2024, 4:48 PM

alc accepted this revision.Jul 21 2024, 8:20 PM

alc added inline comments.