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pmap_growkernel: Use VM_ALLOC_NOFREE when allocating pagetable pages
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Authored by bnovkov on Jul 17 2024, 3:50 PM.

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markj
alc
kib
andrew
manu
mhorne

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rGddc09a10eaa6: pmap_growkernel: Use VM_ALLOC_NOFREE when allocating pagetable pages

Summary

This patch modifies pmap_growkernel in all pmaps to use VM_ALLOC_NOFREE when allocating new pagetable pages.
This should help reduce longterm fragmentation as these pages are never released after they are allocated.

Test Plan

Tested with the regression suite for all architectures except powerpc.

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rG FreeBSD src repository

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Event Timeline

bnovkov created this revision.Jul 17 2024, 3:50 PM

Herald added a reviewer: andrew. · View Herald TranscriptJul 17 2024, 3:50 PM

Herald added a reviewer: andrew. · View Herald Transcript

Herald added a reviewer: manu. · View Herald Transcript

Herald added subscribers: riscv, jhibbits, emaste, imp. · View Herald Transcript

bnovkov requested review of this revision.Jul 17 2024, 3:50 PM

bnovkov added a parent revision: D45863: vm: Introduce reservation-aware NOFREE page allocation routine.Jul 17 2024, 3:55 PM

Nice. The flag acts as a meaningful annotation, regardless of any effects on fragmentation.

This revision is now accepted and ready to land.Jul 18 2024, 4:11 PM

alc accepted this revision.Jul 18 2024, 6:50 PM

kib accepted this revision.Jul 19 2024, 5:03 AM

markj accepted this revision.Jul 21 2024, 4:37 PM

Closed by ddc09a1.

emaste added a commit: rGddc09a10eaa6: pmap_growkernel: Use VM_ALLOC_NOFREE when allocating pagetable pages.Jul 30 2024, 4:39 PM

Revision Contents
Changeset List

Path

Size

sys/

amd64/

pmap.c

7 lines

arm/

pmap-v6.c

2 lines

arm64/

pmap.c

6 lines

i386/

pmap.c

4 lines

powerpc/

aim/

mmu_radix.c

6 lines

riscv/

pmap.c

6 lines

Diff 141047

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sys/amd64/amd64/pmap.c

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sys/arm/arm/pmap-v6.c

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sys/arm64/arm64/pmap.c

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sys/i386/i386/pmap.c

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sys/powerpc/aim/mmu_radix.c

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pmap_growkernel: Use VM_ALLOC_NOFREE when allocating pagetable pagesClosedPublicActions

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Revision ContentsChangeset List

Diff 141047

sys/amd64/amd64/pmap.c

sys/arm/arm/pmap-v6.c

sys/arm64/arm64/pmap.c

sys/i386/i386/pmap.c

sys/powerpc/aim/mmu_radix.c

sys/riscv/riscv/pmap.c

pmap_growkernel: Use VM_ALLOC_NOFREE when allocating pagetable pages
ClosedPublic
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Revision Contents
Changeset List