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Differential D49931

arch.7: Add a section describing the user address space
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Authored by markj on Apr 20 2025, 5:23 PM.
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imp
jhb
kib
emaste
ziaee
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rG58dd3aa31d17: arch.7: Add a section describing the user address space
Summary

Provide some details about the user address space on each platform.
Document platforms which support multiple address spaces. I didn't
include 32-bit ABIs here, but maybe I should.

Diff Detail

Repository
rG FreeBSD src repository
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Unit
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Build Status
Buildable 63601
Build 60485: arc lint + arc unit

Event Timeline

markj created this revision.Apr 20 2025, 5:23 PM
Herald added a subscriber: ziaee. · View Herald TranscriptApr 20 2025, 5:23 PM
markj requested review of this revision.Apr 20 2025, 5:23 PM
Harbormaster completed remote builds in B63601: Diff 153967.Apr 20 2025, 5:23 PM
ziaee added a comment.Apr 20 2025, 6:02 PM

I love this!

share/man/man7/arch.7
231

The width fields should contain the first longest rendered item in the column.

markj updated this revision to Diff 153974.Apr 20 2025, 6:32 PM

Fix column widths.

Mention that the KERN_PROC_VM_LAYOUT sysctl can be used to get more info about
a particular process.

Harbormaster completed remote builds in B63603: Diff 153974.Apr 20 2025, 6:32 PM
kib added inline comments.Apr 20 2025, 6:36 PM
share/man/man7/arch.7
255

This text would need an editing after D49913

266

Why is this sentence put under riscv paragraph? It is a generic statement.

markj updated this revision to Diff 153977.Apr 20 2025, 6:46 PM
markj marked 2 inline comments as done.

Re-order paragraphs.

Harbormaster completed remote builds in B63606: Diff 153977.Apr 20 2025, 6:46 PM
markj added inline comments.Apr 20 2025, 6:46 PM
share/man/man7/arch.7
255

Yes, I will keep this diff open until that one lands.

jhb added inline comments.Apr 21 2025, 6:25 PM
share/man/man7/arch.7
246
markj updated this revision to Diff 154473.Apr 29 2025, 2:21 PM
markj marked an inline comment as done.

Document vm.pmap.prefer_uva_la48

Harbormaster completed remote builds in B63776: Diff 154473.Apr 29 2025, 2:21 PM
kib added inline comments.Apr 29 2025, 3:26 PM
share/man/man7/arch.7
248

I believe this should be

.Xr sysctl 3
252
258

tunable can be used to force system into the 4-level paging mode, even if hardware supports 5-level paging. In particular, all processes would get 48bit AS.

268

Also proccontrol -m la48/la57 should be mentioned and cross-linked.

emaste added inline comments.Apr 29 2025, 3:34 PM
share/man/man7/arch.7
233

Should we use e.g. 256 TiB?

ziaee added inline comments.Apr 29 2025, 3:44 PM
share/man/man7/arch.7
233

+1 for precise, internationally standardized units.

markj updated this revision to Diff 154543.Apr 30 2025, 1:26 PM
markj marked 7 inline comments as done.

Apply reviewer feedback.

Harbormaster completed remote builds in B63798: Diff 154543.Apr 30 2025, 1:26 PM
kib accepted this revision.Apr 30 2025, 1:28 PM
This revision is now accepted and ready to land.Apr 30 2025, 1:28 PM
emaste accepted this revision.Apr 30 2025, 1:34 PM
ziaee accepted this revision.Apr 30 2025, 3:08 PM
Closed by commit rG58dd3aa31d17: arch.7: Add a section describing the user address space (authored by markj). · Explain WhyMay 1 2025, 2:23 PM
This revision was automatically updated to reflect the committed changes.
markj added a commit: rG58dd3aa31d17: arch.7: Add a section describing the user address space.

Revision Contents
Changeset List

PathSize
share/
man/
man7/
38 lines

Diff 153967

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share/man/man7/arch.7

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