Add freebsd-tips fortune about sysctl kern.tty_info_kstacks
ClosedPublic
Actions

Authored by grembo on May 21 2021, 4:18 PM.

Details

Reviewers

imp
ceri

Group Reviewers

docs

Commits

rG278e37006673: freebsd-tips: Add fortune on kern.tty_info_kstacks

Summary

Following this discussion on -current,
https://lists.freebsd.org/archives/freebsd-current/2021-May/169405.html
add a little something to fortune.

Update: Mail archive link changed: https://lists.freebsd.org/archives/freebsd-current/2021-May/000021.html

Test Plan

$ cd usr.bin/fortune/datfiles
$ make
$ while true; do fortune freebsd-tips | grep -A4 stack && break; done

Diff Detail

Repository

rS FreeBSD src repository - subversion

Lint

Lint Passed

Unit

No Test Coverage

Build Status

Buildable 39342
Build 36231: arc lint + arc unit

Event Timeline

grembo requested review of this revision.May 21 2021, 4:18 PM

grembo created this revision.

Harbormaster completed remote builds in B39342: Diff 89617.May 21 2021, 4:18 PM

grembo changed the repository for this revision from rS FreeBSD src repository - subversion to rG FreeBSD src repository.May 21 2021, 4:18 PM

Adding docs, as this might be more appropriate(?)

That sysctl is 2 by default, at least on -CURRENT.
Do we care that this is wrong on CURRENT (I don't think I do) ?

grembo edited the summary of this revision. (Show Details)Jun 9 2021, 12:59 PM

grembo edited the summary of this revision. (Show Details)

In D30388#689933, @ceri wrote:

That sysctl is 2 by default, at least on -CURRENT.
Do we care that this is wrong on CURRENT (I don't think I do) ?

I think it's 1 by default on CURRENT at the moment (https://cgit.freebsd.org/src/commit/sys/kern/tty_info.c?id=e94fdc38331157d7d0bc888a14279f03639e09a2).

@ceri Alternative wording:

You can control kernel stack(9) traces on ^T (tty info) by setting
kern.tty_info_kstacks to 0 (off), 1 (on), or 2 (verbose), e.g.:

# sysctl kern.tty_info_kstacks=2

		-- Michael Gmelin <grembo@FreeBSD.org>
%

In D30388#689940, @grembo wrote:

@ceri Alternative wording:

You can control kernel stack(9) traces on ^T (tty info) by setting
kern.tty_info_kstacks to 0 (off), 1 (on), or 2 (verbose), e.g.:

        sysctl kern.tty_info_kstacks=2

		-- Michael Gmelin <grembo@FreeBSD.org>
%

Yeah, this is nicer and more futureproof, ta.

Cool, I like this.