Date: Sat, 7 May 2022 15:34:36 GMT From: Warner Losh <imp@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 6910fee62e77 - main - dmesg: Document kern.msgbuf_show_timestamp Message-ID: <202205071534.247FYajo087900@gitrepo.freebsd.org>
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The branch main has been updated by imp: URL: https://cgit.FreeBSD.org/src/commit/?id=6910fee62e77afecbaff3be0ff922a34e85a9881 commit 6910fee62e77afecbaff3be0ff922a34e85a9881 Author: Warner Losh <imp@FreeBSD.org> AuthorDate: 2022-05-06 16:32:10 +0000 Commit: Warner Losh <imp@FreeBSD.org> CommitDate: 2022-05-07 15:32:21 +0000 dmesg: Document kern.msgbuf_show_timestamp kern.msgbuf_show_timestamp=1 turns on timestamps in kernel's message buffer which dmesg(8) prints. Sponsored by: Netflix --- sbin/dmesg/dmesg.8 | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/sbin/dmesg/dmesg.8 b/sbin/dmesg/dmesg.8 index e40d8d5c9ff7..13101baf7e78 100644 --- a/sbin/dmesg/dmesg.8 +++ b/sbin/dmesg/dmesg.8 @@ -28,7 +28,7 @@ .\" @(#)dmesg.8 8.1 (Berkeley) 6/5/93 .\" $FreeBSD$ .\" -.Dd October 3, 2016 +.Dd May 6, 2022 .Dt DMESG 8 .Os .Sh NAME @@ -70,6 +70,19 @@ is also specified, extract the name list from the specified system instead of the default, which is the kernel image the system has booted from. .El +.Sh SYSCTL VARIABLES +The following +.Xr sysctl 8 +variables can be used to control the behavior of the kernel's placing data into +the message buffer: +The default value is shown next to each variable. +.Bl -tag -width indent +.It kern.msgbuf_show_timestamp : No 0 +If set to 1, then a timestamp will be added to most lines in the message buffer. +This may also be set as a boot +.Xr loader 8 +tunable. +.El .Sh FILES .Bl -tag -width ".Pa /var/run/dmesg.boot" -compact .It Pa /var/run/dmesg.boot
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