Date: Tue, 4 Nov 2025 11:12:53 GMT From: Mateusz Piotrowski <0mp@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 3ccb2d9513e6 - main - dtrace_callout_execute.4: Document the DTrace callout_execute provider Message-ID: <202511041112.5A4BCrew026647@gitrepo.freebsd.org>
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The branch main has been updated by 0mp: URL: https://cgit.FreeBSD.org/src/commit/?id=3ccb2d9513e6a2e046e635c186da68acf8f8498b commit 3ccb2d9513e6a2e046e635c186da68acf8f8498b Author: Mateusz Piotrowski <0mp@FreeBSD.org> AuthorDate: 2025-11-04 11:10:55 +0000 Commit: Mateusz Piotrowski <0mp@FreeBSD.org> CommitDate: 2025-11-04 11:10:55 +0000 dtrace_callout_execute.4: Document the DTrace callout_execute provider MFC after: 2 weeks Fixes: 91dd9aae1ab8 Add explicit static DTrace tracing to the callout mechanism Differential Revision: https://reviews.freebsd.org/D51397 --- cddl/contrib/opensolaris/cmd/dtrace/dtrace.1 | 3 +- share/man/man4/Makefile | 1 + share/man/man4/dtrace_callout_execute.4 | 68 ++++++++++++++++++++++++++++ share/man/man9/callout.9 | 4 +- 4 files changed, 74 insertions(+), 2 deletions(-) diff --git a/cddl/contrib/opensolaris/cmd/dtrace/dtrace.1 b/cddl/contrib/opensolaris/cmd/dtrace/dtrace.1 index f09cbe1ac27b..456a9e319987 100644 --- a/cddl/contrib/opensolaris/cmd/dtrace/dtrace.1 +++ b/cddl/contrib/opensolaris/cmd/dtrace/dtrace.1 @@ -20,7 +20,7 @@ .\" .\" $FreeBSD$ .\" -.Dd November 3, 2025 +.Dd November 4, 2025 .Dt DTRACE 1 .Os .Sh NAME @@ -1292,6 +1292,7 @@ in .Xr cpp 1 , .Xr dwatch 1 , .Xr dtrace_audit 4 , +.Xr dtrace_callout_execute 4 , .Xr dtrace_dtrace 4 , .Xr dtrace_fbt 4 , .Xr dtrace_io 4 , diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile index 95618227a010..34edf6ad455d 100644 --- a/share/man/man4/Makefile +++ b/share/man/man4/Makefile @@ -1005,6 +1005,7 @@ _ccd.4= ccd.4 .if ${MK_CDDL} != "no" _dtrace_provs= dtrace_audit.4 \ + dtrace_callout_execute.4 \ dtrace_dtrace.4 \ dtrace_fbt.4 \ dtrace_io.4 \ diff --git a/share/man/man4/dtrace_callout_execute.4 b/share/man/man4/dtrace_callout_execute.4 new file mode 100644 index 000000000000..1154ed066b97 --- /dev/null +++ b/share/man/man4/dtrace_callout_execute.4 @@ -0,0 +1,68 @@ +.\" +.\" Copyright (c) 2025 Mateusz Piotrowski <0mp@FreeBSD.org> +.\" +.\" SPDX-License-Identifier: BSD-2-Clause +.\" +.Dd November 4, 2025 +.Dt DTRACE_CALLOUT_EXECUTE 4 +.Os +.Sh NAME +.Nm dtrace_callout_execute +.Nd a DTrace provider for the callout API +.Sh SYNOPSIS +.Nm callout_execute Ns Cm :kernel::callout_start +.Nm callout_execute Ns Cm :kernel::callout_end +.Sh DESCRIPTION +The +.Nm callout_execute +provider allows for tracing the +.Xr callout 9 +mechanism. +.Pp +The +.Nm callout_execute Ns Cm :kernel::callout_start +probe fires just before a callout. +.Pp +The +.Nm callout_execute Ns Cm :kernel::callout_end +probe fires right after a callout. +.Pp +The only argument to the +.Nm callout_execute +probes, +.Fa args[0] , +is a callout handler +.Ft struct callout * +of the invoked callout. +.Sh EXAMPLES +.Ss Example 1: Graph of Callout Execution Time +The following +.Xr d 7 +script generates a distribution graph of +.Xr callout 9 +execution times: +.Bd -literal -offset 2n +callout_execute:::callout_start +{ + self->cstart = timestamp; +} + +callout_execute:::callout_end +{ + @length = quantize(timestamp - self->cstart); +} +.Ed +.Sh SEE ALSO +.Xr dtrace 1 , +.Xr tracing 7 , +.Xr callout 9 , +.Xr SDT 9 +.Sh AUTHORS +.An -nosplit +The +.Nm callout_execute +provider was written by +.An Robert N. M. Watson Aq Mt rwatson@FreeBSD.org . +.Pp +This manual page was written by +.An Mateusz Piotrowski Aq Mt 0mp@FreeBSD.org . diff --git a/share/man/man9/callout.9 b/share/man/man9/callout.9 index 0e59ef8ab2b1..637049ec1ef5 100644 --- a/share/man/man9/callout.9 +++ b/share/man/man9/callout.9 @@ -27,7 +27,7 @@ .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE .\" POSSIBILITY OF SUCH DAMAGE. .\" -.Dd January 22, 2024 +.Dd November 4, 2025 .Dt CALLOUT 9 .Os .Sh NAME @@ -789,6 +789,8 @@ and functions return a value of one if the callout was still pending when it was called, a zero if the callout could not be stopped and a negative one is it was either not running or has already completed. +.Sh SEE ALSO +.Xr dtrace_callout_execute 4 .Sh HISTORY .Fx initially used the long standinghelp
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