xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

fix dtracy man page

Browse source
This commit is contained in:
aiju 2018-12-08 17:24:23 +00:00
parent 6056a46c64
commit 722a1a3334
1 changed files with 3 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
sys/man/1/dtracy
View file

@ -10,7 +10,7 @@ dtracy \- dynamic tracing language
.SH DESCRIPTION .SH DESCRIPTION
.I Dtracy .I Dtracy
is a language for dynamic tracing of the kernel. is a language for dynamic tracing of the kernel.
Essentially, they allow the user to define small programs in kernel space that are triggered by certain events (known as probes) upon which they are executed. Essentially, it allows the user to define small programs in kernel space that are triggered by certain events (known as probes) upon which they are executed.
.PP .PP
.I Dtracy .I Dtracy
uses an uses an
@ -28,7 +28,7 @@ program is a series of statements of one of the following forms
Each probe consists of three parts separated by \fL:\fR. Each probe consists of three parts separated by \fL:\fR.
If a part is omitted (e.g. \fLqsys::entry\fR), it matches all probes that match the remaining parts. If a part is omitted (e.g. \fLqsys::entry\fR), it matches all probes that match the remaining parts.
.PP .PP
\fIPredicate\fR, if specified, is an expression that must evaluate to a non-zero values for the actions to be executed. \fIPredicate\fR, if specified, is an expression that must evaluate to a non-zero value for the actions to be executed.
.PP .PP
\fIActions\fR is a semicolon-separated list of statements of one of the following forms: \fIActions\fR is a semicolon-separated list of statements of one of the following forms:
.IP .IP
@ -83,7 +83,7 @@ prints its arguments using a format string with
syntax. syntax.
However, there is no need to specify the argument size, e.g. \fL%d\fR works for all integer types. However, there is no need to specify the argument size, e.g. \fL%d\fR works for all integer types.
.PP .PP
Statements of the form \fL@\fIname\fL[\fIindex\fL] = \fIaggregation-expr\fR collect statistics using a data structures referred to as an aggregation. Statements of the form \fL@\fIname\fL[\fIindex\fL] = \fIaggregation-expr\fR collect statistics using a data structure referred to as an aggregation.
Each time the statement is evaluated adds another datapoint to the aggregation, which will be printed in tabular form when Each time the statement is evaluated adds another datapoint to the aggregation, which will be printed in tabular form when
.I dtracy .I dtracy
finishes. finishes.