'\" t
.\"     Title: lttng-enable-channel
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 14 June 2021
.\"    Manual: LTTng Manual
.\"    Source: LTTng 2.13.11
.\"  Language: English
.\"
.TH "LTTNG\-ENABLE\-CHANN" "1" "14 June 2021" "LTTng 2\&.13\&.11" "LTTng Manual"
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.nh
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.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
lttng-enable-channel \- Create or enable LTTng channels
.SH "SYNOPSIS"
.sp
Create a Linux kernel channel:
.sp
.nf
\fBlttng\fR [\fIGENERAL OPTIONS\fR] \fBenable\-channel\fR \fB--kernel\fR
      [\fB--discard\fR | \fB--overwrite\fR] [\fB--output\fR=(\fBmmap\fR | \fBsplice\fR)]
      [\fB--subbuf-size\fR=\fISIZE\fR] [\fB--num-subbuf\fR=\fICOUNT\fR]
      [\fB--switch-timer\fR=\fIPERIODUS\fR] [\fB--read-timer\fR=\fIPERIODUS\fR]
      [\fB--monitor-timer\fR=\fIPERIODUS\fR] [\fB--buffers-global\fR]
      [\fB--tracefile-size\fR=\fISIZE\fR [\fB--tracefile-count\fR=\fICOUNT\fR]]
      [\fB--session\fR=\fISESSION\fR] \fICHANNEL\fR
.fi
.sp
Create a user space channel:
.sp
.nf
\fBlttng\fR [\fIGENERAL OPTIONS\fR] \fBenable\-channel\fR \fB--userspace\fR
      [\fB--overwrite\fR | [\fB--discard\fR] \fB--blocking-timeout\fR=\fITIMEOUTUS\fR]
      [\fB--output\fR=\fBmmap\fR] [\fB--buffers-uid\fR | \fB--buffers-pid\fR]
      [\fB--subbuf-size\fR=\fISIZE\fR] [\fB--num-subbuf\fR=\fICOUNT\fR]
      [\fB--switch-timer\fR=\fIPERIODUS\fR] [\fB--read-timer\fR=\fIPERIODUS\fR]
      [\fB--monitor-timer\fR=\fIPERIODUS\fR]
      [\fB--tracefile-size\fR=\fISIZE\fR [\fB--tracefile-count\fR=\fICOUNT\fR]]
      [\fB--session\fR=\fISESSION\fR] \fICHANNEL\fR
.fi
.sp
Enable channel(s):
.sp
.nf
\fBlttng\fR [\fIGENERAL OPTIONS\fR] \fBenable\-channel\fR (\fB--userspace\fR | \fB--kernel\fR)
      [\fB--session\fR=\fISESSION\fR] \fICHANNEL\fR[,\fICHANNEL\fR]\&...
.fi
.SH "DESCRIPTION"
.sp
The \fBlttng enable-channel\fR command does one of:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Create a channel named
\fICHANNEL\fR\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Enable one or more disabled channels named
\fICHANNEL\fR
(non\-option argument, comma\-separated)\&.
.RE
.sp
See \fBlttng-concepts\fR(7) to learn more about channels\&.
.sp
The channel(s) to create or enable belong to:
.PP
With the \fB--session\fR=\fISESSION\fR option
.RS 4
The recording session named
\fISESSION\fR\&.
.RE
.PP
Without the \fB--session\fR option
.RS 4
The current recording session (see
\fBlttng-concepts\fR(7)
to learn more about the current recording session)\&.
.RE
.if n \{\
.sp
.\}
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.RS 4
.sp
The \fBlttng-enable-event\fR(1) command can automatically create a default channel when no channel exists for the provided tracing domain\&.
.sp .5v
.RE
.sp
See the \(lqEXAMPLES\(rq section below for usage examples\&.
.sp
List the channels of a given recording session with the \fBlttng-list\fR(1) and \fBlttng-status\fR(1) commands\&.
.sp
Disable an enabled channel with the \fBlttng-disable-channel\fR(1) command\&.
.if n \{\
.sp
.\}
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBImportant\fR
.ps -1
.br
.RS 4
.sp
As of LTTng\ \&2\&.13\&.11, you may NOT perform the following operations with the \fBenable-channel\fR command:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Change an attribute of an existing channel\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Enable a disabled channel once its recording session has been active (started; see
\fBlttng-start\fR(1)) at least once\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Create a channel once its recording session has been active at least once\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Create a user space channel with a given buffering scheme (\fB--buffers-uid\fR
or
\fB--buffers-pid\fR
options) and create a second user space channel with a different buffering scheme in the same recording session\&.
.RE
.sp .5v
.RE
.SH "OPTIONS"
.sp
See \fBlttng\fR(1) for \fIGENERAL OPTIONS\fR\&.
.SS "Tracing domain"
.sp
One of:
.PP
\fB-k\fR, \fB--kernel\fR
.RS 4
Create or enable channels in the Linux kernel domain\&.
.RE
.PP
\fB-u\fR, \fB--userspace\fR
.RS 4
Create or enable channels in the user space domain\&.
.RE
.SS "Recording target"
.PP
\fB-s\fR \fISESSION\fR, \fB--session\fR=\fISESSION\fR
.RS 4
Create or enable channels in the recording session named
\fISESSION\fR
instead of the current recording session\&.
.RE
.SS "Buffering scheme"
.sp
One of:
.PP
\fB--buffers-global\fR
.RS 4
Allocate a single set of ring buffers for the whole system\&.
.sp
Only available with the
\fB--kernel\fR
option\&.
.sp
As of LTTng\ \&2\&.13\&.11, this is the default buffering scheme for the Linux kernel tracing domain, but this may change in the future\&.
.RE
.PP
\fB--buffers-pid\fR
.RS 4
Allocate one set of ring buffers (one per CPU) for each instrumented process of:
.PP
If you connect to the root session daemon
.RS 4
All Unix users\&.
.sp
See the \(lqSession daemon connection\(rq section of
\fBlttng\fR(1)
to learn how a user application connects to a session daemon\&.
.RE
.PP
Otherwise
.RS 4
Your Unix user\&.
.RE
.sp
Only available with the
\fB--userspace\fR
option\&.
.RE
.PP
\fB--buffers-uid\fR
.RS 4
Allocate one set of ring buffers (one per CPU) shared by all the instrumented processes of:
.PP
If you connect to the root session daemon
.RS 4
Each Unix user\&.
.sp
See the \(lqSession daemon connection\(rq section of
\fBlttng\fR(1)
to learn how a user application connects to a session daemon\&.
.RE
.PP
Otherwise
.RS 4
Your Unix user\&.
.RE
.sp
Only available with the
\fB--userspace\fR
option\&.
.sp
As of LTTng\ \&2\&.13\&.11, this is the default buffering scheme for the user space tracing domain, but this may change in the future\&.
.RE
.SS "Event record loss mode"
.PP
\fB--blocking-timeout\fR=\fITIMEOUTUS\fR
.RS 4
Set the channel\(cqs blocking timeout value to
\fITIMEOUTUS\fR\ \&\(mcs for instrumented applications executed with a set
\fBLTTNG_UST_ALLOW_BLOCKING\fR
environment variable\&.
.sp
\fITIMEOUTUS\fR
is one of:
.PP
\fB0\fR (default)
.RS 4
Do not block (non\-blocking mode)\&.
.RE
.PP
\fBinf\fR
.RS 4
Block forever until a sub\-buffer is available to write the event record\&.
.RE
.PP
\fIN\fR, a positive value
.RS 4
Wait for at most
\fIN\fR\ \&\(mcs when trying to write to a sub\-buffer\&. After
\fIN\fR\ \&\(mcs, discard the event record\&.
.RE
.sp
This option is only available with both the
\fB--userspace\fR
and
\fB--discard\fR
options\&.
.RE
.sp
One of:
.PP
\fB--discard\fR
.RS 4
Discard event records when there\(cqs no available sub\-buffer\&.
.sp
As of LTTng\ \&2\&.13\&.11, this is the default event record loss mode, but this may change in the future\&.
.RE
.PP
\fB--overwrite\fR
.RS 4
Overwrite the whole sub\-buffer containing the oldest event records when there\(cqs no available sub\-buffer (flight recorder mode)\&.
.RE
.SS "Sub\-buffers"
.PP
\fB--num-subbuf\fR=\fICOUNT\fR
.RS 4
Use
\fICOUNT\fR
sub\-buffers per ring buffer\&.
.sp
The effective value is
\fICOUNT\fR
rounded up to the next power of two\&.
.sp
Default values:
.PP
\fB--userspace\fR and \fB--buffers-uid\fR options
.RS 4
\fB4\fR
.RE
.PP
\fB--userspace\fR and \fB--buffers-pid\fR options
.RS 4
\fB4\fR
.RE
.PP
\fB--kernel\fR and \fB--buffers-global\fR options
.RS 4
\fB4\fR
.RE
.PP
\fBmetadata\fR channel
.RS 4
\fB2\fR
.RE
.RE
.PP
\fB--output\fR=\fITYPE\fR
.RS 4
Set channel\(cqs output type to
\fITYPE\fR\&.
.sp
\fITYPE\fR
is one of:
.PP
\fBmmap\fR
.RS 4
Share ring buffers between the tracer and the consumer daemon with the
\fBmmap\fR(2)
system call\&.
.RE
.PP
\fBsplice\fR
.RS 4
Share ring buffers between the tracer and the consumer daemon with the
\fBsplice\fR(2)
system call\&.
.sp
Only available with the
\fB--kernel\fR
option\&.
.RE
.sp
Default values:
.PP
\fB--userspace\fR and \fB--buffers-uid\fR options
.RS 4
\fBmmap\fR
.RE
.PP
\fB--userspace\fR and \fB--buffers-pid\fR options
.RS 4
\fBmmap\fR
.RE
.PP
\fB--kernel\fR and \fB--buffers-global\fR options
.RS 4
\fBsplice\fR
.RE
.PP
\fBmetadata\fR channel
.RS 4
\fBmmap\fR
.RE
.RE
.PP
\fB--subbuf-size\fR=\fISIZE\fR
.RS 4
Set the size of each sub\-buffer to
\fISIZE\fR
bytes\&.
.sp
The effective value is
\fISIZE\fR
rounded up to the next power of two\&.
.sp
The
\fBk\fR\ \&(KiB),
\fBM\fR\ \&(MiB), and
\fBG\fR\ \&(GiB) suffixes are supported\&.
.sp
The minimum sub\-buffer size, for each tracer, is the maximum value between the default below and the system page size (see
\fBgetconf\fR(1)
with the
\fBPAGE_SIZE\fR
variable)\&.
.sp
Default values:
.PP
\fB--userspace\fR and \fB--buffers-uid\fR options
.RS 4
\fB524288\fR
.RE
.PP
\fB--userspace\fR and \fB--buffers-pid\fR options
.RS 4
\fB16384\fR
.RE
.PP
\fB--kernel\fR and \fB--buffers-global\fR options
.RS 4
\fB1048576\fR
.RE
.PP
\fBmetadata\fR channel
.RS 4
\fB4096\fR
.RE
.RE
.SS "Trace files"
.PP
\fB--tracefile-count\fR=\fICOUNT\fR
.RS 4
Limit the number of trace files which LTTng writes for this channel to
\fICOUNT\fR\&.
.sp
\fICOUNT\fR
set to
\fB0\fR
means \(lqunlimited\(rq\&.
.sp
Default:
\fB0\fR\&.
.sp
You must also use the
\fB--tracefile-size\fR
option with this option\&.
.RE
.PP
\fB--tracefile-size\fR=\fISIZE\fR
.RS 4
Set the maximum size of each trace file which LTTng writes for this channel to
\fISIZE\fR\ \&bytes\&.
.sp
\fISIZE\fR
set to
\fB0\fR
means \(lqunlimited\(rq\&.
.sp
Default:
\fB0\fR\&.
.if n \{\
.sp
.\}
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.RS 4
Data streams which LTTng writes for a channel configured with this option may inaccurately report discarded event records as of CTF\ \&1\&.8\&.
.sp .5v
.RE
.RE
.SS "Timers"
.PP
\fB--monitor-timer\fR=\fIPERIODUS\fR
.RS 4
Set the period of the monitor timer of the channel to
\fIPERIODUS\fR\ \&\(mcs\&.
.sp
Set
\fIPERIODUS\fR
to
\fB0\fR
to disable the monitor timer\&.
.sp
Default values:
.PP
\fB--userspace\fR and \fB--buffers-uid\fR options
.RS 4
\fB1000000\fR
.RE
.PP
\fB--userspace\fR and \fB--buffers-pid\fR options
.RS 4
\fB1000000\fR
.RE
.PP
\fB--kernel\fR and \fB--buffers-global\fR options
.RS 4
\fB1000000\fR
.RE
.RE
.PP
\fB--read-timer\fR=\fIPERIODUS\fR
.RS 4
Set the period of the read timer of the channel to
\fIPERIODUS\fR\ \&\(mcs\&.
.sp
Set
\fIPERIODUS\fR
to
\fB0\fR
to disable the read timer\&.
.sp
Default values:
.PP
\fB--userspace\fR and \fB--buffers-uid\fR options
.RS 4
\fB0\fR
.RE
.PP
\fB--userspace\fR and \fB--buffers-pid\fR options
.RS 4
\fB0\fR
.RE
.PP
\fB--kernel\fR and \fB--buffers-global\fR options
.RS 4
\fB200000\fR
.RE
.PP
\fBmetadata\fR channel
.RS 4
\fB0\fR
.RE
.RE
.PP
\fB--switch-timer\fR=\fIPERIODUS\fR
.RS 4
Set the period of the switch timer of the channel to
\fIPERIODUS\fR\ \&\(mcs\&.
.sp
Set
\fIPERIODUS\fR
to
\fB0\fR
to disable the switch timer\&.
.sp
Default values:
.PP
\fB--userspace\fR and \fB--buffers-uid\fR options
.RS 4
\fB0\fR
.RE
.PP
\fB--userspace\fR and \fB--buffers-pid\fR options
.RS 4
\fB0\fR
.RE
.PP
\fB--kernel\fR and \fB--buffers-global\fR options
.RS 4
\fB0\fR
.RE
.PP
\fBmetadata\fR channel
.RS 4
\fB0\fR
.RE
.RE
.SS "Program information"
.PP
\fB-h\fR, \fB--help\fR
.RS 4
Show help\&.
.sp
This option attempts to launch
\fB/usr/bin/man\fR
to view this manual page\&. Override the manual pager path with the
\fBLTTNG_MAN_BIN_PATH\fR
environment variable\&.
.RE
.PP
\fB--list-options\fR
.RS 4
List available command options and quit\&.
.RE
.SH "EXIT STATUS"
.PP
\fB0\fR
.RS 4
Success
.RE
.PP
\fB1\fR
.RS 4
Command error
.RE
.PP
\fB2\fR
.RS 4
Undefined command
.RE
.PP
\fB3\fR
.RS 4
Fatal error
.RE
.PP
\fB4\fR
.RS 4
Command warning (something went wrong during the command)
.RE
.SH "ENVIRONMENT"
.PP
\fBLTTNG_ABORT_ON_ERROR\fR
.RS 4
Set to
\fB1\fR
to abort the process after the first error is encountered\&.
.RE
.PP
\fBLTTNG_HOME\fR
.RS 4
Path to the LTTng home directory\&.
.sp
Defaults to
\fB$HOME\fR\&.
.sp
Useful when the Unix user running the commands has a non\-writable home directory\&.
.RE
.PP
\fBLTTNG_MAN_BIN_PATH\fR
.RS 4
Absolute path to the manual pager to use to read the LTTng command\-line help (with
\fBlttng-help\fR(1)
or with the
\fB--help\fR
option) instead of
\fB/usr/bin/man\fR\&.
.RE
.PP
\fBLTTNG_SESSION_CONFIG_XSD_PATH\fR
.RS 4
Path to the directory containing the
\fBsession.xsd\fR
recording session configuration XML schema\&.
.RE
.PP
\fBLTTNG_SESSIOND_PATH\fR
.RS 4
Absolute path to the LTTng session daemon binary (see
\fBlttng-sessiond\fR(8)) to spawn from the
\fBlttng-create\fR(1)
command\&.
.sp
The
\fB--sessiond-path\fR
general option overrides this environment variable\&.
.RE
.SH "FILES"
.PP
\fB$LTTNG_HOME/.lttngrc\fR
.RS 4
Unix user\(cqs LTTng runtime configuration\&.
.sp
This is where LTTng stores the name of the Unix user\(cqs current recording session between executions of
\fBlttng\fR(1)\&.
\fBlttng-create\fR(1)
and
\fBlttng-set-session\fR(1)
set the current recording session\&.
.RE
.PP
\fB$LTTNG_HOME/lttng-traces\fR
.RS 4
Default output directory of LTTng traces in local and snapshot modes\&.
.sp
Override this path with the
\fB--output\fR
option of the
\fBlttng-create\fR(1)
command\&.
.RE
.PP
\fB$LTTNG_HOME/.lttng\fR
.RS 4
Unix user\(cqs LTTng runtime and configuration directory\&.
.RE
.PP
\fB$LTTNG_HOME/.lttng/sessions\fR
.RS 4
Default directory containing the Unix user\(cqs saved recording session configurations (see
\fBlttng-save\fR(1)
and
\fBlttng-load\fR(1))\&.
.RE
.PP
\fB/etc/lttng/sessions\fR
.RS 4
Directory containing the system\-wide saved recording session configurations (see
\fBlttng-save\fR(1)
and
\fBlttng-load\fR(1))\&.
.RE
.if n \{\
.sp
.\}
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.RS 4
.sp
\fB$LTTNG_HOME\fR defaults to the value of the \fBHOME\fR environment variable\&.
.sp .5v
.RE
.SH "EXAMPLES"
.PP
\fBExample\ \&1.\ \&Create a Linux kernel channel with default attributes in the current recording session\&.\fR
.RS 4
.sp
The following command line only creates a new channel if \fBmy-channel\fR doesn\(cqt name an existing Linux kernel channel in the current recording session\&.
.sp
.if n \{\
.RS 4
.\}
.nf
$ lttng enable\-channel \-\-kernel my\-channel
.fi
.if n \{\
.RE
.\}
.RE
.PP
\fBExample\ \&2.\ \&Create a user space channel with a per\-process buffering scheme in a specific recording session\&.\fR
.RS 4
.sp
See the \fB--session\fR and \fB--buffers-pid\fR options\&.
.sp
.if n \{\
.RS 4
.\}
.nf
$ lttng enable\-channel \-\-session=my\-session \-\-userspace \e
                       \-\-buffers\-pid my\-channel
.fi
.if n \{\
.RE
.\}
.RE
.PP
\fBExample\ \&3.\ \&Create a Linux kernel channel in the current recording session with four 32\-MiB sub\-buffers per ring buffer\&.\fR
.RS 4
.sp
See the \fB--num-subbuf\fR and \fB--subbuf-size\fR options\&.
.sp
.if n \{\
.RS 4
.\}
.nf
$ lttng enable\-channel \-\-kernel my\-channel \e
                       \-\-num\-subbuf=4 \-\-subbuf\-size=32M
.fi
.if n \{\
.RE
.\}
.RE
.PP
\fBExample\ \&4.\ \&Create a user space channel in the current recording session with trace file rotation\&.\fR
.RS 4
.sp
See the \fB--tracefile-count\fR and \fB--tracefile-size\fR options\&.
.sp
.if n \{\
.RS 4
.\}
.nf
$ lttng enable\-channel \-\-userspace my\-channel \e
                       \-\-tracefile\-count=16 \-\-tracefile\-size=8M
.fi
.if n \{\
.RE
.\}
.RE
.PP
\fBExample\ \&5.\ \&Enable two user space channels of a specific recording session\&.\fR
.RS 4
.sp
.if n \{\
.RS 4
.\}
.nf
$ lttng enable\-channel \-\-session=my\-session \-\-userspace \e
                       canal\-d,rds
.fi
.if n \{\
.RE
.\}
.RE
.SH "RESOURCES"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
LTTng project website <https://lttng.org>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
LTTng documentation <https://lttng.org/docs>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
LTTng bug tracker <https://bugs.lttng.org>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Git repositories <https://git.lttng.org>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
GitHub organization <https://github.com/lttng>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Continuous integration <https://ci.lttng.org/>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Mailing list <https://lists.lttng.org/>
for support and development:
\fBlttng-dev@lists.lttng.org\fR
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
IRC channel <irc://irc.oftc.net/lttng>:
\fB#lttng\fR
on
\fBirc.oftc.net\fR
.RE
.SH "COPYRIGHT"
.sp
This program is part of the LTTng\-tools project\&.
.sp
LTTng\-tools is distributed under the GNU General Public License version\ \&2 <http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html>\&. See the \fBLICENSE\fR <https://github.com/lttng/lttng-tools/blob/master/LICENSE> file for details\&.
.SH "THANKS"
.sp
Special thanks to Michel Dagenais and the DORSAL laboratory <http://www.dorsal.polymtl.ca/> at \('Ecole Polytechnique de Montr\('eal for the LTTng journey\&.
.sp
Also thanks to the Ericsson teams working on tracing which helped us greatly with detailed bug reports and unusual test cases\&.
.SH "SEE ALSO"
.sp
\fBlttng\fR(1), \fBlttng-disable-channel\fR(1), \fBlttng-list\fR(1), \fBlttng-concepts\fR(7)