X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=doc%2Fman%2Flttng-clear.1.txt;h=a74bee0ed0cd52598be041ccb68d0691a1b10722;hb=ebbd679f2e8b43e48ac97d76a7fe13fc4f44e576;hp=8b63d6c0c54a8d4c11c0c187232fdac634e38881;hpb=73b818e72d64f3553bad06f63924d8118e9f859a;p=lttng-tools.git diff --git a/doc/man/lttng-clear.1.txt b/doc/man/lttng-clear.1.txt index 8b63d6c0c..a74bee0ed 100644 --- a/doc/man/lttng-clear.1.txt +++ b/doc/man/lttng-clear.1.txt @@ -1,58 +1,116 @@ lttng-clear(1) -=============== -:revdate: 6 November 2019 +============== +:revdate: 17 May 2021 NAME ---- -lttng-clear - Clear a tracing session +lttng-clear - Clear an LTTng tracing session SYNOPSIS -------- [verse] -*lttng* ['linkgenoptions:(GENERAL OPTIONS)'] *clear* [option:--all | 'SESSION'] +*lttng* ['linkgenoptions:(GENERAL OPTIONS)'] *clear* ['SESSION' | option:--all] DESCRIPTION ----------- -The `lttng clear` command clears one or more tracing sessions. +The `lttng clear` command clears one or more tracing sessions, that is, +it deletes the contents of their tracing buffers and of all their local +and streamed trace data. -If no options are specified, the current tracing session is cleared -(see man:lttng-create(1) for more information about the current -tracing session). +See man:lttng-concepts(7) to learn more about tracing sessions. -If 'SESSION' is specified, the existing tracing session named 'SESSION' -is cleared. +The `clear` command clears: -If the option:--all option is used, *all* the tracing sessions, as listed -in the output of `lttng list`, are cleared. +Without any option:: + The current tracing session. ++ +See man:lttng-concepts(7) to learn more about the current tracing +session. -Clearing a tracing session deletes the contents of the tracing buffers and -all local or streamed trace data. +With the 'SESSION' argument:: + The tracing session named 'SESSION'. -If a session is configured in snapshot mode, only the tracing buffers are cleared. +With the option:--all option:: + *All* the tracing sessions of the connected session daemon for your + Unix user, or for all users if your Unix user is `root`, as listed + in the output of `lttng list` (see man:lttng-list(1)). ++ +See the ``Session daemon connection'' section of man:lttng(1) to learn +how a user application connects to a session daemon. -If at least one rotation occurred, only the tracing buffers and the current -trace chunks are cleared. Previous trace chunks are not cleared. +If a tracing session is configured in snapshot mode (see the +nloption:--snapshot option of the man:lttng-create(1) command), the +`clear` command only clears the tracing buffers. -Note that a lttng-relayd daemon can be configured to disallow clear operations -using LTTNG_RELAYD_DISALLOW_CLEAR. Clear commands performed on a streaming -session utilizing such lttng-relayd daemon will fail. +For a given tracing session, if at least one rotation occurred (see +man:lttng-concepts(7)), the `clear` command only clears its tracing +buffers and its current trace chunk, :not: its archived trace chunks. -include::common-cmd-options-head.txt[] +NOTE: The nloption:--disallow-clear option and the +`LTTNG_RELAYD_DISALLOW_CLEAR` environment variable of +man:lttng-relayd(8) can disable remote clearing operations. If LTTng +sends tracing data over the network for the selected tracing session(s) +to an LTTng relay daemon configured as such, the `clear` command fails. +See the <> section below for usage examples. + +include::common-lttng-cmd-options-head.txt[] + + +Recording target +~~~~~~~~~~~~~~~~ option:-a, option:--all:: - Clear all tracing sessions. + Clear all the tracing sessions of your Unix user, or of all users if + your Unix user is `root`, as listed in the output of + man:lttng-list(1), instead of the current tracing session or the + tracing session named 'SESSION'. + + +include::common-lttng-cmd-help-options.txt[] + + +include::common-lttng-cmd-after-options.txt[] + + +[[examples]] +EXAMPLES +-------- +.Clear the current tracing session. +==== +[role="term"] +---- +$ lttng clear +---- +==== -include::common-cmd-help-options.txt[] +.Clear a specific tracing session. +==== +[role="term"] +---- +$ lttng clear my-session +---- +==== + +.Clear all tracing sessions. +==== +See the option:--all option. + +[role="term"] +---- +$ lttng clear --all +---- +==== -include::common-cmd-footer.txt[] +include::common-footer.txt[] SEE ALSO -------- -man:lttng-rotate(1), -man:lttng-set-session(1), -man:lttng(1) +man:lttng(1), +man:lttng-create(1), +man:lttng-concepts(7), +man:lttng-relayd(8)