X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=doc%2Fman%2Flttng.1;h=f472d389d7bd9262d57dfacc109eab47d3f677ce;hb=c5db699c91964a0f2c73f75677504c531f9f376f;hp=33cc5630432826311cfdd906aeb871307b247493;hpb=23d14dff22683582847cde7ed416a5aeb90e3bd9;p=lttng-tools.git diff --git a/doc/man/lttng.1 b/doc/man/lttng.1 index 33cc56304..f472d389d 100644 --- a/doc/man/lttng.1 +++ b/doc/man/lttng.1 @@ -1,7 +1,7 @@ .TH "LTTNG" "1" "December 3rd, 2012" "" "" .SH "NAME" -lttng \(em LTTng 2.1.x tracer control command line tool +lttng \(em LTTng 2.x tracer control command line tool .SH "SYNOPSIS" @@ -297,7 +297,8 @@ If NAME is omitted, the session name is taken from the .lttngrc file. .nf Enable tracing channel -To enable event, you must first enable a channel which contains event(s). +To enable an event, you must enable both the event and the channel that +contains it. If \fB\-s, \-\-session\fP is omitted, the session name is taken from the .lttngrc file. @@ -326,17 +327,21 @@ same type. \-\-overwrite Flight recorder mode : overwrites events when subbuffers are full \-\-subbuf-size SIZE - Subbuffer size in bytes (default: 4096, kernel default: 262144) + Subbuffer size in bytes {+k,+M,+G} + (default UST uid: 131072, UST pid: 4096, kernel: 262144, metadata: 4096) + Rounded up to the next power of 2. \-\-num-subbuf NUM - Number of subbuffers (default: 4) - Needs to be a power of 2 for kernel and ust tracers + Number of subbuffers. (default UST uid: 4, UST pid: 4, kernel: 4, metadata: 2) + Rounded up to the next power of 2. \-\-switch-timer USEC - Switch subbuffer timer interval in usec (default: 0) - Needs to be a power of 2 for kernel and ust tracers + Switch subbuffer timer interval in µsec. + (default UST uid: 0, UST pid: 0, kernel: 0, metadata: 0) \-\-read-timer USEC - Read timer interval in usec (default: 200) + Read timer interval in µsec. + (default UST uid: 0, UST pid: 0, kernel: 200000, metadata: 0) \-\-output TYPE Channel output type. Possible values: mmap, splice + (default UST uid: mmap, UST pid: mmap, kernel: splice, metadata: mmap) \-\-buffers-uid Use per UID buffer (\-u only). Buffers are shared between applications that have the same UID. @@ -344,6 +349,30 @@ same type. Use per PID buffer (\-u only). Each application has its own buffers. \-\-buffers-global Use shared buffer for the whole system (\-k only) +\-C, \-\-tracefile-size SIZE + Maximum size of each tracefile within a stream (in bytes). + 0 means unlimited. (default: 0) +\-W, \-\-tracefile-count COUNT + Used in conjunction with \-C option, this will limit the number + of files created to the specified count. 0 means unlimited. (default: 0) + +.B EXAMPLES: + +$ lttng enable-channel -C 4096 -W 32 chan1 +For each stream, the maximum size of a trace file will be 4096 bytes divided +over a \fBmaximum\fP of 32 different files. The file count is appended after +the stream number as seen in the following example. The last trace file is +smaller than 4096 since it was not completely filled. + + ~/lttng-traces/[...]/chan1_0_0 (4096) + ~/lttng-traces/[...]/chan1_0_1 (4096) + ~/lttng-traces/[...]/chan1_0_2 (3245) + ~/lttng-traces/[...]/chan1_1_0 (4096) + ... + +$ lttng enable-channel -C 4096 +This will create trace files of 4096 bytes and will create new ones as long as +there is data available. .fi .IP @@ -407,12 +436,12 @@ file. \-\-filter 'expression' Set a filter on a newly enabled event. Filter expression on event - fields, event recording depends on evaluation. Only specify on first - activation of a given event within a session. Filter only allowed when - enabling events within a session before tracing is started. If the - filter fails to link with the event within the traced domain, the event - will be discarded. Currently, filter is only implemented for the - user-space tracer. + fields and context. Event recording depends on evaluation. Only + specify on first activation of a given event within a session. + Filter only allowed when enabling events within a session before + tracing is started. If the filter fails to link with the event + within the traced domain, the event will be discarded. + Currently, filter is only implemented for the user-space tracer. Expression examples: @@ -423,7 +452,19 @@ file. Wildcards are allowed at the end of strings: 'seqfield1 == "te*"' In string literals, the escape character is a '\\'. Use '\\*' for - the '*' character, and '\\\\' for the '\\' character. + the '*' character, and '\\\\' for the '\\' character. Wildcard + match any sequence of characters, including an empty sub-string + (match 0 or more characters). + + Context information can be used for filtering. The examples + below show usage of context filtering on process name (with a + wildcard), process ID range, and unique thread ID for filtering. + The process and thread ID of running applications can be found + under columns "PID" and "LWP" of the "ps -eLf" command. + + '$ctx.procname == "demo*"' + '$ctx.vpid >= 4433 && $ctx.vpid < 4455' + '$ctx.vtid == 1234' .fi .IP "\fBdisable-channel\fP NAME[,NAME2,...] [\-k|\-u] [OPTIONS]"