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diff --git a/Documentation/trace-cmd/trace-cmd-show.1.txt b/Documentation/trace-cmd/trace-cmd-show.1.txt new file mode 100644 index 00000000..ea2fda28 --- /dev/null +++ b/Documentation/trace-cmd/trace-cmd-show.1.txt @@ -0,0 +1,100 @@ +TRACE-CMD-SHOW(1) +================= + +NAME +---- +trace-cmd-show - show the contents of the Ftrace Linux kernel tracing buffer. + +SYNOPSIS +-------- +*trace-cmd show* ['OPTIONS'] + +DESCRIPTION +----------- +The trace-cmd(1) show displays the contents of one of the Ftrace Linux +kernel tracing files: trace, snapshot, or trace_pipe. It is basically +the equivalent of doing: + + cat /sys/kernel/debug/tracing/trace + +OPTIONS +------- +*-p*:: + Instead of displaying the contents of the "trace" file, use the + "trace_pipe" file. The difference between the two is that the "trace" + file is static. That is, if tracing is stopped, the "trace" file + will show the same contents each time. + + The "trace_pipe" file is a consuming read, where a read of the file + will consume the output of what was read and it will not read the + same thing a second time even if tracing is stopped. This file + als will block. If no data is available, trace-cmd show will stop + and wait for data to appear. + +*-s*:: + Instead of reading the "trace" file, read the snapshot file. The snapshot + is made by an application writing into it and the kernel will perform + as swap between the currently active buffer and the current snapshot + buffer. If no more swaps are made, the snapshot will remain static. + This is not a consuming read. + +*-c* 'cpu':: + Read only the trace file for a specified CPU. + +*-f*:: + Display the full path name of the file that is being displayed. + +*-B* 'buf':: + If a buffer instance was created, then the *-B* option will access the + files associated with the given buffer. + +*--tracing_on*:: + Show if tracing is on for the given instance. + +*--current_tracer*:: + Show what the current tracer is. + +*--buffer_size*:: + Show the current buffer size (per-cpu) + +*--buffer_total_size*:: + Show the total size of all buffers. + +*--ftrace_filter*:: + Show what function filters are set. + +*--ftrace_notrace*:: + Show what function disabled filters are set. + +*--ftrace_pid*:: + Show the PIDs the function tracer is limited to (if any). + +*--graph_function*:: + Show the functions that will be graphed. + +*--graph_notrace*:: + Show the functions that will not be graphed. + +*--cpumask*:: + Show the mask of CPUs that tracing will trace. + + +SEE ALSO +-------- +trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1), +trace-cmd-extract(1), trace-cmd-reset(1), trace-cmd-split(1), +trace-cmd-list(1), trace-cmd-listen(1) + +AUTHOR +------ +Written by Steven Rostedt, <rostedt@goodmis.org> + +RESOURCES +--------- +https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/ + +COPYING +------- +Copyright \(C) 2010 Red Hat, Inc. Free use of this software is granted under +the terms of the GNU Public License (GPL). + |