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    Subject[tip:tracing/core] tracing: Add documentation for trace commands mod, traceon/traceoff
    Commit-ID:  07271aa42d13378e67ebd79ea9ca1c4a5e2ad46f
    Gitweb: http://git.kernel.org/tip/07271aa42d13378e67ebd79ea9ca1c4a5e2ad46f
    Author: Chase Douglas <chase.douglas@canonical.com>
    AuthorDate: Fri, 23 Apr 2010 14:02:39 -0400
    Committer: Steven Rostedt <rostedt@goodmis.org>
    CommitDate: Tue, 27 Apr 2010 16:51:49 -0400

    tracing: Add documentation for trace commands mod, traceon/traceoff

    The mod command went in as commit
    64e7c440618998fd69eee6ab490b042d12248021

    The traceon/traceoff commands went in as commit
    23b4ff3aa479c9e3bb23cb6b2d0a97878399784a

    Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
    LKML-Reference: <1272045759-32018-1-git-send-email-chase.douglas@canonical.com>
    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
    ---
    Documentation/trace/ftrace.txt | 44 ++++++++++++++++++++++++++++++++++++++++
    1 files changed, 44 insertions(+), 0 deletions(-)

    diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
    index 5201181..557c1ed 100644
    --- a/Documentation/trace/ftrace.txt
    +++ b/Documentation/trace/ftrace.txt
    @@ -155,6 +155,9 @@ of ftrace. Here is a list of some of the key files:
    to be traced. Echoing names of functions into this file
    will limit the trace to only those functions.

    + This interface also allows for commands to be used. See the
    + "Filter commands" section for more details.
    +
    set_ftrace_notrace:

    This has an effect opposite to that of
    @@ -1824,6 +1827,47 @@ this special filter via:
    echo > set_graph_function


    +Filter commands
    +---------------
    +
    +A few commands are supported by the set_ftrace_filter interface.
    +Trace commands have the following format:
    +
    +<function>:<command>:<parameter>
    +
    +The following commands are supported:
    +
    +- mod
    + This command enables function filtering per module. The
    + parameter defines the module. For example, if only the write*
    + functions in the ext3 module are desired, run:
    +
    + echo 'write*:mod:ext3' > set_ftrace_filter
    +
    + This command interacts with the filter in the same way as
    + filtering based on function names. Thus, adding more functions
    + in a different module is accomplished by appending (>>) to the
    + filter file. Remove specific module functions by prepending
    + '!':
    +
    + echo '!writeback*:mod:ext3' >> set_ftrace_filter
    +
    +- traceon/traceoff
    + These commands turn tracing on and off when the specified
    + functions are hit. The parameter determines how many times the
    + tracing system is turned on and off. If unspecified, there is
    + no limit. For example, to disable tracing when a schedule bug
    + is hit the first 5 times, run:
    +
    + echo '__schedule_bug:traceoff:5' > set_ftrace_filter
    +
    + These commands are cumulative whether or not they are appended
    + to set_ftrace_filter. To remove a command, prepend it by '!'
    + and drop the parameter:
    +
    + echo '!__schedule_bug:traceoff' > set_ftrace_filter
    +
    +
    trace_pipe
    ----------


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