Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

trace-cmd-reset(1)

NAME

   trace-cmd-reset - turn off all Ftrace tracing to bring back full
   performance

SYNOPSIS

   trace-cmd reset [OPTIONS]

DESCRIPTION

   The trace-cmd(1) reset command turns off all tracing of Ftrace. This
   will bring back the performance of the system before tracing was
   enabled. This is necessary since trace-cmd-record(1), trace-cmd-stop(1)
   and trace-cmd-extract(1) do not disable the tracer, event after the
   data has been pulled from the buffers. The rational is that the user
   may want to manually enable the tracer with the Ftrace pseudo file
   system, or examine other parts of Ftrace to see what trace-cmd did.
   After the reset command happens, the data in the ring buffer, and the
   options that were used are all lost.

OPTIONS

   Please note that the order that options are specified on the command
   line is significant. See EXAMPLES.

   -b buffer_size
       When the kernel boots, the Ftrace ring buffer is of a minimal size
       (3 pages per CPU). The first time the tracer is used, the ring
       buffer size expands to what it was set for (default 1.4 Megs per
       CPU).

           If no more tracing is to be done, this option allows you to shrink the
           ring buffer down to free up available memory.

           trace-cmd reset -b 1

           The buffer instance affected is the one (or ones) specified by the most
           recently preceding *-B*, *-t*, or *-a* option:

           When used after *-B*, resizes the buffer instance that precedes it on
           the command line.

           When used after *-a*, resizes all buffer instances except the top one.

           When used after *-t* or before any *-B* or *-a*, resizes the top
           instance.

   -B buffer-name
       If the kernel supports multiple buffers, this will reset the trace
       for only the given buffer. It does not affect any other buffer.
       This may be used multiple times to specify different buffers. The
       top level buffer will not be reset if this option is given (unless
       the -t option is also supplied).

   -a
       Reset the trace for all existing buffer instances. When this option
       is used, the top level instance will not be reset unless -t is
       given.

   -d
       This option deletes the instance buffer(s) specified by the most
       recently preceding -B or -a option. Because the top-level instance
       buffer cannot be deleted, it is invalid to use this immediatly
       following -t or prior to any -B or -a option on the command line.

   -t
       Resets the top level instance buffer. Without the -B or -a option
       this is the same as the default. But if -B or -a is used, this is
       required if the top level instance buffer should also be reset.

EXAMPLES

   Reset tracing for instance-one and set its per-cpu buffer size to
   4096kb. Also deletes instance-two. The top level instance and any other
   instances remain unaffected:

       trace-cmd reset -B instance-one -b 4096 -B instance-two -d

   Delete all instance buffers. Top level instance remains unaffected:

       trace-cmd reset -a -d

   Delete all instance buffers and also reset the top instance:

       trace-cmd reset -t -a -d

   Invalid. This command implies an attempt to delete the top instance:

       trace-cmd reset -a -t -d

   Reset the top instance and set its per-cpu buffer size to 1024kb. If
   any instance buffers exist, they will be unaffected:

       trace-cmd reset -b 1024

SEE ALSO

   trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1),
   trace-cmd-start(1), trace-cmd-stop(1), trace-cmd-extract(1),
   trace-cmd-split(1), trace-cmd-list(1), trace-cmd-listen(1)

AUTHOR

   Written by Steven Rostedt, <[email protected][1]>

RESOURCES

   git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/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).

NOTES

    1. [email protected]
       mailto:[email protected]

                              07/17/2016                TRACE-CMD-RESET(1)



Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.


Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.


Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.


birds banner