trace-cmd-stack – read, enable or disable Ftrace Linux kernel stack tracing. Synopsistrace-cmd stack DescriptionThe trace-cmd(1) stack enables the Ftrace stack tracer within the kernel. The stack tracer enables the function tracer and at each function call within the kernel, the stack is checked. When a new maximum usage stack is discovered, it is recorded. When…
trace-cmd-split – split a trace.dat file into smaller files Synopsistrace-cmd split [OPTIONS] [start-time [end-time]] DescriptionThe trace-cmd(1) split is used to break up a trace.dat into small files. The start-time specifies where the new file will start at. Using trace-cmd-report(1) and copying the time stamp given at a particular event, can be used as input for…
trace-cmd-snapshot – take, reset, free, or show a Ftrace kernel snapshot Synopsistrace-cmd snapshot [OPTIONS] DescriptionThe trace-cmd(1) snapshot controls or displays the Ftrace Linux kernel snapshot feature (if the kernel supports it). This is useful to "freeze" an instance of a live trace but without stopping the trace. trace-cmd start -p function trace-cmd snapshot -s trace-cmd…
trace-cmd-show – show the contents of the Ftrace Linux kernel tracing buffer. Synopsistrace-cmd show [OPTIONS] DescriptionThe 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/traceOptions-p Instead of displaying the contents of the "trace" file, use the "trace_pipe"…
trace-cmd-restore – restore a failed trace record Synopsistrace-cmd restore [OPTIONS] [command] cpu-file [cpu-file …] DescriptionThe trace-cmd(1) restore command will restore a crashed trace-cmd-record(1) file. If for some reason a trace-cmd record fails, it will leave a the per-cpu data files and not create the final trace.dat file. The trace-cmd restore will append the files to…
trace-cmd-reset – turn off all Ftrace tracing to bring back full performance Synopsistrace-cmd reset [OPTIONS] DescriptionThe 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…
trace-cmd-report – show in ASCII a trace created by trace-cmd record Synopsistrace-cmd report [OPTIONS] [input-file] DescriptionThe trace-cmd(1) report command will output a human readable report of a trace created by trace-cmd record. Options-i input-file By default, trace-cmd report will read the file trace.dat. But the -i option open up the given input-file instead. Note, the…
trace-cmd-record – record a trace from the Ftrace Linux internal tracer Synopsistrace-cmd record [OPTIONS] [command] DescriptionThe trace-cmd(1) record command will set up the Ftrace Linux kernel tracer to record the specified plugins or events that happen while the command executes. If no command is given, then it will record until the user hits Ctrl-C. The…
trace-cmd-profile – profile tasks running live Synopsistrace-cmd profile [OPTIONS] [command] DescriptionThe trace-cmd(1) profile will start tracing just like trace-cmd-record(1), with the –profile option, except that it does not write to a file, but instead, it will read the events as they happen and will update the accounting of the events. When the trace is finished,…
trace-cmd-options – list available options from trace-cmd plugins Synopsistrace-cmd options DescriptionThe trace-cmd(1) options command will examine all the trace-cmd plugins that are used by trace-cmd report(1) and list them. See Alsotrace-cmd(1), trace-cmd-record(1), trace-cmd-start(1), trace-cmd-stop(1), trace-cmd-extract(1), trace-cmd-reset(1), trace-cmd-split(1), trace-cmd-list(1), trace-cmd-listen(1) AuthorWritten by Steven Rostedt, <m[blue]rostedt [at] goodmis.orgm[][1]> Resourcesgit://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git CopyingCopyright (C) 2011 Red Hat, Inc. Free use…
trace-cmd-mem – show memory usage of certain kmem events Synopsistrace-cmd mem [OPTIONS][input-file] DescriptionThe trace-cmd(1) mem requires a trace-cmd record that enabled the following events: kmalloc kmalloc_node kfree kmem_cache_alloc kmem_cache_alloc_node kmem_cache_alloc_free It then reads the amount requested and the ammount freed as well as the functions that called the allocation. It then reports the final amount…
trace-cmd-listen – listen for incoming connection to record tracing. Synopsistrace-cmd listen -p port [OPTIONS] DescriptionThe trace-cmd(1) listen sets up a port to listen to waiting for connections from other hosts that run trace-cmd-record(1) with the -N option. When a connection is made, and the remote host sends data, it will create a file called trace.HOST:PORT.dat….
trace-cmd-list – list available plugins, events or options for Ftrace. Synopsistrace-cmd list [OPTIONS] DescriptionThe trace-cmd(1) list displays the available plugins, events or Ftrace options that are configured on the current machine. If no option is given, then it lists all plugins, events and Ftrace options to standard output. Options-e [regex] This option will list the…
trace-cmd-hist – show histogram of events in trace.dat file Synopsistrace-cmd hist [OPTIONS][input-file] DescriptionThe trace-cmd(1) hist displays a histogram form from the trace.dat file. Instead of showing the events as they were ordered, it creates a histogram that can be displayed per task or for all tasks where the most common events appear first. It uses…
trace-cmd-extract – extract out the data from the Ftrace Linux tracer. Synopsistrace-cmd extract [OPTIONS] DescriptionThe trace-cmd(1) extract is usually used after trace-cmd-start(1) and trace-cmd-stop(1). It can be used after the Ftrace tracer has been started manually through the Ftrace pseudo file system. The extract command creates a trace.dat file that can be used by trace-cmd-report(1)…
trace-cmd-check-events – parse the event formats on local system Synopsistrace-cmd check-events [OPTIONS] DescriptionThe trace-cmd(1) check-events parses format strings for all the events on the local system. It returns whether all the format strings can be parsed correctly. It will load plugins unless specified otherwise. This is useful to check for any trace event format strings…
tr – translate or delete characters Synopsistr [,OPTION/]… ,SET1 /[,SET2/] DescriptionTranslate, squeeze, and/or delete characters from standard input, writing to standard output. -c, -C, –complement use the complement of SET1 -d, –delete delete characters in SET1, do not translate -s, –squeeze-repeats replace each sequence of a repeated character that is listed in the last specified…
tput, reset – initialize a terminal or query terminfo database Synopsistput [-Ttype] capname [parameters] tput [-Ttype] [-x] clear tput [-Ttype] init tput [-Ttype] reset tput [-Ttype] longname tput -S << tput -V DescriptionThe tput utility uses the terminfo database to make the values of terminal-dependent capabilities and information available to the shell (see sh(1)), to…
TPM Management – tpmtoken_setpasswd Nametpmtoken_setpasswd – change the password(s) associated with the user’s TPM PKCS#11 data store Synopsistpmtoken_setpasswd [ OPTION ] Descriptiontpmtoken_setpasswd is used to change the password(s) associated with the user’s data store. PKCS#11 requires a password (or PIN) for the Security Officer (SO) and the User. The SO and User password are set…
TPM Management – tpmtoken_protect Nametpmtoken_protect – encrypt or decrypt data using a symmetric key stored in the user’s TPM PKCS#11 data store Synopsistpmtoken_protect [ OPTION ] Descriptiontpmtoken_protect will encrypt or decrypt data using a symmetric key that is stored in the user’s data store. The key used to protect the data is a 256-bit AES…