Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+.TH PIDSTAT 1 "JULY 2018" Linux "Linux User's Manual" -*- nroff -*-
+.SH NAME
+pidstat \- Report statistics for Linux tasks.
+.SH SYNOPSIS
+.B pidstat [ -d ] [ -H ] [ -h ] [ -I ] [ -l ] [ -R ] [ -r ] [ -s ] [ -t ] [ -U [
+.I username
+.B ] ] [ -u ] [ -V ] [ -v ]
+.B [ -w ] [ -C
+.I comm
+.B ] [ -G
+.I process_name
+.B ] [ --dec={ 0 | 1 | 2 } ] [ --human ] [ -p {
+.I pid
+.B [,...] | SELF | ALL } ] [ -T { TASK | CHILD | ALL } ] [
+.I interval
+.B [
+.I count
+.B ] ] [ -e
+.I program
+.I args
+.B ]
+.SH DESCRIPTION
+The
+.B pidstat
+command is used for monitoring individual tasks currently being managed
+by the Linux kernel.
+It writes to standard output activities for every task selected with option
+.B -p
+or for every task managed by the Linux kernel if option
+.B -p ALL
+has been used. Not selecting any tasks is equivalent to specifying
+.B -p ALL
+but only active tasks (tasks with non-zero statistics values)
+will appear in the report.
+
+The
+.B pidstat
+command can also be used for monitoring the child processes of selected tasks.
+Read about option
+.B -T
+below.
+
+The
+.I interval
+parameter specifies the amount of time in seconds between each report.
+A value of 0 (or no parameters at all) indicates that tasks statistics are
+to be reported for the time since system startup (boot).
+The
+.I count
+parameter can be specified in conjunction with the
+.I interval
+parameter if this one is not set to zero. The value of
+.I count
+determines the number of reports generated at
+.I interval
+seconds apart. If the
+.I interval
+parameter is specified without the
+.I count
+parameter, the
+.B pidstat
+command generates reports continuously.
+
+You can select information about specific task activities using flags.
+Not specifying any flags selects only CPU activity.
+
+.SH OPTIONS
+.IP "-C comm"
+Display only tasks whose command name includes the string
+.IR comm .
+This string can be a regular expression.
+.IP -d
+Report I/O statistics (kernels 2.6.20 and later only).
+The following values may be displayed:
+
+.B UID
+.RS
+.RS
+The real user identification number of the task being monitored.
+.RE
+
+.B USER
+.RS
+The name of the real user owning the task being monitored.
+.RE
+
+.B PID
+.RS
+The identification number of the task being monitored.
+.RE
+
+.B kB_rd/s
+.RS
+Number of kilobytes the task has caused to be read from disk
+per second.
+.RE
+
+.B kB_wr/s
+.RS
+Number of kilobytes the task has caused, or shall cause to be
+written to disk per second.
+.RE
+
+.B kB_ccwr/s
+.RS
+Number of kilobytes whose writing to disk has been cancelled by
+the task. This may occur when the task truncates some
+dirty pagecache. In this case, some IO which another task has
+been accounted for will not be happening.
+.RE
+
+.B iodelay
+.RS
+Block I/O delay of the task being monitored,
+measured in clock ticks. This metric includes the delays spent
+waiting for sync block I/O completion and for swapin block I/O
+completion.
+.RE
+
+.B Command
+.RS
+The command name of the task.
+.RE
+.RE
+.IP "--dec={ 0 | 1 | 2 }"
+Specify the number of decimal places to use (0 to 2, default value is 2).
+.IP "-e program args"
+Execute
+.IR program
+with given arguments
+.IR args
+and monitor it with
+.B pidstat.
+.B pidstat
+stops when
+.IR program
+terminates.
+.IP "-G process_name"
+Display only processes whose command name includes the string
+.IR process_name .
+This string can be a regular expression. If option -t is used
+together with option -G then the threads belonging to that
+process are also displayed (even if their command name doesn't
+include the string
+.IR process_name ).
+.IP -H
+Display timestamp in seconds since the epoch.
+.IP -h
+Display all activities horizontally on a single line, with no
+average statistics at the end of the report. This is
+intended to make it easier to be parsed by other programs.
+.IP --human
+Print sizes in human readable format (e.g. 1.0k, 1.2M, etc.)
+The units displayed with this option supersede any other default units (e.g.
+kilobytes, sectors...) associated with the metrics.
+.IP -I
+In an SMP environment, indicate that tasks CPU usage
+(as displayed by option
+.B -u
+) should be divided by the total number of processors.
+.IP -l
+Display the process command name and all its arguments.
+.IP "-p { pid [,...] | SELF | ALL }"
+Select tasks (processes) for which statistics are to be reported.
+.I pid
+is the process identification number. The
+.B SELF
+keyword indicates that statistics are to be reported for the
+.B pidstat
+process itself, whereas the
+.B ALL
+keyword indicates that statistics are to be reported for all the
+tasks managed by the system.
+.IP -R
+Report realtime priority and scheduling policy information.
+The following values may be displayed:
+
+.B UID
+.RS
+.RS
+The real user identification number of the task being monitored.
+.RE
+
+.B USER
+.RS
+The name of the real user owning the task being monitored.
+.RE
+
+.B PID
+.RS
+The identification number of the task being monitored.
+.RE
+
+.B prio
+.RS
+The realtime priority of the task being monitored.
+.RE
+
+.B policy
+.RS
+The scheduling policy of the task being monitored.
+.RE
+
+.B Command
+.RS
+The command name of the task.
+.RE
+.RE
+.IP -r
+Report page faults and memory utilization.
+
+When reporting statistics for individual tasks,
+the following values may be displayed:
+
+.B UID
+.RS
+.RS
+The real user identification number of the task being monitored.
+.RE
+
+.B USER
+.RS
+The name of the real user owning the task being monitored.
+.RE
+
+.B PID
+.RS
+The identification number of the task being monitored.
+.RE
+
+.B minflt/s
+.RS
+Total number of minor faults the task has made per second, those
+which have not required loading a memory page from disk.
+.RE
+
+.B majflt/s
+.RS
+Total number of major faults the task has made per second, those
+which have required loading a memory page from disk.
+.RE
+
+.B VSZ
+.RS
+Virtual Size: The virtual memory usage of entire task in kilobytes.
+.RE
+
+.B RSS
+.RS
+Resident Set Size: The non-swapped physical memory
+used by the task in kilobytes.
+.RE
+
+.B %MEM
+.RS
+The tasks's currently used share of available physical memory.
+.RE
+
+.B Command
+.RS
+The command name of the task.
+.RE
+
+When reporting global statistics for tasks and all their children,
+the following values may be displayed:
+
+.B UID
+.RS
+The real user identification number of the task which is being monitored
+together with its children.
+.RE
+
+.B USER
+.RS
+The name of the real user owning the task which is being monitored
+together with its children.
+.RE
+
+.B PID
+.RS
+The identification number of the task which is being monitored
+together with its children.
+.RE
+
+.B minflt-nr
+.RS
+Total number of minor faults made by the task and all its children,
+and collected during the interval of time.
+.RE
+
+.B majflt-nr
+.RS
+Total number of major faults made by the task and all its children,
+and collected during the interval of time.
+.RE
+
+.B Command
+.RS
+The command name of the task which is being monitored
+together with its children.
+.RE
+.RE
+.IP -s
+Report stack utilization.
+The following values may be displayed:
+
+.B UID
+.RS
+.RS
+The real user identification number of the task being monitored.
+.RE
+
+.B USER
+.RS
+The name of the real user owning the task being monitored.
+.RE
+
+.B PID
+.RS
+The identification number of the task being monitored.
+.RE
+
+.B StkSize
+.RS
+The amount of memory in kilobytes reserved for the task as stack,
+but not necessarily used.
+.RE
+
+.B StkRef
+.RS
+The amount of memory in kilobytes used as stack, referenced by the task.
+.RE
+
+.B Command
+.RS
+The command name of the task.
+.RE
+.RE
+.IP "-T { TASK | CHILD | ALL }"
+This option specifies what has to be monitored by the
+.B pidstat
+command. The
+.B TASK
+keyword indicates that statistics are to be reported for individual tasks
+(this is the default option) whereas the
+.B CHILD
+keyword indicates that statistics are to be globally reported for the
+selected tasks and all their children. The
+.B ALL
+keyword indicates that statistics are to be reported for
+individual tasks and globally for the selected
+tasks and their children.
+
+Note: Global statistics for tasks and all their children are not available
+for all options of
+.B pidstat.
+Also these statistics are not necessarily relevant to current time interval:
+The statistics of a child process are collected only when it finishes or
+it is killed.
+.IP -t
+Also display statistics for threads associated with selected tasks.
+
+This option adds the following values to the reports:
+
+.B TGID
+.RS
+.RS
+The identification number of the thread group leader.
+.RE
+
+.B TID
+.RS
+The identification number of the thread being monitored.
+.RE
+.RE
+.IP "-U [ username ]"
+Display the real user name of the tasks being monitored instead of the UID.
+If
+.I username
+is specified, then only tasks belonging to the specified user are displayed.
+.IP -u
+Report CPU utilization.
+
+When reporting statistics for individual tasks,
+the following values may be displayed:
+
+.B UID
+.RS
+.RS
+The real user identification number of the task being monitored.
+.RE
+
+.B USER
+.RS
+The name of the real user owning the task being monitored.
+.RE
+
+.B PID
+.RS
+The identification number of the task being monitored.
+.RE
+
+.B %usr
+.RS
+Percentage of CPU used by the task while executing at the user level
+(application), with or without nice priority. Note that this field
+does NOT include time spent running a virtual processor.
+.RE
+
+.B %system
+.RS
+Percentage of CPU used by the task while executing at the system level
+(kernel).
+.RE
+
+.B %guest
+.RS
+Percentage of CPU spent by the task in virtual machine (running a virtual
+processor).
+.RE
+
+.B %wait
+.RS
+Percentage of CPU spent by the task while waiting to run.
+.RE
+
+.B %CPU
+.RS
+Total percentage of CPU time used by the task. In an SMP environment,
+the task's CPU usage will be divided by the total number of CPU's if
+option
+.B -I
+has been entered on the command line.
+.RE
+
+.B CPU
+.RS
+Processor number to which the task is attached.
+.RE
+
+.B Command
+.RS
+The command name of the task.
+.RE
+
+When reporting global statistics for tasks and all their children,
+the following values may be displayed:
+
+.B UID
+.RS
+The real user identification number of the task which is being monitored
+together with its children.
+.RE
+
+.B USER
+.RS
+The name of the real user owning the task which is being monitored
+together with its children.
+.RE
+
+.B PID
+.RS
+The identification number of the task which is being monitored
+together with its children.
+.RE
+
+.B usr-ms
+.RS
+Total number of milliseconds spent
+by the task and all its children while executing at the
+user level (application), with or without nice priority, and
+collected during the interval of time. Note that this field does
+NOT include time spent running a virtual processor.
+.RE
+
+.B system-ms
+.RS
+Total number of milliseconds spent
+by the task and all its children while executing at the
+system level (kernel), and collected during the interval of time.
+.RE
+
+.B guest-ms
+.RS
+Total number of milliseconds spent
+by the task and all its children in virtual machine (running a virtual
+processor).
+.RE
+
+.B Command
+.RS
+The command name of the task which is being monitored
+together with its children.
+.RE
+.RE
+.IP -V
+Print version number then exit.
+.IP -v
+Report values of some kernel tables. The following values may be displayed:
+
+.B UID
+.RS
+.RS
+The real user identification number of the task being monitored.
+.RE
+
+.B USER
+.RS
+The name of the real user owning the task being monitored.
+.RE
+
+.B PID
+.RS
+The identification number of the task being monitored.
+.RE
+
+.B threads
+.RS
+Number of threads associated with current task.
+.RE
+
+.B fd-nr
+.RS
+Number of file descriptors associated with current task.
+.RE
+
+.B Command
+.RS
+The command name of the task.
+.RE
+.RE
+.IP -w
+Report task switching activity (kernels 2.6.23 and later only).
+The following values may be displayed:
+
+.B UID
+.RS
+.RS
+The real user identification number of the task being monitored.
+.RE
+
+.B USER
+.RS
+The name of the real user owning the task being monitored.
+.RE
+
+.B PID
+.RS
+The identification number of the task being monitored.
+.RE
+
+.B cswch/s
+.RS
+Total number of voluntary context switches the task made per second.
+A voluntary context switch occurs when a task blocks because it
+requires a resource that is unavailable.
+.RE
+
+.B nvcswch/s
+.RS
+Total number of non voluntary context switches the task made per second.
+A involuntary context switch takes place when a task executes
+for the duration of its time slice and then is forced to relinquish the
+processor.
+.RE
+
+.B Command
+.RS
+The command name of the task.
+.RE
+.RE
+.SH ENVIRONMENT
+The
+.B pidstat
+command takes into account the following environment variables:
+
+.IP S_COLORS
+When this variable is set, display statistics in color on the terminal.
+Possible values for this variable are
+.IR never ,
+.IR always
+or
+.IR auto
+(the latter is the default).
+
+Please note that the color (being red, yellow, or some other color) used to display a value
+is not indicative of any kind of issue simply because of the color. It only indicates different
+ranges of values.
+
+.IP S_COLORS_SGR
+Specify the colors and other attributes used to display statistics on the terminal.
+Its value is a colon-separated list of capabilities that defaults to
+.BR H=31;1:I=32;22:M=35;1:N=34;1:Z=34;22 .
+Supported capabilities are:
+
+.RS
+.TP
+.B H=
+SGR (Select Graphic Rendition) substring for percentage values greater than or equal to 75%.
+
+.TP
+.B I=
+SGR substring for item values like PID, UID or CPU number.
+
+.TP
+.B M=
+SGR substring for percentage values in the range from 50% to 75%.
+
+.TP
+.B N=
+SGR substring for non-zero statistics values and for tasks names.
+
+.TP
+.B Z=
+SGR substring for zero values and for threads names.
+.RE
+
+.IP S_TIME_FORMAT
+If this variable exists and its value is
+.BR ISO
+then the current locale will be ignored when printing the date in the report header.
+The
+.B pidstat
+command will use the ISO 8601 format (YYYY-MM-DD) instead.
+The timestamp will also be compliant with ISO 8601 format.
+
+.SH EXAMPLES
+.B pidstat 2 5
+.RS
+Display five reports of CPU statistics for every active task in the system
+at two second intervals.
+.RE
+
+.B pidstat -r -p 1643 2 5
+.RS
+Display five reports of page faults and memory statistics for
+PID 1643 at two second intervals.
+.RE
+
+.B pidstat -C """fox|bird"" -r -p ALL
+.RS
+Display global page faults and memory statistics for all the
+processes whose command name includes the string "fox" or "bird".
+.RE
+
+.B pidstat -T CHILD -r 2 5
+.RS
+Display five reports of page faults statistics at two second intervals
+for the child processes of all tasks in the system. Only child processes
+with non-zero statistics values are displayed.
+.SH BUGS
+.I /proc
+filesystem must be mounted for the
+.B pidstat
+command to work.
+
+.SH FILES
+.IR /proc
+contains various files with system statistics.
+
+.SH AUTHOR
+Sebastien Godard (sysstat <at> orange.fr)
+.SH SEE ALSO
+.BR sar (1),
+.BR top (1),
+.BR ps (1),
+.BR mpstat (1),
+.BR iostat (1),
+.BR vmstat (8)
+
+.I https://github.com/sysstat/sysstat
+
+.I http://pagesperso-orange.fr/sebastien.godard/