top: document all of top's new smaps_rollup provisions
[ of course, we had to renumber most existing fields ] [ with these additions. plus, some typos were fixed. ] Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
Craig Small
parent
b05770d94a
commit
788cbe051b
121
top/top.1
121
top/top.1
@ -62,7 +62,7 @@
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.
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.\" Document /////////////////////////////////////////////////////////////
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.\" ----------------------------------------------------------------------
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.TH TOP 1 "February 2021" "procps-ng" "User Commands"
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.TH TOP 1 "April 2021" "procps-ng" "User Commands"
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.\" ----------------------------------------------------------------------
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.nh
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@ -818,10 +818,39 @@ the operating itself was not preemptible.
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And while the 2.6 kernel can be made mostly preemptible, it is not always so.
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.TP 4
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24.\fB RES \*(Em Resident Memory Size (KiB) \fR
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24.\fB PSS \*(Em Proportional Resident Memory, smaps (KiB) \fR
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The proportion of this task's share of `RSS' where each page is divided by
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the number of processes sharing it.
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It is also the sum of the `PSan', `PSfd' and `PSsh' fields.
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For example, if a process has 1000 resident pages alone and 1000 resident
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pages shared with another process, its `PSS' would be 1500 (times page size).
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Accessing smaps values is 10x more costly than
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other memory statistics and data for other users
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requires root privileges.
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.PP
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25.\fB PSan \*(Em Proportional Anonymous Memory, smaps (KiB) \fR
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.br
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26.\fB PSfd \*(Em Proportional File Memory, smaps (KiB) \fR
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.br
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27.\fB PSsh \*(Em Proportional Shmem Memory, smaps (KiB) \fR
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.RS 4
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As was true for `PSS' above (total proportional resident memory),
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these fields represent the proportion of this task's share of each type
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of memory divided by the number of processes sharing it.
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Accessing smaps values is 10x more costly than
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other memory statistics and data for other users
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requires root privileges.
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.RE
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.TP 4
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28.\fB RES \*(Em Resident Memory Size (KiB) \fR
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A subset of the virtual address space (VIRT) representing the non-swapped
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\*(MP a task is currently using.
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It is also the sum of the RSan, RSfd and RSsh fields.
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It is also the sum of the `RSan', `RSfd' and `RSsh' fields.
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It can include private anonymous pages, private pages mapped to files
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(including program images and shared libraries) plus shared anonymous pages.
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@ -833,35 +862,45 @@ modified, act as a dedicated \*(MS and thus will never impact SWAP.
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\*(XX.
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.TP 4
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25.\fB RSan \*(Em Resident Anonymous Memory Size (KiB) \fR
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29.\fB RSS \*(Em Resident Memory, smaps (KiB) \fR
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Another, more precise view of process non-swapped \*(MP.
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It is obtained from the `smaps_rollup' file and is
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generally slightly larger than that shown for `RES'.
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Accessing smaps values is 10x more costly than
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other memory statistics and data for other users
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requires root privileges.
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.TP 4
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30.\fB RSan \*(Em Resident Anonymous Memory Size (KiB) \fR
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A subset of resident memory (RES) representing private pages not
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mapped to a file.
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.TP 4
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26.\fB RSfd \*(Em Resident File-Backed Memory Size (KiB) \fR
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31.\fB RSfd \*(Em Resident File-Backed Memory Size (KiB) \fR
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A subset of resident memory (RES) representing the implicitly shared
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pages supporting program images and shared libraries.
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It also includes explicit file mappings, both private and shared.
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.TP 4
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27.\fB RSlk \*(Em Resident Locked Memory Size (KiB) \fR
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32.\fB RSlk \*(Em Resident Locked Memory Size (KiB) \fR
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A subset of resident memory (RES) which cannot be swapped out.
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.TP 4
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28.\fB RSsh \*(Em Resident Shared Memory Size (KiB) \fR
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33.\fB RSsh \*(Em Resident Shared Memory Size (KiB) \fR
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A subset of resident memory (RES) representing the explicitly shared
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anonymous shm*/mmap pages.
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.TP 4
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29.\fB RUID \*(Em Real User Id \fR
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34.\fB RUID \*(Em Real User Id \fR
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The\fI real\fR user ID.
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.TP 4
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30.\fB RUSER \*(Em Real User Name \fR
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35.\fB RUSER \*(Em Real User Name \fR
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The\fI real\fR user name.
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.TP 4
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31.\fB S \*(Em Process Status \fR
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36.\fB S \*(Em Process Status \fR
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The status of the task which can be one of:
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\fBD\fR = uninterruptible sleep
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\fBI\fR = idle
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@ -877,7 +916,7 @@ Even without a true SMP machine, you may see numerous tasks in this state
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depending on \*(We's delay interval and nice value.
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.TP 4
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32.\fB SHR \*(Em Shared Memory Size (KiB) \fR
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37.\fB SHR \*(Em Shared Memory Size (KiB) \fR
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A subset of resident memory (RES) that may be used by other processes.
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It will include shared anonymous pages and shared file-backed pages.
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It also includes private pages mapped to files representing
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@ -886,7 +925,7 @@ program images and shared libraries.
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\*(XX.
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.TP 4
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33.\fB SID \*(Em Session Id \fR
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38.\fB SID \*(Em Session Id \fR
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A session is a collection of process groups (\*(Xa PGRP),
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usually established by the login shell.
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A newly forked process joins the session of its creator.
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@ -895,11 +934,11 @@ member of the session, called the session leader, which is usually the
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login shell.
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.TP 4
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34.\fB SUID \*(Em Saved User Id \fR
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39.\fB SUID \*(Em Saved User Id \fR
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The\fI saved\fR user ID.
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.TP 4
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35.\fB SUPGIDS \*(Em Supplementary Group IDs \fR
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40.\fB SUPGIDS \*(Em Supplementary Group IDs \fR
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The IDs of any supplementary group(s) established at login or
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inherited from a task's parent.
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They are displayed in a comma delimited list.
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@ -909,7 +948,7 @@ When displayed, it plus any other variable width columns will be allocated
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all remaining screen width (up to the maximum \*(WX characters).
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.TP 4
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36.\fB SUPGRPS \*(Em Supplementary Group Names \fR
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41.\fB SUPGRPS \*(Em Supplementary Group Names \fR
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The names of any supplementary group(s) established at login or
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inherited from a task's parent.
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They are displayed in a comma delimited list.
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@ -919,24 +958,24 @@ When displayed, it plus any other variable width columns will be allocated
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all remaining screen width (up to the maximum \*(WX characters).
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.TP 4
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37.\fB SUSER \*(Em Saved User Name \fR
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42.\fB SUSER \*(Em Saved User Name \fR
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The\fI saved\fR user name.
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.TP 4
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38.\fB SWAP \*(Em Swapped Size (KiB) \fR
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43.\fB SWAP \*(Em Swapped Size (KiB) \fR
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The formerly resident portion of a task's address space written
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to the \*(MS when \*(MP becomes over committed.
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\*(XX.
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.TP 4
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39.\fB TGID \*(Em Thread Group Id \fR
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44.\fB TGID \*(Em Thread Group Id \fR
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The ID of the thread group to which a task belongs.
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It is the PID of the thread group leader.
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In kernel terms, it represents those tasks that share an mm_struct.
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.TP 4
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40.\fB TIME \*(Em \*(PU Time \fR
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45.\fB TIME \*(Em \*(PU Time \fR
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Total \*(PU time the task has used since it started.
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When Cumulative mode is \*O, each process is listed with the \*(Pu
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time that it and its dead children have used.
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@ -944,19 +983,19 @@ You toggle Cumulative mode with `S', which is both a \*(CO and an \*(CI.
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\*(XC `S' \*(CI for additional information regarding this mode.
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.TP 4
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41.\fB TIME+ \*(Em \*(PU Time, hundredths \fR
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46.\fB TIME+ \*(Em \*(PU Time, hundredths \fR
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The same as TIME, but reflecting more granularity through hundredths
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of a second.
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.TP 4
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42.\fB TPGID \*(Em Tty Process Group Id \fR
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47.\fB TPGID \*(Em Tty Process Group Id \fR
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The process group ID of the foreground process for the connected tty,
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or \-1 if a process is not connected to a terminal.
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By convention, this value equals the process ID (\*(Xa PID) of the
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process group leader (\*(Xa PGRP).
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.TP 4
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43.\fB TTY \*(Em Controlling Tty \fR
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48.\fB TTY \*(Em Controlling Tty \fR
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The name of the controlling terminal.
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This is usually the device (serial port, pty, etc.) from which the
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process was started, and which it uses for input or output.
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@ -964,22 +1003,22 @@ However, a task need not be associated with a terminal, in which case
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you'll see `?' displayed.
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.TP 4
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44.\fB UID \*(Em User Id \fR
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49.\fB UID \*(Em User Id \fR
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The\fI effective\fR user ID of the task's owner.
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.TP 4
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45.\fB USED \*(Em Memory in Use (KiB) \fR
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50.\fB USED \*(Em Memory in Use (KiB) \fR
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This field represents the non-swapped \*(MP a task is using (RES) plus
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the swapped out portion of its address space (SWAP).
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\*(XX.
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.TP 4
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46.\fB USER \*(Em User Name \fR
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51.\fB USER \*(Em User Name \fR
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The\fI effective\fR user name of the task's owner.
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.TP 4
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47.\fB VIRT \*(Em Virtual Memory Size (KiB) \fR
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52.\fB VIRT \*(Em Virtual Memory Size (KiB) \fR
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The total amount of \*(MV used by the task.
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It includes all code, data and shared libraries plus pages that have been
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swapped out and pages that have been mapped but not used.
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@ -987,13 +1026,13 @@ swapped out and pages that have been mapped but not used.
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\*(XX.
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.TP 4
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48.\fB WCHAN \*(Em Sleeping in Function \fR
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53.\fB WCHAN \*(Em Sleeping in Function \fR
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This field will show the name of the kernel function in which the task
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is currently sleeping.
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Running tasks will display a dash (`\-') in this column.
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.TP 4
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49.\fB nDRT \*(Em Dirty Pages Count \fR
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54.\fB nDRT \*(Em Dirty Pages Count \fR
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The number of pages that have been modified since they were last
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written to \*(AS.
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Dirty pages must be written to \*(AS before the corresponding physical
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@ -1002,7 +1041,7 @@ memory location can be used for some other virtual page.
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This field was deprecated with linux 2.6 and is always zero.
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.TP 4
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50.\fB nMaj \*(Em Major Page Fault Count \fR
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55.\fB nMaj \*(Em Major Page Fault Count \fR
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The number of\fB major\fR page faults that have occurred for a task.
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A page fault occurs when a process attempts to read from or write to a
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virtual page that is not currently present in its address space.
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@ -1010,7 +1049,7 @@ A major page fault is when \*(AS access is involved in making that
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page available.
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.TP 4
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51.\fB nMin \*(Em Minor Page Fault count \fR
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56.\fB nMin \*(Em Minor Page Fault count \fR
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The number of\fB minor\fR page faults that have occurred for a task.
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A page fault occurs when a process attempts to read from or write to a
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virtual page that is not currently present in its address space.
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@ -1018,50 +1057,50 @@ A minor page fault does not involve \*(AS access in making that
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page available.
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.TP 4
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52.\fB nTH \*(Em Number of Threads \fR
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57.\fB nTH \*(Em Number of Threads \fR
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The number of threads associated with a process.
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.TP 4
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53.\fB nsIPC \*(Em IPC namespace \fR
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58.\fB nsIPC \*(Em IPC namespace \fR
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The Inode of the namespace used to isolate interprocess communication (IPC)
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resources such as System V IPC objects and POSIX message queues.
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.TP 4
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54.\fB nsMNT \*(Em MNT namespace \fR
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59.\fB nsMNT \*(Em MNT namespace \fR
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The Inode of the namespace used to isolate filesystem mount points thus
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offering different views of the filesystem hierarchy.
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.TP 4
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55.\fB nsNET \*(Em NET namespace \fR
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60.\fB nsNET \*(Em NET namespace \fR
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The Inode of the namespace used to isolate resources such as network devices,
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IP addresses, IP routing, port numbers, etc.
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.TP 4
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56.\fB nsPID \*(Em PID namespace \fR
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61.\fB nsPID \*(Em PID namespace \fR
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The Inode of the namespace used to isolate process ID numbers
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meaning they need not remain unique.
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Thus, each such namespace could have its own `init/systemd' (PID #1) to
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manage various initialization tasks and reap orphaned child processes.
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.TP 4
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57.\fB nsUSER \*(Em USER namespace \fR
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62.\fB nsUSER \*(Em USER namespace \fR
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The Inode of the namespace used to isolate the user and group ID numbers.
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Thus, a process could have a normal unprivileged user ID outside a user
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namespace while having a user ID of 0, with full root privileges, inside
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that namespace.
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.TP 4
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58.\fB nsUTS \*(Em UTS namespace \fR
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63.\fB nsUTS \*(Em UTS namespace \fR
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The Inode of the namespace used to isolate hostname and NIS domain name.
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UTS simply means "UNIX Time-sharing System".
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.TP 4
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59.\fB vMj \*(Em Major Page Fault Count Delta\fR
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64.\fB vMj \*(Em Major Page Fault Count Delta\fR
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The number of\fB major\fR page faults that have occurred since the
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last update (see nMaj).
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.TP 4
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60.\fB vMn \*(Em Minor Page Fault Count Delta\fR
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65.\fB vMn \*(Em Minor Page Fault Count Delta\fR
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The number of\fB minor\fR page faults that have occurred since the
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last update (see nMin).
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@ -1481,7 +1520,7 @@ of 165 columns would be required.
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\ \ \ \fB!\fR\ \ :\fICombine-Cpus-Mode \fR
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This \*(CT is intended for massively parallel SMP environments where,
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even with the `4' \*(CT, not all processors can be displayed.
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With each press of `!' the number of additional \*(Pu's combined is
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With each press of `!' the number of additional \*(Pus combined is
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doubled thus reducing the total number of \*(Pu lines displayed.
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For example, with the first press of `!' one additional \*(Pu will be
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@ -2032,7 +2071,7 @@ Such highlighting will be restored when a window's search string is empty.
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.\" ----------------------------------------------------------------------
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You can use this `Other Filter' feature to establish selection criteria which
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will then determine which tasks are shown in the \*(CW.
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Such filters can be made presistent if preserved in the rcfile via
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Such filters can be made persistent if preserved in the rcfile via
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the 'W' \*(CI.
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Establishing a filter requires: 1) a field name; 2) an operator; and
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