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top: accommodate the loss of that OOMEM_ENABLE #define

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Now that the conditional OOMEM_ENABLE has been removed
and all users exposed to those 'out of memory' fields,
it's about time we added them to the top man document.

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2016-06-02 00:00:00 -05:00
committed by Craig Small
parent 32db4e99a6
commit 29079d35e5
4 changed files with 67 additions and 80 deletions
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98
top/top.1
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@@ -69,7 +69,7 @@
.
.\" Document /////////////////////////////////////////////////////////////
.\" ----------------------------------------------------------------------
.TH TOP 1 "April 2016" "procps-ng" "User Commands"
.TH TOP 1 "May 2016" "procps-ng" "User Commands"
.\" ----------------------------------------------------------------------
.\" ----------------------------------------------------------------------
@@ -735,7 +735,19 @@ Zero in this field simply means priority will not be adjusted in determining
a task's dispatch-ability.
.TP 4
13.\fB P \*(Em Last used \*(PU (SMP) \fR
13.\fB OOMa \*(Em Out of Memory Adjustment Factor \fR
The value, ranging from -1000 to +1000, added to the current out of memory
score (OOMs) which is then used to determine which task to kill when memory
is exhausted.
.TP 4
14.\fB OOMs \*(Em Out of Memory Score \fR
The value, ranging from 0 to +1000, used to select task(s) to kill when memory
is exhausted.
Zero translates to `never kill' whereas 1000 means `always kill'.
.TP 4
15.\fB P \*(Em Last used \*(PU (SMP) \fR
A number representing the last used processor.
In a true SMP environment this will likely change frequently since the kernel
intentionally uses weak affinity.
@@ -744,7 +756,7 @@ processes to change \*(PUs more often (because of the extra demand for
\*(Pu time).
.TP 4
14.\fB PGRP \*(Em Process Group Id \fR
16.\fB PGRP \*(Em Process Group Id \fR
Every process is member of a unique process group which is used for
distribution of signals and by terminals to arbitrate requests for their
input and output.
@@ -754,7 +766,7 @@ By convention, this value equals the process ID (\*(Xa PID) of the first
member of a process group, called the process group leader.
.TP 4
15.\fB PID \*(Em Process Id \fR
17.\fB PID \*(Em Process Id \fR
The task's unique process ID, which periodically wraps, though never
restarting at zero.
In kernel terms, it is a dispatchable entity defined by a task_struct.
@@ -765,11 +777,11 @@ a thread group ID for the thread group leader (\*(Xa TGID);
and a TTY process group ID for the process group leader (\*(Xa TPGID).
.TP 4
16.\fB PPID \*(Em Parent Process Id \fR
18.\fB PPID \*(Em Parent Process Id \fR
The process ID (pid) of a task's parent.
.TP 4
17.\fB PR \*(Em Priority \fR
19.\fB PR \*(Em Priority \fR
The scheduling priority of the task.
If you see `rt' in this field, it means the task is running
under real time scheduling priority.
@@ -779,7 +791,7 @@ the operating itself was not preemptible.
And while the 2.6 kernel can be made mostly preemptible, it is not always so.
.TP 4
18.\fB RES \*(Em Resident Memory Size (KiB) \fR
20.\fB RES \*(Em Resident Memory Size (KiB) \fR
A subset of the virtual address space (VIRT) representing the non-swapped
\*(MP a task is currently using.
It is also the sum of the RSan, RSfd and RSsh fields.
@@ -794,35 +806,35 @@ modified, act as a dedicated \*(MS and thus will never impact SWAP.
\*(XX.
.TP 4
19.\fB RSan \*(Em Resident Anonymous Memory Size (KiB) \fR
21.\fB RSan \*(Em Resident Anonymous Memory Size (KiB) \fR
A subset of resident memory (RES) representing private pages not
mapped to a file.
.TP 4
20.\fB RSfd \*(Em Resident File-Backed Memory Size (KiB) \fR
22.\fB RSfd \*(Em Resident File-Backed Memory Size (KiB) \fR
A subset of resident memory (RES) representing the implicitly shared
pages supporting program images and shared libraries.
It also includes explicit file mappings, both private and shared.
.TP 4
21.\fB RSlk \*(Em Resident Locked Memory Size (KiB) \fR
23.\fB RSlk \*(Em Resident Locked Memory Size (KiB) \fR
A subset of resident memory (RES) which cannot be swapped out.
.TP 4
22.\fB RSsh \*(Em Resident Shared Memory Size (KiB) \fR
24.\fB RSsh \*(Em Resident Shared Memory Size (KiB) \fR
A subset of resident memory (RES) representing the explicitly shared
anonymous shm*/mmap pages.
.TP 4
23.\fB RUID \*(Em Real User Id \fR
25.\fB RUID \*(Em Real User Id \fR
The\fI real\fR user ID.
.TP 4
24.\fB RUSER \*(Em Real User Name \fR
26.\fB RUSER \*(Em Real User Name \fR
The\fI real\fR user name.
.TP 4
25.\fB S \*(Em Process Status \fR
27.\fB S \*(Em Process Status \fR
The status of the task which can be one of:
\fBD\fR = uninterruptible sleep
\fBR\fR = running
@@ -837,7 +849,7 @@ Even without a true SMP machine, you may see numerous tasks in this state
depending on \*(We's delay interval and nice value.
.TP 4
26.\fB SHR \*(Em Shared Memory Size (KiB) \fR
28.\fB SHR \*(Em Shared Memory Size (KiB) \fR
A subset of resident memory (RES) that may be used by other processes.
It will include shared anonymous pages and shared file-backed pages.
It also includes private pages mapped to files representing
@@ -846,7 +858,7 @@ program images and shared libraries.
\*(XX.
.TP 4
27.\fB SID \*(Em Session Id \fR
29.\fB SID \*(Em Session Id \fR
A session is a collection of process groups (\*(Xa PGRP),
usually established by the login shell.
A newly forked process joins the session of its creator.
@@ -855,11 +867,11 @@ member of the session, called the session leader, which is usually the
login shell.
.TP 4
28.\fB SUID \*(Em Saved User Id \fR
30.\fB SUID \*(Em Saved User Id \fR
The\fI saved\fR user ID.
.TP 4
29.\fB SUPGIDS \*(Em Supplementary Group IDs \fR
31.\fB SUPGIDS \*(Em Supplementary Group IDs \fR
The IDs of any supplementary group(s) established at login or
inherited from a task's parent.
They are displayed in a comma delimited list.
@@ -872,7 +884,7 @@ Even so, such variable width fields could still suffer truncation.
any truncated data.
.TP 4
30.\fB SUPGRPS \*(Em Supplementary Group Names \fR
32.\fB SUPGRPS \*(Em Supplementary Group Names \fR
The names of any supplementary group(s) established at login or
inherited from a task's parent.
They are displayed in a comma delimited list.
@@ -885,24 +897,24 @@ Even so, such variable width fields could still suffer truncation.
any truncated data.
.TP 4
31.\fB SUSER \*(Em Saved User Name \fR
33.\fB SUSER \*(Em Saved User Name \fR
The\fI saved\fR user name.
.TP 4
32.\fB SWAP \*(Em Swapped Size (KiB) \fR
34.\fB SWAP \*(Em Swapped Size (KiB) \fR
The formerly resident portion of a task's address space written
to the \*(MS when \*(MP becomes over committed.
\*(XX.
.TP 4
33.\fB TGID \*(Em Thread Group Id \fR
35.\fB TGID \*(Em Thread Group Id \fR
The ID of the thread group to which a task belongs.
It is the PID of the thread group leader.
In kernel terms, it represents those tasks that share an mm_struct.
.TP 4
34.\fB TIME \*(Em \*(PU Time \fR
36.\fB TIME \*(Em \*(PU Time \fR
Total \*(PU time the task has used since it started.
When Cumulative mode is \*O, each process is listed with the \*(Pu
time that it and its dead children have used.
@@ -910,19 +922,19 @@ You toggle Cumulative mode with `S', which is both a \*(CO and an \*(CI.
\*(XC `S' \*(CI for additional information regarding this mode.
.TP 4
35.\fB TIME+ \*(Em \*(PU Time, hundredths \fR
37.\fB TIME+ \*(Em \*(PU Time, hundredths \fR
The same as TIME, but reflecting more granularity through hundredths
of a second.
.TP 4
36.\fB TPGID \*(Em Tty Process Group Id \fR
38.\fB TPGID \*(Em Tty Process Group Id \fR
The process group ID of the foreground process for the connected tty,
or \-1 if a process is not connected to a terminal.
By convention, this value equals the process ID (\*(Xa PID) of the
process group leader (\*(Xa PGRP).
.TP 4
37.\fB TTY \*(Em Controlling Tty \fR
39.\fB TTY \*(Em Controlling Tty \fR
The name of the controlling terminal.
This is usually the device (serial port, pty, etc.) from which the
process was started, and which it uses for input or output.
@@ -930,22 +942,22 @@ However, a task need not be associated with a terminal, in which case
you'll see `?' displayed.
.TP 4
38.\fB UID \*(Em User Id \fR
40.\fB UID \*(Em User Id \fR
The\fI effective\fR user ID of the task's owner.
.TP 4
39.\fB USED \*(Em Memory in Use (KiB) \fR
41.\fB USED \*(Em Memory in Use (KiB) \fR
This field represents the non-swapped \*(MP a task is using (RES) plus
the swapped out portion of its address space (SWAP).
\*(XX.
.TP 4
40.\fB USER \*(Em User Name \fR
42.\fB USER \*(Em User Name \fR
The\fI effective\fR user name of the task's owner.
.TP 4
41.\fB VIRT \*(Em Virtual Memory Size (KiB) \fR
43.\fB VIRT \*(Em Virtual Memory Size (KiB) \fR
The total amount of \*(MV used by the task.
It includes all code, data and shared libraries plus pages that have been
swapped out and pages that have been mapped but not used.
@@ -953,20 +965,20 @@ swapped out and pages that have been mapped but not used.
\*(XX.
.TP 4
42.\fB WCHAN \*(Em Sleeping in Function \fR
44.\fB WCHAN \*(Em Sleeping in Function \fR
This field will show the name of the kernel function in which the task
is currently sleeping.
Running tasks will display a dash (`\-') in this column.
.TP 4
43.\fB nDRT \*(Em Dirty Pages Count \fR
45.\fB nDRT \*(Em Dirty Pages Count \fR
The number of pages that have been modified since they were last
written to \*(AS.
Dirty pages must be written to \*(AS before the corresponding physical
memory location can be used for some other virtual page.
.TP 4
44.\fB nMaj \*(Em Major Page Fault Count \fR
46.\fB nMaj \*(Em Major Page Fault Count \fR
The number of\fB major\fR page faults that have occurred for a task.
A page fault occurs when a process attempts to read from or write to a
virtual page that is not currently present in its address space.
@@ -974,7 +986,7 @@ A major page fault is when \*(AS access is involved in making that
page available.
.TP 4
45.\fB nMin \*(Em Minor Page Fault count \fR
47.\fB nMin \*(Em Minor Page Fault count \fR
The number of\fB minor\fR page faults that have occurred for a task.
A page fault occurs when a process attempts to read from or write to a
virtual page that is not currently present in its address space.
@@ -982,50 +994,50 @@ A minor page fault does not involve \*(AS access in making that
page available.
.TP 4
46.\fB nTH \*(Em Number of Threads \fR
48.\fB nTH \*(Em Number of Threads \fR
The number of threads associated with a process.
.TP 4
47.\fB nsIPC \*(Em IPC namespace \fR
49.\fB nsIPC \*(Em IPC namespace \fR
The Inode of the namespace used to isolate interprocess communication (IPC)
resources such as System V IPC objects and POSIX message queues.
.TP 4
48.\fB nsMNT \*(Em MNT namespace \fR
50.\fB nsMNT \*(Em MNT namespace \fR
The Inode of the namespace used to isolate filesystem mount points thus
offering different views of the filesystem hierarchy.
.TP 4
49.\fB nsNET \*(Em NET namespace \fR
51.\fB nsNET \*(Em NET namespace \fR
The Inode of the namespace used to isolate resources such as network devices,
IP addresses, IP routing, port numbers, etc.
.TP 4
50.\fB nsPID \*(Em PID namespace \fR
52.\fB nsPID \*(Em PID namespace \fR
The Inode of the namespace used to isolate process ID numbers
meaning they need not remain unique.
Thus, each such namespace could have its own `init/systemd' (PID #1) to
manage various initialization tasks and reap orphaned child processes.
.TP 4
51.\fB nsUSER \*(Em USER namespace \fR
53.\fB nsUSER \*(Em USER namespace \fR
The Inode of the namespace used to isolate the user and group ID numbers.
Thus, a process could have a normal unprivileged user ID outside a user
namespace while having a user ID of 0, with full root privileges, inside
that namespace.
.TP 4
52.\fB nsUTS \*(Em UTS namespace \fR
54.\fB nsUTS \*(Em UTS namespace \fR
The Inode of the namespace used to isolate hostname and NIS domain name.
UTS simply means "UNIX Time-sharing System".
.TP 4
53.\fB vMj \*(Em Major Page Fault Count Delta\fR
55.\fB vMj \*(Em Major Page Fault Count Delta\fR
The number of\fB major\fR page faults that have occurred since the
last update (see nMaj).
.TP 4
54.\fB vMn \*(Em Minor Page Fault Count Delta\fR
56.\fB vMn \*(Em Minor Page Fault Count Delta\fR
The number of\fB minor\fR page faults that have occurred since the
last update (see nMin).