MFC r322139

Enhance top(1) to filter on multiple usernames

Reviewed by: cognet, bapt
Approved by: cognet
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D11840

MFC r315435:
Add ZFS compressed ARC stats to top(1)

MFC r316314:
top(1) read the wrong amount of data from sysctl

MFC r318448:
Explain the new fields in top(1) related to ZFS compressed ARC

Remove the laundry field during the merge, does not exist in stable/11

MFH (r305414): add a toggle to show approximate swap usage.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Silence top(1) compiler warnings

The contrib/top code is no longer maintained upstream (last pulled 16 years
ago). The K&R-style followed by the code spews -Wimplicit-int and -Wreturn-type
warnings, amongst others. This silences 131 warnings with as little modification
as possible by adding necessary return types, definitions, headers, and header
guards, and missing header includes.

The 5 warnings that remain are due to undeclared ncurses references. I didn't
include curses.h and term.h because there are several local functions and macros
that conflict with those definitions.

MFC after: 3 weeks
Reviewed by: cem, ngie
Submitted by: Randy Westlund <rwestlun@gmail.com>
Differential Revision: https://reviews.freebsd.org/D6468

Add -J command/flag to filter by jail name/jid. This will automatically
display the JID as well (the -j command/flag).

0 displays host.
+ displays all.

MFC after: 2 weeks
Relnotes: yes

Add a new line to top that provides a brief summary of the ZFS ARC memory
usage on hosts using ZFS. The new line displays the total amount of RAM
used by the ARC along with the size of MFU, MRU, anonymous (in flight),
headers, and other (miscellaneous) sub-categories. The line is not
displayed on systems that are not using ZFS.

Reviewed by: avg, fs@
MFC after: 3 days

Add a new option to toggle the display of the system idle process (per-CPU
idle threads). The process is displayed by default (subject to whether or
not system processes are displayed) to preserve existing behavior. The
system idle process can be hidden via the '-z' command line argument or the
'z' key while top is running. When it is hidden, top more closely matches
the behavior of FreeBSD <= 4.x where idle time was not accounted to any
process.

MFC after: 2 weeks

system_info.cpustates isn't sparse, so a bitmask of available CPU states
is redundant (I think it's a leftover from an older implementation).

Add a -P flag to display per-cpu cpu usage stats.

- s/jail id/jail ID/, acronyms should be in uppercase in general. Also,
it is written this way in jail(8).

Suggested by: brueffer
Approved by: delphij (mentor, implicit)

- Add a new 'j' switch and runtime option to toggle display jail id for
each process.
- While I'm here, keep help message sorted by keys

PR: 98489, 98975
Submitted by: clsung
Approved by: delphij (mentor)
MFC after: 2 weeks

Merge the CPU and WCPU columns in a single %6.2f column, add a new 'C'
command that toggles between the two and update the ORDER_PCTCPU()
macro to sort correctly by the visible "cpu" value.

This saves 6 more columns in 80-column terminals, making things a lot
better for the COMMAND column.

Tested on: i386, sparc64 (panther), amd64 (sledge)
Approved by: davidxu (in principle)

Changes to allow top to decide whether or not to show multiple threads per
process. Option -H enables it and it is toggled at the interactive
screen by 'H'.

Submitted by: Jung-uk Kim <jkim@niksun.com>

Resolve conflicts.

uptime display more in style with original code

Add -t option ('t' in interactive mode) to make top(1) ignore itself.
Attempts to contact the author of top(1) (William LeFebvre) have so
far been unsuccessful.

PR: 7253
Submitted by: Yours Truly

Apply the FreeBSD-local patches.

Obtained from: The ports collection.

This commit was generated by cvs2svn to compensate for changes in r24139,
which included commits to RCS files with non-trunk default branches.

This is the long-awaited import of top into the base system (actually,
the src/contrib/top part right now). This tools is simply too system-
dependant to maintain it in the ports collection.