[Bug 254723] [patch] systat -swap to display per-process swap space usage ordered by highest

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254723

--- Comment #3 from ota at j.email.ne.jp ---
(In reply to Andriy Gapon from comment #2)

We can consider adding to top as well if such demand is popular

When I'm interested in swap in/out activities, I'd like to see each of swap
device usages and also disk I/O activities.  systat -swap shows both and had
spaces in the middle.  It was more attractive place to add.  I have been adding
extra displays to systat over years and familiar than top.

I had to access all vm page usage via libprocstat to calculate swap usage for
each process. Top uses kinfo_proc.  We will need to query libprocstat for every
process and I wonder how much it weight it adds to top.  I think we can do that
only when -w is passed, though.

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