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Date:      Wed, 10 Jan 2001 12:10:52 -0800 (PST)
From:      "Jeremy C. Reed" <reed@reedmedia.net>
To:        freebsd-hackers@freebsd.org
Subject:   what is swapper?
Message-ID:  <Pine.LNX.4.21.0101101159050.22051-100000@pilchuck.reedmedia.net>

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I am working on a non-technical, generic BSD article about special system
processes. I am trying to figure out some details about swapper (process
0) -- and I have a few questions.

I understand that the "swapper process swaps in runnable processes that
are currently swapped out, if there is room." Does anyone have an example
or an easy-to-understand description?

What is a frame? How is it related to swapper?

What is a PCB (pcb)? How is is it related to swapper?

Why is process 0 (zero) also called the "scheduler"? Is this the same as
the swapper?

What does "uao" (maybe "? anonymous object") mean? How is this related
to the swapper (or pagedaemon)?

On a related note, are there any special system processes other than the
swapper, pagedaemon, reaper and ioflush?

Where is this well documented?

Thanks,

   Jeremy C. Reed
   http://www.reedmedia.net/



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