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- Describe all system threads.

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- Mention all MI threads that are not device specific; i.e. mention scsibus,
usb, raidframe, nfs, but not pms.
This commit is contained in:
christos 2004-01-07 16:26:23 +00:00
parent 2251734558
commit 46f02625cb
1 changed files with 54 additions and 10 deletions
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64
lib/libc/sys/intro.2
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@ -1,4 +1,4 @@
.\" $NetBSD: intro.2,v 1.36 2003/11/25 15:33:58 kleink Exp $
.\" $NetBSD: intro.2,v 1.37 2004/01/07 16:26:23 christos Exp $
.\"
.\" Copyright (c) 1980, 1983, 1986, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
@ -590,21 +590,65 @@ A process is recognized as a
.Em super-user
process and is granted special privileges if its effective user ID is 0.
.It Special Processes
The processes with process IDs of 0, 1, 2, 3, and 4 are special.
The processes with process IDs of 0 and 1 are special.
Process 0 is the scheduler.
Process 1 is the initialization process
.Xr init 8 ,
and is the ancestor (parent) of every other process in the system.
It is used to control the process structure.
Process 2 is the paging daemon.
Process 3 is the
.Sy reaper ,
which handles deallocating resources for exiting processes.
Process 4 is
.Sy ioflush ,
which replaces the old
The kernel will allocate other kernel threads to handle certain
periodic tasks or device related tasks, such as:
.Bl -tag -width pagedaemon
.It Sy acctwatch
System accounting disk watcher, see
.Xr acct 2 ,
.Xr acct 4 .
.It Sy aiodoned
Asynchronous I/O done handler, see
.Xr uvm 9 .
.It Sy atabusX
ATA bus handler, see
.Xr ata 4 .
.It Sy cardslotX
Cardbus slot watcher thread, see
.Xr cardslot 4 .
.It Sy cryptoret
The software crypto daemon.
.It Sy fssbsX
File system snapshot thread, see
.Xr fss 4 .
.It Sy ioflush
The in-kernel periodic flush the buffer cache to disk task,
which replaces the old
.Sy update
program that periodically flushes the disk buffer cache.
program.
.It Sy nfsio, nfskqpoll
NFS handing daemons.
.It Sy lfs_writer
Log filesystem writer.
.It Sy pagedaemon
The page daemon.
.It Sy raidX, raidioX, raid_parity, raid_recon, raid_reconip, raid_copyback
Raid framework related threads, see
.Xr raid 4 .
.It Sy scsibusX
SCSI bus handler, see
.Xr scsi 4 .
.It Sy smbiodX, smbkq
SMBFS handling daemon, see
.Xr netsmb 4 .
.It Sy swdmover
The software data mover I/O thread, see
.Xr dmoverio 4 .
.It Sy sysmon
The systems monitoring framework daemon.
.It Sy usbX, usbtask
USB bus handler, see
.Xr usb 4 .
.El
.Pp
There are more machine-dependent kernel threads allocated by different drivers.
See the specific driver manual pages for more information.
.It Descriptor
An integer assigned by the system when a file is referenced
by