linux-kernel - Unneeded kernel threads (xfs, jfs, gfs2)

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Date:	Tue, 13 May 2008 01:55:02 +0300
From:	Georgi Chorbadzhiyski <gf@...xsol.org>
To:	xfs@....sgi.com, jfs-discussion@...ts.sourceforge.net,
	cluster-devel@...hat.com
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Unneeded kernel threads (xfs, jfs, gfs2)

Hi guys, I know that not all kernel thread users are converted to
start only when needed but the following is little annoying specially
when I'm not even using jfs, xfs and gfs2.

Look at the ps output from a standard distro 2.6.24.5 kernel after a
fresh boot:

>   PID TTY      STAT   TIME COMMAND
>     2 ?        S<     0:00 [kthreadd]
>     3 ?        S<     0:00  \_ [migration/0]
>     4 ?        S<     0:00  \_ [ksoftirqd/0]
>     5 ?        S<     0:00  \_ [migration/1]
>     6 ?        S<     0:00  \_ [ksoftirqd/1]
>     7 ?        S<     0:00  \_ [events/0]
>     8 ?        S<     0:00  \_ [events/1]
>     9 ?        S<     0:00  \_ [khelper]
>   102 ?        S<     0:00  \_ [kblockd/0]
>   103 ?        S<     0:00  \_ [kblockd/1]
>   106 ?        S<     0:00  \_ [kacpid]
>   107 ?        S<     0:00  \_ [kacpi_notify]
>   230 ?        S<     0:00  \_ [ata/0]
>   231 ?        S<     0:00  \_ [ata/1]
>   232 ?        S<     0:00  \_ [ata_aux]
>   233 ?        S<     0:00  \_ [ksuspend_usbd]
>   239 ?        S<     0:00  \_ [khubd]
>   242 ?        S<     0:00  \_ [kseriod]
>   284 ?        S      0:00  \_ [pdflush]
>   285 ?        S      0:00  \_ [pdflush]
>   286 ?        S<     0:00  \_ [kswapd0]
>   326 ?        S<     0:00  \_ [aio/0]
>   327 ?        S<     0:00  \_ [aio/1]
>   349 ?        S<     0:00  \_ [jfsIO]
>   350 ?        S<     0:00  \_ [jfsCommit]
>   351 ?        S<     0:00  \_ [jfsCommit]
>   352 ?        S<     0:00  \_ [jfsSync]

Not needed here, because no jfs partition is in use.

>   354 ?        S<     0:00  \_ [xfslogd/0]
>   355 ?        S<     0:00  \_ [xfslogd/1]
>   356 ?        S<     0:00  \_ [xfsdatad/0]
>   357 ?        S<     0:00  \_ [xfsdatad/1]
>   361 ?        S<     0:00  \_ [xfs_mru_cache]

Not needed here, because no xfs partition is in use.

>   366 ?        S<     0:00  \_ [gfs2_scand]
>   367 ?        S<     0:00  \_ [glock_workqueue]
>   368 ?        S<     0:00  \_ [glock_workqueue]

I dont use gfs2

>  1047 ?        S<     0:00  \_ [scsi_tgtd/0]
>  1048 ?        S<     0:00  \_ [scsi_tgtd/1]
>  1118 ?        S<     0:00  \_ [scsi_eh_2]
>  1120 ?        S<     0:00  \_ [scsi_eh_3]
>  1122 ?        S<     0:00  \_ [scsi_eh_4]
>  1124 ?        S<     0:00  \_ [scsi_eh_5]
>  1133 ?        S<     0:00  \_ [exec-osm/0]
>  1134 ?        S<     0:00  \_ [exec-osm/1]
>  1140 ?        S<     0:00  \_ [block-osm/0]
>  1141 ?        S<     0:00  \_ [block-osm/1]

What is osm? Can't find anything in kernel config?

>  1148 ?        S<     0:00  \_ [khpsbpkt]

What is this?

>  1193 ?        S<     0:00  \_ [ksnapd]
>  1201 ?        S<     0:00  \_ [rpciod/0]
>  1202 ?        S<     0:00  \_ [rpciod/1]
>  1204 ?        S<     0:00  \_ [kjournald]
>  2448 ?        S<     0:00  \_ [kjournald]
>  2649 ?        S      0:00  \_ [lockd]

Kernel config can be found here:
  http://mirrors.unixsol.org/slackware/slackware-12.1/kernels/hugesmp.s/config

-- 
Georgi Chorbadzhiyski
http://georgi.unixsol.org/
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