linux-kernel - Re: kernel processes - are they really needed?

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Message-ID: <20071031160142.GC28809@atrey.karlin.mff.cuni.cz>
Date:	Wed, 31 Oct 2007 17:01:42 +0100
From:	Jan Kara <jack@...e.cz>
To:	Ram <vshrirama@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: kernel processes - are they really needed?

  Hi,

>     When i do ps -l. i see the following processes which are obviously
> started by kernel.
> 
>    Could any one tell me what each of these processes do and can
> anyone of them can be removed.?
  I'll write what I know :)

> PID  Uid     VmSize Stat Command
>     1 root        584 S   init
>     2 root            SWN [ksoftirqd/0]
>     3 root            SW  [watchdog/0]
>     4 root            SW< [events/0]
>     5 root            SW< [khelper]
>     6 root            SW< [kthread]
>    23 root            SW< [kblockd/0]
  This one has something to do with block layer - like unplugging
request queue after a certain timeout etc.

>    38 root            SW  [pdflush]
>    39 root            SW  [pdflush]
  Doing writeback of dirty data.

>    40 root            SW< [kswapd0]
  Swapping pages in and out.

>    41 root            SW< [aio/0]
  Kernel thread handling asynchronous IO.

>    85 root            SW  [mtdblockd]
>   116 root            SWN [jffs2_gcd_mtd9]
  jffs2 specific - ask a maintainer :) (and mtdblockd has something to
do with MTD devices so he may know that one as well).

								Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
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