From: "Hua Zhong" <hzhong@gmail.com>
To: "'Jan Engelhardt'" <jengelh@linux01.gwdg.de>,
"'Mikado'" <mikado4vn@gmail.com>
Cc: "'linux-os \(Dick Johnson\)'" <linux-os@analogic.com>,
"'Linux kernel'" <linux-kernel@vger.kernel.org>
Subject: RE: Which process is associated with process ID 0 (swapper)
Date: Thu, 20 Apr 2006 15:15:15 -0700 [thread overview]
Message-ID: <004801c664c7$e80acfd0$853d010a@nuitysystems.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0604210007140.28841@yvahk01.tjqt.qr>
> >Linux really has swapper process ;)
> >
> To be precise, it has more than one.
>
> When you hit an OOPS, the trace [1] might show:
> "Pid: 0, comm: swapper Not tainted 2.6.11.6"
>
> Plus you see one of these per CPU [ps aufwwx]:
> root 106 0.0 0.0 0 0 ? S Apr20
> 0:04 [kswapd0]
>
> So, a question to the public: what swapper swaps, and what's
> swapper(as in pid 0) in oops, if there's no PID 0?
Swapper is the idle process, which swaps nothing. Its name is historic and it doesn't appear in /proc because for_each_process()
skips it.
Kswapd is totally different.
next prev parent reply other threads:[~2006-04-20 22:15 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-20 14:58 Which process is associated with process ID 0 (swapper) Mikado
2006-04-20 15:30 ` linux-os (Dick Johnson)
2006-04-20 15:48 ` Mike Galbraith
2006-04-20 16:04 ` Mikado
2006-04-20 16:39 ` Joshua Hudson
2006-04-20 22:10 ` Jan Engelhardt
2006-04-20 22:15 ` Hua Zhong [this message]
2006-04-20 22:19 ` Jan Engelhardt
2006-04-20 23:12 ` Mikado
2006-04-21 12:46 ` Jan Engelhardt
2006-04-20 23:19 ` Mikado
2006-04-20 23:35 ` Mikado
2006-04-21 0:37 ` Patrick McHardy
2006-04-21 1:33 ` Mikado
2006-04-21 3:16 ` Bernd Eckenfels
2006-04-21 12:48 ` Jan Engelhardt
2006-04-21 12:52 ` Jan Engelhardt
2006-04-21 15:21 ` Mikado
2006-04-20 22:06 ` Jan Engelhardt
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