linux-kernel - Re: speeding up swapoff

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Message-Id: <200708291818.44089.oliver@neukum.org>
Date:	Wed, 29 Aug 2007 18:18:42 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Daniel Drake <ddrake@...ntes3d.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: speeding up swapoff

Am Mittwoch 29 August 2007 schrieb Hugh Dickins:
> On Wed, 29 Aug 2007, Oliver Neukum wrote:
> > Am Mittwoch 29 August 2007 schrieb Arjan van de Ven:
> > > Another question, if this is during system shutdown, maybe that's a
> > > valid case for flushing most of the pagecache first (from userspace)
> > > since most of what's there won't be used again anyway. If that's enough
> > > to make this go faster...
> > 
> > Is there a good reason to swapoff during shutdown?
> 
> Three reasons, I think, only one of them compelling:
> 
> 1. Tidiness.
> 2. So swapoff gets testing and I get to hear of any bugs in it.
> 3. If a regular swapfile is used instead of a disk partition, you
>    need to swapoff before its filesystem can be unmounted cleanly.

Yes. I hadn't thought of that. I am using a dedicated disk.

	Regards
		Oliver

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