linux-kernel - Re: speeding up swapoff

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Message-ID: <Pine.LNX.4.64.0708291701140.617@blonde.wat.veritas.com>
Date:	Wed, 29 Aug 2007 17:04:26 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Oliver Neukum <oliver@...kum.org>
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

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.

Hugh
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