Date: Wed, 29 Aug 2007 17:04:26 +0100 (BST)
From: Hugh Dickins <hugh@veritas.com>
To: Oliver Neukum <oliver@neukum.org>
cc: Arjan van de Ven <arjan@infradead.org>,
       Daniel Drake <ddrake@brontes3d.com>, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org
Subject: Re: speeding up swapoff
In-Reply-To: <200708291636.48323.oliver@neukum.org>
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 <200708291636.48323.oliver@neukum.org>
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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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