linux-kernel - RE: Swap on Fuse deadlocks?

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Message-ID: <MDEHLPKNGKAHNMBLJOLKMEIEOKAB.davids@webmaster.com>
Date:	Mon, 25 Sep 2006 17:08:13 -0700
From:	"David Schwartz" <davids@...master.com>
To:	<linux-kernel@...r.kernel.org>
Subject: RE: Swap on Fuse deadlocks?

> Swap on disk I don't get.  A little slow perhaps due to the LZO or zlib
> compression in the middle (lzolayer lets you pick either); but a total
> freeze?  What's wrong here, is lzo_fs data getting swapped out and then
> not swapped in because it's needed to decompress itself?

The filesystem would have to make sure to lock in memory itself and any code it might need. Obviously, if the filesystem code itself gets swapped out, you cannot swap it back in again ever. Any user-space filesystem that expects to handle swap had better call 'mlock'.

DS

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