Subject: Re: [XEN] using shmfs for swapspace
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       xen-devel@lists.sourceforge.net
In-Reply-To: <20050103205318.GD6631@lkcl.net>
References: <20050102162652.GA12268@lkcl.net>
	 <20050103183133.GA19081@samarkand.rivenstone.net>
	 <20050103205318.GD6631@lkcl.net>
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>  so this tends to suggest a strategy where you allocate as
>  much memory as you can afford to the DOM0 VM, and as little
>  as you can afford to the guests, and make the guest swap
>  files bigger to compensate.

This is essentially what the mainframe folks are already doing and have
been doing for some time because the kernel VM has no external inputs
for saying "you are virtualised so be nice" 
for doing opportunistic page recycling ("I dont need this page but when
I ask for it back please tell me if you trashed the content") and for
hinting to the underlying VM what pages are best blasted out of
existance first and how to communicate so we dont page them back in
scanning them.


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