RE: [PATCH] xen: cleancache shim to Xen Transcendent Memory

[Dan Magenheimer <dan.magenheimer@oracle.com>]

> From: Ian Campbell [mailto:Ian.Campbell@citrix.com]
> Sent: Friday, April 15, 2011 4:02 PM
> Subject: Re: [PATCH] xen: cleancache shim to Xen Transcendent Memory
> 
> On Thu, 2011-04-14 at 14:20 -0700, Dan Magenheimer wrote:
> > [PATCH] xen: cleancache shim to Xen Transcendent Memory
> >
> > This patch provides a shim between the kernel-internal cleancache
> > API (see Documentation/mm/cleancache.txt) and the Xen Transcendent
> > Memory ABI (see http://oss.oracle.com/projects/tmem).
> 
> There's no need to build this into a kernel which doesn't have
> cleancache (or one of the other frontends), is there? I think there
> should be a Kconfig option (even if its not a user visible one) with
> the appropriate depends/selects.

Yes, you're right.  It should eventually depend on

CONFIG_CLEANCACHE || CONFIG_FRONTSWAP

though there's no sense merging this xen cleancache
shim at all unless/until Linus merges cleancache
(and hopefully later some evolution of frontswap).

And once cleancache (and/or frontswap) is merged,
there's very little reason NOT to enable one or
both on a Xen guest kernel.

Thanks,
Dan

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