linux-kernel - Re: [patch 3/9] Guest page hinting: volatile page cache.

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Message-Id: <1157124674.21733.13.camel@localhost>
Date:	Fri, 01 Sep 2006 17:31:14 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	akpm@...l.org, nickpiggin@...oo.com.au, frankeh@...son.ibm.com,
	rhim@...gateh.edu, Andy Whitcroft <apw@...dowen.org>
Subject: Re: [patch 3/9] Guest page hinting: volatile page cache.

On Fri, 2006-09-01 at 07:57 -0700, Dave Hansen wrote:
> > +#define PG_state_change                21      /* HV page state is changing. */
> > +#define PG_discarded           22      /* HV page has been discarded. */ 
> 
> We're already desperately short on page flags on 32-bit architectures.
> It seems a wee bit silly to add two arch-generic flags for what is a
> very specialized arch-specific feature at this point.

There are even three additional page flags if you apply the full set of
patches.

> I know that there are 32-bit s390 kernels, but would this be a
> reasonable feature to restrict to only 64-bit kernels?  That might be a
> decent compromise.

Yes, it is definitly an option to make this a 64-bit only features. In
particular because the ESSA instruction that is used on s390 is only
available in zarch mode (=64 bit).

-- 
blue skies,
  Martin.

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH

"Reality continues to ruin my life." - Calvin.


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