Messages in this thread | | | Subject | Re: [patch 3/9] Guest page hinting: volatile page cache. | From | Martin Schwidefsky <> | Date | Fri, 01 Sep 2006 17:31:14 +0200 |
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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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