Re: [PATCH] hibernate / memory hotplug: always use for_each_populated_zone()

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Wed, 22 Jul 2009 19:49:55 +0200
"Rafael J. Wysocki" <rjw@sisk.pl> wrote:

> > and enough simple. But this may allow you to access remapped device's memory...
> > Then, some range check will be required anyway.
> > Can we detect io-remapped range from memmap or any ?
> > (I think we'll have to skip PG_reserved page...)
> > 
> > > > Alternative is making use of walk_memory_resource() as memory hotplug does.
> > > > It checks resource information registered.
> > > 
> > > I'd be fine with any _simple_ mechanism allowing us to check whether there's
> > > a physical page frame for given page (or given PFN).
> > > 
> > 
> > walk_memory_resource() is enough _simple_,  IMHO.
> > Now, I'm removing #ifdef CONFIG_MEMORY_HOTPLUG for walk_memory_resource() to
> > rewrite /proc/kcore. 
> 
> Hmm.  Which architectures set CONFIG_ARCH_HAS_WALK_MEMORY ?
> 

ppc only. It has its own.

I'm now prepareing a patch to remove #ifdef CONFIG_MEMORY_HOTPLUG for /proc/kcore
and rename it to walk_system_ram_range(). plz see "kcore:...." patches currently
posted to lkml if you are interested in.

Thanks,
-Kame

Thanks,
-Kame


> Best,
> Rafael

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