Re: [PATCH 2 of 4] hotplug-memory: adding non-section-alignedmemory is bad

[KAMEZAWA Hiroyuki]

On Thu, 27 Mar 2008 21:20:18 -0700
Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
> > How about capturing online_page() by balloon ?
> >   
> 
> You're saying that using online_page() on each page on its own is not 
> sufficient?
> 
online_page() just remove PG_reserved flags and free it. 
Not dealing with global data, like total pages, zonelist, etc.

> > ex.)
> > ==
> > call add_memory() to create mem_map
> > call online_pages() against the whole section. <=== call this without sysfs.
> >      online_pages() do misc. jobs
> >         call online_page() one by one (arch dependent) called by walk_memory_resource.
> >             online_page() will finally call free_page(page).
> >             <=========== Xen capture here.
> >             Don't free onlined page and swallow them into baloon driver.
> > ==
> >   
> 
> I'm not sure what you mean by "capture" here.  Do you mean a hook?  I'd 
> rather not have to put some Xen-specific hook in here.
> 
ok.

> What would happen if I did online_pages(pfn, 1) on each page as I 
> populate it?
> 
I think (hope) it works well. But it seems no one tries to do that.

Thanks,
-Kame



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