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Date: Wed, 02 Apr 2008 15:13:05 -0700 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Dave Hansen <dave@...ux.vnet.ibm.com> CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Yasunori Goto <y-goto@...fujitsu.com>, Christoph Lameter <clameter@....com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Anthony Liguori <anthony@...emonkey.ws>, Mel Gorman <mel@....ul.ie> Subject: Re: [PATCH RFC] hotplug-memory: refactor online_pages to separate zone growth from page onlining Dave Hansen wrote: > On Wed, 2008-04-02 at 14:35 -0700, Jeremy Fitzhardinge wrote: > >> Dave Hansen wrote: >> >>> Oh, once we've let Linux establish ptes to it, we've required that the >>> hypervisor have it around? How does that work with the balloon driver? >>> Do we destroy the ptes when giving balloon memory back to the >>> hypervisor? >>> >> Yep. It removes any mapping before handing it back to the hypervisor. >> > > Wow. So does Xen ever use PSE to map kernel data? That sucks. > Not at present. But I'd like to change it to manage memory in largepage chunks so that we can. > Yeah, but I'm just talking about hotplugged memory. When we add it, we > don't have to map the added pages (since they're highmem) and don't have > to touch their contents and zero them out, either. Then, the balloon > driver can notice that the memory is too large, and start to balloon it > down. > I didn't think x86-64 had a notion of highmem. How do you prevent the pages from being used before they're ballooned out? >> Everything also applies to x86-64. >> > > Not really, though. We don't have the page->flags shortage or lack of > vmemmap on x86_64. Right now, I'd rather have a single mechanism that works for both. J -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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