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Date: Mon, 1 Apr 2019 10:47:56 -0400 From: "Michael S. Tsirkin" <mst@...hat.com> To: David Hildenbrand <david@...hat.com> Cc: Nitesh Narayan Lal <nitesh@...hat.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, pbonzini@...hat.com, lcapitulino@...hat.com, pagupta@...hat.com, wei.w.wang@...el.com, yang.zhang.wz@...il.com, riel@...riel.com, dodgen@...gle.com, konrad.wilk@...cle.com, dhildenb@...hat.com, aarcange@...hat.com, alexander.duyck@...il.com Subject: Re: On guest free page hinting and OOM On Mon, Apr 01, 2019 at 04:11:42PM +0200, David Hildenbrand wrote: > > The interesting thing is most probably: Will the hinting size usually be > > reasonable small? At least I guess a guest with 4TB of RAM will not > > suddenly get a hinting size of hundreds of GB. Most probably also only > > something in the range of 1GB. But this is an interesting question to > > look into. > > > > Also, if the admin does not care about performance implications when > > already close to hinting, no need to add the additional 1Gb to the ram size. > > "close to OOM" is what I meant. Problem is, host admin is the one adding memory. Guest admin is the one that knows about performance. > > -- > > Thanks, > > David / dhildenb
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