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Date: Mon, 18 Feb 2019 11:49:53 -0500 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, 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 <alexander.duyck@...il.com> Subject: Re: [RFC][Patch v8 0/7] KVM: Guest Free Page Hinting On Sat, Feb 16, 2019 at 10:40:15AM +0100, David Hildenbrand wrote: > It would be worth a try. My feeling is that a synchronous report after > e.g. 512 frees should be acceptable, as it seems to be acceptable on > s390x. (basically always enabled, nobody complains). What slips under the radar on an arch like s390 might raise issues for a popular arch like x86. My fear would be if it's only a problem e.g. for realtime. Then you get a condition that's very hard to trigger and affects worst case latencies. But really what business has something that is supposedly an optimization blocking a VCPU? We are just freeing up lots of memory why is it a good idea to slow that process down? -- MST
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