lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 1 Apr 2019 10:45:21 -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 04:09:32PM +0200, David Hildenbrand wrote: > > > > When you say yield, I would guess that would involve config space access > > to the balloon to flush out outstanding hints? > > I rather meant yield your CPU to the hypervisor, so it can process > hinting requests faster (like waiting for a spinlock). This is the > simple case. More involved approaches might somehow indicate to the > hypervisor to not process queued requests but simply return them to the > guest so the guest can add the isolated pages to the buddy. If this is > "config space access to the balloon to flush out outstanding hints" then > yes, something like that might be a good idea if it doesn't harm > performance. The problem would be in testing this unfortunately. Same as any OOM hack, it is difficult to test well. > -- > > Thanks, > > David / dhildenb
Powered by blists - more mailing lists