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Date: Fri, 4 Aug 2017 09:53:37 +0200 From: Michal Hocko <mhocko@...nel.org> To: "Michael S. Tsirkin" <mst@...hat.com> Cc: "Wang, Wei W" <wei.w.wang@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "virtualization@...ts.linux-foundation.org" <virtualization@...ts.linux-foundation.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "mawilcox@...rosoft.com" <mawilcox@...rosoft.com>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "virtio-dev@...ts.oasis-open.org" <virtio-dev@...ts.oasis-open.org>, "david@...hat.com" <david@...hat.com>, "cornelia.huck@...ibm.com" <cornelia.huck@...ibm.com>, "mgorman@...hsingularity.net" <mgorman@...hsingularity.net>, "aarcange@...hat.com" <aarcange@...hat.com>, "amit.shah@...hat.com" <amit.shah@...hat.com>, "pbonzini@...hat.com" <pbonzini@...hat.com>, "liliang.opensource@...il.com" <liliang.opensource@...il.com>, "yang.zhang.wz@...il.com" <yang.zhang.wz@...il.com>, "quan.xu@...yun.com" <quan.xu@...yun.com> Subject: Re: [PATCH v13 4/5] mm: support reporting free page blocks On Fri 04-08-17 00:02:01, Michael S. Tsirkin wrote: > On Thu, Aug 03, 2017 at 03:20:09PM +0000, Wang, Wei W wrote: > > On Thursday, August 3, 2017 9:51 PM, Michal Hocko: > > > As I've said earlier. Start simple optimize incrementally with some numbers to > > > justify a more subtle code. > > > -- > > > > OK. Let's start with the simple implementation as you suggested. > > > > Best, > > Wei > > The tricky part is when you need to drop the lock and > then restart because the device is busy. Would it maybe > make sense to rotate the list so that new head > will consist of pages not yet sent to device? No, I this should be strictly non-modifying API. -- Michal Hocko SUSE Labs
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