linux-kernel - Re: [PATCH v13 4/5] mm: support reporting free page blocks

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Message-ID: <20170804075337.GC26029@dhcp22.suse.cz>
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