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

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Message-ID: <20170804000043-mutt-send-email-mst@kernel.org>
Date:   Fri, 4 Aug 2017 00:02:01 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     "Wang, Wei W" <wei.w.wang@...el.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        "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 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?

-- 
MST