linux-kernel - RE: [RFC][Patch v8 0/7] KVM: Guest Free Page Hinting

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Message-ID: <286AC319A985734F985F78AFA26841F73DF6F0E3@shsmsx102.ccr.corp.intel.com>
Date:   Thu, 14 Feb 2019 08:48:59 +0000
From:   "Wang, Wei W" <wei.w.wang@...el.com>
To:     'Nitesh Narayan Lal' <nitesh@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "lcapitulino@...hat.com" <lcapitulino@...hat.com>,
        "pagupta@...hat.com" <pagupta@...hat.com>,
        "yang.zhang.wz@...il.com" <yang.zhang.wz@...il.com>,
        "riel@...riel.com" <riel@...riel.com>,
        "david@...hat.com" <david@...hat.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "dodgen@...gle.com" <dodgen@...gle.com>,
        "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
        "dhildenb@...hat.com" <dhildenb@...hat.com>,
        "aarcange@...hat.com" <aarcange@...hat.com>
Subject: RE: [RFC][Patch v8 0/7] KVM: Guest Free Page Hinting

On Wednesday, February 13, 2019 8:07 PM, Nitesh Narayan Lal wrote:
> Once the host free the pages. All the isolated pages are returned back 
> to the buddy. (This is implemented in hyperlist_ready())

This actually has the same issue: the isolated pages have to wait to return to the buddy
after the host has done with madvise(DONTNEED). Otherwise, a page could be used by
a guest thread and the next moment the host takes it to other host threads.

Best,
Wei