linux-kernel - Re: [RFC][Patch v9 0/6] KVM: Guest Free Page Hinting

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Message-ID: <20190307134455-mutt-send-email-mst@kernel.org>
Date:   Thu, 7 Mar 2019 13:46:16 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     Nitesh Narayan Lal <nitesh@...hat.com>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Paolo Bonzini <pbonzini@...hat.com>, lcapitulino@...hat.com,
        pagupta@...hat.com, wei.w.wang@...el.com,
        Yang Zhang <yang.zhang.wz@...il.com>,
        Rik van Riel <riel@...riel.com>,
        David Hildenbrand <david@...hat.com>, dodgen@...gle.com,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        dhildenb@...hat.com, Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC][Patch v9 0/6] KVM: Guest Free Page Hinting

On Wed, Mar 06, 2019 at 10:00:05AM -0800, Alexander Duyck wrote:
> I have been thinking about this. Instead of stealing the page couldn't
> you simply flag it that there is a hint in progress and simply wait in
> arch_alloc_page until the hint has been processed? The problem is in
> stealing pages you are going to introduce false OOM issues when the
> memory isn't available because it is being hinted on.

Can we not give them back in an OOM notifier?

-- 
MST