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

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Message-ID: <20190218125552-mutt-send-email-mst@kernel.org>
Date:   Mon, 18 Feb 2019 13:01:41 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Nitesh Narayan Lal <nitesh@...hat.com>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.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>, dodgen@...gle.com,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        dhildenb@...hat.com, Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC][Patch v8 0/7] KVM: Guest Free Page Hinting

On Mon, Feb 18, 2019 at 09:31:13AM -0800, Alexander Duyck wrote:
> > Optimization of space comes with a price (here: execution time).
> 
> One thing to keep in mind though is that if you are already having to
> pull pages in and out of swap on the host in order be able to provide
> enough memory for the guests the free page hinting should be a
> significant win in terms of performance.

Absolutely and I think that's the point of the hinting right?
To cut out swap/IO on the host.

-- 
MST