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Date:   Wed, 6 Mar 2019 10:43:26 -0800
From:   Alexander Duyck <>
To:     Nitesh Narayan Lal <>
Cc:     "Michael S. Tsirkin" <>,
        kvm list <>,
        LKML <>,
        linux-mm <>,
        Paolo Bonzini <>,,,,
        Yang Zhang <>,
        Rik van Riel <>,
        David Hildenbrand <>,,
        Konrad Rzeszutek Wilk <>,, Andrea Arcangeli <>
Subject: Re: [RFC][Patch v9 0/6] KVM: Guest Free Page Hinting

On Wed, Mar 6, 2019 at 10:41 AM Nitesh Narayan Lal <> wrote:
> On 3/6/19 1:38 PM, Michael S. Tsirkin wrote:
> > On Wed, Mar 06, 2019 at 01:30:14PM -0500, Nitesh Narayan Lal wrote:
> >>> Want to try testing Alex's patches for comparison?
> >> Somehow I am not in a favor of doing a hypercall on every page (with
> >> huge TLB order/MAX_ORDER -1) as I think it will be costly.
> >> I can try using Alex's host side logic instead of virtio.
> >> Let me know what you think?
> > I am just saying maybe your setup is misconfigured
> > that's why you see no speedup.
> Got it.
> > If you try Alex's
> > patches and *don't* see speedup like he does, then
> > he might be able to help you figure out why.
> > OTOH if you do then *you* can try figuring out why
> > don't your patches help.
> Yeap, I can do that.
> Thanks.

If I can get your patches up and running I can probably try the same
test I did to see if I am able to reproduce the behavior. It may take
a bit though as I am running into several merge conflicts that I am
having to sort out.


- Alex

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