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

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Message-ID: <CAKgT0UfC0E6_ZSs5zvkTsH+2LdQuL7fWHqNJQtz+j7BThx5FDA@mail.gmail.com>
Date:   Wed, 6 Mar 2019 10:43:26 -0800
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     Nitesh Narayan Lal <nitesh@...hat.com>
Cc:     "Michael S. Tsirkin" <mst@...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 6, 2019 at 10:41 AM Nitesh Narayan Lal <nitesh@...hat.com> 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.

Thanks.

- Alex