linux-kernel - Re: [PATCH] Add a page cache-backed balloon device driver.

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Message-ID: <CAGTjWtAyoqDS9vAc1HShBLfsdfuBy4-Aev+_Rn-f0H2V2C1PTg@mail.gmail.com>
Date:	Tue, 30 Oct 2012 09:25:49 -0700
From:	Mike Waychison <mikew@...gle.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Frank Swiderski <fes@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kvm@...r.kernel.org
Subject: Re: [PATCH] Add a page cache-backed balloon device driver.

On Tue, Oct 30, 2012 at 8:29 AM, Michael S. Tsirkin <mst@...hat.com> wrote:
> On Tue, Sep 11, 2012 at 12:10:18AM +0300, Michael S. Tsirkin wrote:
>> > On the plus side, having an exit taken here on each page turns out to
>> > be relatively cheap, as the vmexit from the page fault should be
>> > faster to process as it is fully handled within the host kernel.
>> >
>> > Perhaps some combination of both methods is required? I'm not sure :\
>>
>> Perhaps some benchmarking is in order :)
>> Can you try telling host, potentially MADV_WILL_NEED
>> in that case like qemu does, then run your proprietary test
>> and see if things work well enough?
>
> Ping. Had a chance to try that?

Not yet.  We've been focused on other things recently and probably
won't have a chance to return to this for a couple months at best.
Sorry :(
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