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

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Message-ID: <20121030152925.GA7023@redhat.com>
Date:	Tue, 30 Oct 2012 17:29:25 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Mike Waychison <mikew@...gle.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, 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?

-- 
MST
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