linux-kernel - Re: Tmem [PATCH 0/5] (Take 3): Transcendent memory

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Message-ID: <20091225191848.GB8438@elf.ucw.cz>
Date:	Fri, 25 Dec 2009 20:18:49 +0100
From:	Pavel Machek <pavel@....cz>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	Nitin Gupta <ngupta@...are.org>, Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>, jeremy@...p.org,
	xen-devel@...ts.xensource.com, tmem-devel@....oracle.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	Rik van Riel <riel@...hat.com>, dave.mccracken@...cle.com,
	sunil.mushran@...cle.com, Avi Kivity <avi@...hat.com>,
	Schwidefsky <schwidefsky@...ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, chris.mason@...cle.com,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Tmem [PATCH 0/5] (Take 3): Transcendent memory

On Wed 2009-12-23 09:15:27, Dan Magenheimer wrote:
> > As I mentioned, I really like the idea behind tmem. All I am proposing
> > is that we should probably explore some alternatives to achive this using
> > some existing infrastructure in kernel.
> 
> Hi Nitin --
> 
> Sorry if I sounded overly negative... too busy around the holidays.
> 
> I'm definitely OK with exploring alternatives.  I just think that
> existing kernel mechanisms are very firmly rooted in the notion
> that either the kernel owns the memory/cache or an asynchronous
> device owns it.  Tmem falls somewhere in between and is very

Well... compcache seems to be very similar to preswap: in preswap case
you don't know if hypervisor will have space, in ramzswap you don't
know if data are compressible.

									Pavel

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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