lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Wed, 08 Jul 2009 21:20:12 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Anthony Liguori <anthony@...emonkey.ws>
CC:	Dan Magenheimer <dan.magenheimer@...cle.com>,
	linux-kernel@...r.kernel.org, npiggin@...e.de, akpm@...l.org,
	jeremy@...p.org, xen-devel@...ts.xensource.com,
	tmem-devel@....oracle.com, alan@...rguk.ukuu.org.uk,
	linux-mm@...ck.org, kurt.hackel@...cle.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	dave.mccracken@...cle.com, Marcelo Tosatti <mtosatti@...hat.com>,
	sunil.mushran@...cle.com, Avi Kivity <avi@...hat.com>,
	Schwidefsky <schwidefsky@...ibm.com>, chris.mason@...cle.com,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 0/4] (Take 2): transcendent memory ("tmem") for Linux

Anthony Liguori wrote:

> I have trouble mapping this to a VMM capable of overcommit without just 
> coming back to CMM2.

Same for me.  CMM2 has a more complex mechanism, but way
easier policy than anything else out there.

> In CMM2 parlance, ephemeral tmem pools is just normal kernel memory 
> marked in the volatile state, no?

Basically.

> It seems to me that an architecture built around hinting would be more 
> robust than having to use separate memory pools for this type of memory 
> (especially since you are requiring a copy to/from the pool).

I agree.  Something along the lines of CMM2 needs more
infrastructure, but will be infinitely easier to get right
from the policy side.

Automatic ballooning is an option too, with fairly simple
infrastructure, but potentially insanely complex policy
issues to sort out...

-- 
All rights reversed.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists