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On 04.11.11 at 01:54, Andrew Morton [off-list ref] wrote:

On Thu, 03 Nov 2011 16:49:27 +0000 "Jan Beulich" [off-list ref] wrote:

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On 27.10.11 at 20:52, Dan Magenheimer [off-list ref] wrote:

Hi Linus --

Frontswap now has FOUR users: Two already merged in-tree (zcache
and Xen) and two still in development but in public git trees
(RAMster and KVM).  Frontswap is part 2 of 2 of the core kernel
changes required to support transcendent memory; part 1 was cleancache
which you merged at 3.0 (and which now has FIVE users).

Frontswap patches have been in linux-next since June 3 (with zero
changes since Sep 22).  First posted to lkml in June 2009, frontswap 
is now at version 11 and has incorporated feedback from a wide range
of kernel developers.  For a good overview, see
   http://lwn.net/Articles/454795.
If further rationale is needed, please see the end of this email
for more info.

SO... Please pull:

git://oss.oracle.com/git/djm/tmem.git #tmem

...
Linux kernel distros incorporating frontswap:
- Oracle UEK 2.6.39 Beta:
   http://oss.oracle.com/git/?p=linux-2.6-unbreakable-beta.git;a=summary 
- OpenSuSE since 11.2 (2009) [see mm/tmem-xen.c]
   http://kernel.opensuse.org/cgit/kernel/ 

I've been away so I am too far behind to read this entire
very long thread, but wanted to confirm that we've been
carrying an earlier version of this code as indicated above
and it would simplify our kernel maintenance if frontswap
got merged.  So please count me as supporting frontswap.

Are you able to tell use *why* you're carrying it, and what benefit it
is providing to your users?

Because we're supporting/using Xen, where this (within the general
tmem picture) allows for better overall memory utilization.

Jan

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