Can you try testing your hypothesis? Try starting a large process (say a JVM) on your Dom0 and then finish it. Do you see freed memory?
If you don't it means that your mental model of the Linux memory model is oversimplified. When a Linux process ends some of it's pages will have been shared and will remain in use, other memory will be used for the buffer cache. I'm not sure whether Linux has an equivalent to the solaris free list where freed pages will remain intact as a performance optimization in case they are needed again .
Regardless, memory allocation is a subtle, complex, misunderstood, nonintuitive, nonlinear craft.
Sent from my iPhone
Hello:
I have situation with xen 3.2.1 kernel 2.6.26-2 where when I shutdown a
VM neither the OS or dom0 sees the free'd memory.
I've searched around and dont see anything related. Am I missing some
config option or something? my /etc/xen/xend-config.sxp is set to
(dom0-min-mem 196)
Regards,
John Calderon
IODA, Sr Systems Admin
539 Bryant Street, Suite 303
San Francisco, CA 94107
office: 415.375.3250
jcalderon@xxxxxxxxxxxxxxx
www.iodalliance.com
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jer jer wrote:
Hi everybody,
I'm very interested in some features promised in xen 3.4.
One of them is the support for PV USB.
So, I've installed/compiled/installed a xen 3.4 (testing) hypervisor
and then I've launched a PV domU (using pygrub).
But all my google searches were useless to find any piece of info on
how to enable and test this functionnality.
Is this really implemented? If yes, has somebody ever succeeded to use
it.
Basically, I'd like to boot my domU then plug a USB stick and mount it
on domU.
If I understand well, this should not need any passthrough operation.
So I imagine that a specific line must be added on domU's configuration
file.
Any help appreciated!
Have a nice day.
Jérémie
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