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xen-devel
Re: [Xen-devel] [PATCH] linux/balloon: don't allow ballooningdowna domai
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To: |
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH] linux/balloon: don't allow ballooningdowna domain below a reasonable limit |
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From: |
Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> |
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Date: |
Fri, 2 May 2008 00:03:10 +0100 |
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Cc: |
"dan.magenheimer@xxxxxxxxxx" <dan.magenheimer@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ky Srinivasan <KSrinivasan@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx>, KurtGarloff <garloff@xxxxxxx> |
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Thu, 01 May 2008 16:11:30 -0700 |
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> It might be the case though that, in practice, vm_committed_space is a
> reasonable predictor for working set for some common types of workload. Many
> applications probably keep their heaps fairly warm and hence in main memory.
I am dubious. What vm_committed_space does allow you to do however if you
watch it in Xen is to actually ensure you never balloon out a virtual
machine to the point you make it start killing stuff off.
There are better ways to measure memory pressure - sizes of the various
active and inactive lists etc. OLPC has code for this and a proposed
memory pressure notifier feature that they use to allow user space apps
to cleanup.
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