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Re: [Qemu-devel] [RFC PATCH RDMA support v5: 03/12] comprehensive protoc

From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [RFC PATCH RDMA support v5: 03/12] comprehensive protocol documentation
Date: Sun, 14 Apr 2013 11:28:27 +0300

On Fri, Apr 12, 2013 at 09:47:08AM -0400, Michael R. Hines wrote:
> Second, as I've explained, I strongly, strongly disagree with unregistering
> memory for all of the aforementioned reasons - workloads do not
> operate in such a manner that they can tolerate memory to be
> pulled out from underneath them at such fine-grained time scales
> in the *middle* of a relocation and I will not commit to writing a solution
> for a problem that doesn't exist.

Exactly same thing happens with swap, doesn't it?
You are saying workloads simply can not tolerate swap.

> If you can prove (through some kind of anaylsis) that workloads
> would benefit from this kind of fine-grained memory overcommit
> by having cgroups swap out memory to disk underneath them
> without their permission, I would happily reconsider my position.
> - Michael

This has nothing to do with cgroups directly, it's just a way to
demonstrate you have a bug.


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