linux-kernel - Re: [RFC][PATCH 5/8] RSS controller task migration support

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Message-Id: <20061121100150.9ECCF1B6AC@openx4.frec.bull.fr>
Date:	Tue, 21 Nov 2006 11:01:50 +0100 (CET)
From:	Patrick.Le-Dot@...l.net (Patrick.Le-Dot)
To:	balbir@...ibm.com
Cc:	ckrm-tech@...ts.sourceforge.net, dev@...nvz.org,
	haveblue@...ibm.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, rohitseth@...gle.com
Subject: Re: [RFC][PATCH 5/8] RSS controller task migration support

On Fri, 17 Nov 2006 22:04:08 +0530
> ...
> I am not against guarantees, but
> 
> Consider the following scenario, let's say we implement guarantees
> 
> 1. If we account for kernel resources, how do you provide guarantees
>    when you have non-reclaimable resources?

First, the current patch is based only on pages available in the
struct mm.
I doubt that these pages are "non-reclaimable"...

And guarantee should be ignored just because some kernel resources
are marked "non-reclaimable" ?


> 2. If a customer runs a system with swap turned off (which is quite
>    common),

quite common, really ?

>             then anonymous memory becomes irreclaimable. If a group
>    takes more than it's fair share (exceeds its guarantee), you
>    have scenario similar to 1 above.

That seems to be just a subset of the "guarantee+limit" model : if
guarantee is not useful for you, don't use it.

I'm not saying that guarantee should be a magic piece of code working
for everybody.

But we have to propose something for the customers who ask for a
guarantee (ie using a system with swap turned on like me and this is
quite common:-)

Patrick

+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+    Patrick Le Dot
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