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Re: [PATCH v2 16/18] x86: introduce helper for recording degree of contiguity in page tables
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Tue, 4 Jan 2022 09:57:50 +0100
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On Tue, Dec 21, 2021 at 09:09:45AM +0100, Jan Beulich wrote:
> On 20.12.2021 16:25, Roger Pau Monné wrote:
> > I think it might be interesting to add some kind of unit testing to
> > this code in tools/tests. It's a standalone piece of code that could
> > be easily tested for correct functionality. Not that you should do it
> > here, in fact it might be interesting for me to do so in order to
> > better understand the code.
>
> Actually I developed this by first having a user space app where I could
> control insertions / removals from the command line. Only once I had it
> working that way was when I converted the helper function to what's now
> in this header. But that user space app wouldn't directly lend itself to
> become an element under tools/tests/, I'm afraid.
Also, I'm curious, did you develop the algorithm yourself, or is there
some prior literature about it? I wonder how other OSes deal with this
problem if they support coalescing contiguous pages.
Thanks, Roger.
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