Re: kdbus: to merge or not to merge?

[Daniel Mack]

On 08/06/2015 08:43 PM, Andy Lutomirski wrote:
> Nonetheless, it looks like the slice logic (aside: it looks *way* more
> complicated than necessary -- what's wrong with circular buffers)
> will, under most (but not all!) workloads, concentrate access to a
> smallish fraction of the pool.  This is IMO bad, since it means that
> most of the time most of the pool will remain uncommitted.  If, at
> some point, something causes the access pattern to change and hit all
> the pages (even just once), suddenly all of the pools get committed,
> and your memory usage blows up.

That's a general problem with memory overcommitment, and not specific to
kdbus. IOW: You'd have the same problem with a similar logic implemented
in userspace, right?


Daniel

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