On Wed, 15 Jan 2014, Jeff Liu wrote:

Now I have a rough/stupid idea to add an extension to the slab caches [2], that is
if the slab cache size is limited which could be determined in cache_grow(), the
shrinker would be triggered accordingly.  I'd like to learn/know if there are any
suggestions and similar requirements in other subsystems.

Hmmm.... Looks like you got the right point where to insert the code to
check for the limit. But lets leave the cache creation API the way it is.
Add a function to set the limit?

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