When I/O Express extends the pool, how does the size of the pool get reduced?

When I/O Express extends the non-paged pool, it will hold onto that pool until the system is rebooted. There is a point at which I/O Express will no longer extend the pool, but I/O Express will keep the pool once it gets it.

I/O Express uses non-paged pool for data structures, which point to pages in the cache. These are the data structures that are searched when I/O Express intercepts a read I/O, to determine if the requested data is in cache or not. If it is, I/O Express redirects the I/O to the cache; if not, I/O Express lets it pass through to the disk queue.

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