If a large number of page-ins occurs , then this could be a sympyom of a large number of page-outs that happened recently. To find out what process is reading in these pages at the moment , check the resident size of the processes you are running , and see which one(s) are increasing.
A large amount of page-ins may also occur when a large process has just stopped for some reason, and the kernel decides to fill that space with memory pages owned by other processes. Make sure that an important process hasn't unexpectedly died.
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