Quote:
Inact_dirty: Dirty means "might need writing to disk or swap." Takes more work to free. Examples might be files that have not been written to yet. They aren't written to memory too soon in order to keep the I/O down. For instance, if you're writing logs, it might be better to wait until you have a complete log ready before sending it to disk.
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I don't know how to flush/free all of it, but it most of the Inact_dirty pages are from file I/O, you can always type "sync" to sync this data to disk. That should allow the synced pages to be freed much faster.. Not really what you are looking for, but I hope it's a step in the right direction..