How do I clear the buffer/pagecache (disk cache) when memory utilization reaches a specific percentage value?

Solution Verified - Updated -

Issue

  • How do I clear the buffer/pagecache (disk cache) when memory utilization reaches a specific percentage value?
  • How do I tune the kernel to reclaim the dirty pages automatically when the memory utilization reaches aspecific percentage value?
  • How do I activate pdflush and kswapd when the memory utilization reaches a specific percentage value? of its usage and clean up pagecache and reclaim memory space?

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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