why memory usage is so different between sum of RSS and free?
Issue
Server has 528G-sized memory, "free -m" indicates 404G of memory has been using by server now, Customer checked memory usage is 120G from sum of rss,
404G(buffers/cache used) -120G(from RSS sum)- 70G(used by ramdisk/tmpfs)=202G,
where have the 202G-sized memory gone?
Environment
Red Hat Enterprise Linux 5 All versions
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