How much memory is really free?

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I know that some part of memory is free, but they are used in caches to optimise the performance when the system needs to allocate more memory. And, dentry caches and disk buffer_head are used to minimise disk access. SO, give the current mem info from "cat /proc/meminfo", how sould I calculate how much memory is really free creently in the system?

> cat /proc/meminfo
MemTotal:      1017848 kB
MemFree:       10380 kB
Buffers:          37480 kB
Cached:         149868 kB

Can I just assume that 70% of un-used memory (un-used=mem_total - buffers - cached) is free, without actually causing the system to swapping?

Thanks in advance!

Fei



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