AFAIK, you simply can't... I'm trying to do this for several months and
no luck. Linux simply caches everything it can in the read-cache. For
99% of all cases this is very good but, for some situations, this is not
desireable.
For the write cache, you can minimize memory usage playing with
/proc/sys/vm (see Documentation/filesystems/proc.txt).
Regards,
Nuno Silva
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