page-cache hit ratio

page-cache hit ratio

[Prateek Sharma]

Hello ,
   I would like to know if there is any existing mechanism in the
kernel to get the page-cache statistics like hit-ratios etc.
So far i have found 2 ways of doing this:
First is to instrument the find_get_page routine using ftrace
trace-events, as done here : [http://lkml.org/lkml/2011/7/21/25] .
The other is to use something like system tap :
http://serverfault.com/questions/157612/is-there-a-way-to-get-cache-hit-miss-ratios-for-block-devices-in-linux

However i seem to getting different results from these two approaches.
I'd like to know if there is any framework for evaluating linux-mm
performance (which has cache statistics) ?

Thanks!

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