Re: calculate actual state of caches wrt set of files/dirs, without modifying caches ?

[Andi Kleen]

"Yakov Lerner" <iler.ml@xxxxxxxxx> writes:

> Is it possible to calculate the following thing from userspace:
> Some benchmarking program has list of filenames and dirnames.
> Can it calculate how many of inodes and data blocks of those items are *cached*
> vs how many are not, without modifying existing
> status of inode caches & buffer caches ?

For inodes/dentries it is not possible AFAIK (short of taking a kernel
crash dump and walking the data structures), but for file data you can mmap 
the file without accessing it and then check with mincore() for each page.

-Andi
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