about profiling and stats info for pagecache/buffercache

[Alexey Zhuravlev <alexey@datafoundation.com>]

Hello!

As far as I understand, now Linux have no facility to collect stats info
for pagecache/buffercache. For example, it'd be fine if we can see how 
many requests were submited to pagecache/buffercache and how many of 
these requests was serviced from cache without I/O. Moreover, it'd be fine
to have some profiling info on requests for pagecache/buffercache...


--
poka, lexa
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