about profiling and stats info for pagecache/buffercache

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...

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OK, so you want:

pagecache nr_requests hit mis
buffercache nr_requests hit mis

I'd like to see a few other statistics as well, mainly for the pageout code...

- nr pages scannned
- nr pages moved to the inactive_clean list
- nr pages "rescued" from the inactive_clean list
- nr pages evicted
- nr pages deactivated by pageout scanning
- nr pages deactivated by drop-behind

Are there any more ideas for statistics people would like to see?

regards,

Rik
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Hi,

As long as that's per-zone, and includes failed scans as well as successes, fine.

--Stephen
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