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Buffers VS Page Cache



Good day.

I'm trying to understand difference between Buffers and Page Cache in Linux, but found almost no documentation.

As far as I understand buffers and Page Cache serves same purpose: they save recent reed/written pages and allow to reduce amount of actual IO.

So, the questions:

1) What difference between buffers and page cache?
2) What data goes to Cache?
3) What data goes to Cache?
4) Why this separation was needed?


Thanks.


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