Re: [RFC] kernel facilities for cache prefetching

[Wu Fengguang]

On Wed, May 03, 2006 at 06:20:29PM -0400, Rik van Riel wrote:
> Why not simply read everything in a whole file at a time
> at boot time, while we still have enough free memory ?

Sure it helps, though may be unnecessary once we can rely on userspace
pre-caching tools to do it in a more accurate and efficient way.

The main concern would be inter-file/inter-buffer readahead.
I have some data to support it:

% wc -l hda* startup.files
 1743 hda2_buffers      <== my /
 335 hda3_buffers       <== my /home
 1130 startup.files
 3208 total

The above cache sizes sum up to ~110MB, so it's about 36KB per seek.

Thanks,
Wu
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