Re: [PATCH 22/33] readahead: initial method

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BTW. while your patchset might be nicely broken down, I think your
naming and descriptions are letting it down a little bit.

Wu Fengguang wrote:

Aggressive readahead policy for read on start-of-file.

Instead of selecting a conservative readahead size,
it tries to do large readahead in the first place.

However we have to watch on two cases:
	- do not ruin the hit rate for file-head-checkers
	- do not lead to thrashing for memory tight systems



How does it handle
            -  don't needlessly readahead too much if the file is in cache


Would the current readahead mechanism benefit from more aggressive start-of-file
readahead?

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