swapin_readahead

[jean <nomkchina@yahoo.com>]

Hi:

What's the reason behind:
void swapin_readahead(swp_entry_t entry)
 in mm/memory.c 

Is it just because that it does not cause seek time?
Does swap reads from a swap area also exhibit spacial
locality? i.e. adjacent entries in swap area would
likely be accessed in sequence? (since they were
temporally adjacent before swapping out?)

Would that cause a lot of unnecessary swap readaheads?

I'm doing a measurement, and surprising found that a
lot of swap in readaheads are wasted. I'm not sure if
the measurement is wrong.

Thanks &
regards

jean

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