Re: [RFC] mmaped copy too slow?

[KOSAKI Motohiro]

Hi Paulo

> One thing you could also try is to pass MAP_POPULATE to mmap so that the 
> page tables are filled in at the time of the mmap, avoiding a lot of 
> page faults later.
> 
> Just my 2 cents,

OK, I will test your idea and report about tomorrow.
but I don't think page fault is major performance impact.

may be, below 2 things too big
  - stupid page reclaim
  - large cache pollution by memcpy.

Just my 2 cents :-p


- kosaki


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