Re: Swap

[Andrew Morton]

"David S. Miller" wrote:
> 
>    From: Rik van Riel <[e-mail]>
>    Date: Tue, 20 Nov 2001 20:05:05 -0200 (BRST)
> 
>    Consider this a VM bug, mmap() really should be more efficient.
> 
> read() is always going to be faster until mmap() can
> use large page mappings for the user.  This is why
> mmap() is slower.
> 
> Even if the whole thing is cached in memory, read() will
> always be faster.

Could you please explain further?  What's more expensive
than the copy?