Re: why swap at all?

[jlnance]

> > cp should use fadvise() and say that it _really_ does not need those pages.
> 
> Yes, indeed. On the other hand the sequential read could be detected by the kernel, too.

I'm not sure.  Copying a file is a pretty good indication that you
are about to do something with either the new or the old file.

Thanks,

Jim
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