Re: Fw: potential /dev/urandom scalability improvement

From: David Mosberger
Date: Fri Mar 26 2004 - 15:26:49 EST

>>>>> On Fri, 26 Mar 2004 10:49:04 -0800, Andrew Morton <akpm@xxxxxxxx> said:

Andrew> But the start address which is fed into prefetch_range() may
Andrew> not be cacheline-aligned. So if appropriately abused, a
Andrew> prefetch_range() could wander off the end of the user's
Andrew> buffer and into a new page.

Andrew> I think this gets it right, but I probably screwed something
Andrew> up.

Please, let's not make this more complicated than it is. The
cacheline alignment doesn't matter at all. Provided prefetch_range()
is given a range of guaranteed to be valid memory, then it will be
fine. It never touches anything outside the specified range.

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