Re: [PATCH] Recent VM fiasco - fixed

From: Jim Nance (
Date: Thu May 11 2000 - 21:51:21 EST

On Wed, May 10, 2000 at 10:10:13PM -0700, Linus Torvalds wrote:
> Because it's a classic "walk a large array in order" test, which means
> that the worst possible order to page things out in is LRU.
> So toreally speed up mmap002, the best approach is to try to be as non-LRU
> as possible, which is obviously the wrong thing to do in real life. So in
> that sense optimizing mmap002 is a _bad_ thing.

I agree with you. However, some "real" programs do make sequential passes
through large blocks of memory. It would be nice if we could detect that
a program was doing this and keep it from flushing out other processes
pages. I realize that now is probably not a good time to work on this.



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