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Date: Mon, 21 May 2007 04:37:47 -0700 From: William Lee Irwin III <wli@...omorphy.com> To: David Miller <davem@...emloft.net> Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org Subject: Re: that page count overflow thing On Sat, May 19, 2007 at 03:26:49PM -0700, David Miller wrote: > I think we may be able to fix that one without making the > counter larger, it's silly overhead for such an extreme > case IMHO. > Perhaps it might be possible to just make the counter stick at it's > maximum, and when it's there we have an rbtree of external "large" > counters, keyed by page struct address. > So basically externalize counters that go over the maximally > representable value. In this way only the idiotic cases pay > the price. This could be awkward with allocation requirements. How about an open-addressed hash table? It can be made so large as to never need to expand in advance with a very small constant factor space overhead. -- wli - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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