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On Mon, 31 Dec 2001, Andrew Morton wrote: > Looks like you'll need to do a __get_user() against the page to > populate the tlb. We're going to need it in the copy_to_user() > anyway, so the cost is negligible. Completly puzzled right now. Moving the prefetching to copy_to_user (and doing the tlb preload & prefetching the whole chunk to be copied (or cachesize if smaller)) results in a performance drop instead of a win. My initial guess is that some of the callers of copy_to_user are doing something that is harmed the prefetching. (Maybe they are doing additional prefetch() calls) Dave -- | Dave Jones. http://www.codemonkey.org.uk | SuSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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