Messages in this thread | | | Date | Mon, 28 Jan 2002 15:12:47 -0800 | From | Rick Stevens <> | Subject | Re: Note describing poor dcache utilization under high memory pressure |
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Daniel Phillips wrote:
> Since the page was copied to the child, the child's page table must be > altered, and since it is shared, it must first be instantiated by the child. > So after all the dust settles, the parent and child have their own copies of > a page table page, which differ only at a single location: the child's page > table points at its freshly made CoW copy, and the parent's page table points > at the original page.
> > The beauty of this is, the page table could just as easily have been shared > by a sibling of the child, not the parent at all, in the case that the parent > had already instantiated its own copy of the page table page because of an > earlier CoW.
Ok. Still seems like a bit more copying than necessary. I'd have to look at it a bit more and do some noodling.
> Confused yet? Welcome to the club ;-)
Does my head exploding qualify for "confused"? If so, then I'm not yet "confused". I'm "concerned", since my ears are bleeding (a precursor to an explosion) ;-p
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