Messages in this thread | | | Date | Thu, 19 Oct 2006 19:13:46 +0100 | From | Ralf Baechle <> | Subject | Re: [PATCH 1/3] Fix COW D-cache aliasing on fork |
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On Fri, Oct 20, 2006 at 03:46:35AM +1000, Nick Piggin wrote:
> What about if you just flush the caches after write protecting all > COW pages? Would that work? Simpler? Better performance? (I don't know)
That would require changing the order of cache flush and tlb flush. To keep certain architectures that require a valid translation in the TLB the cacheflush has to be done first. Not sure if those architectures need a writeable mapping for dirty cachelines - I think hypersparc was one of them.
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