Messages in this thread | | | Subject | Re: [PATCH 10 of 20] ipath - support for userspace apps using core driver | From | Roland Dreier <> | Date | Thu, 09 Mar 2006 16:32:46 -0800 |
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Bryan> We're mapping some memory that the chip DMAs to into Bryan> userspace, so that user processes can spin on memory Bryan> locations without going through the kernel. The Bryan> SetPageReserved hack is an attempt to stop the VM from Bryan> reclaiming those pages from us once a user process exits.
Bryan> I realise that it's surely bogus, and I'd be thrilled to do Bryan> something correct instead. We've tried doing both Bryan> SetPageReserved and get_page, but it hasn't work out too Bryan> well so far.
What's wrong with doing get_page()? Surely the VM won't take pages that you hold a reference to.
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