On Fri, 16 Jun 2006, Andi Kleen wrote:
To this last point, it might be more reasonable to map in a page that contained a new structure with a stable ABI, which mirrored some of the task_struct information, and likely other useful information as needs are identified in the future. In any case, it would be hard to beat a single memory read for performance.That would mean making the context switch and possibly other things slower.
Well, if every process had a page of its own, what would the context switch overhead be?
But, I'm not advocating exporting anything. Though I sort of like the vgetcpu() idea because I was working on a user-space slab allocator recently and magazines could use vgetcpu() instead of pthread keys.
(Also means if threads > cpus I'd get better results). Thanks, Chase - : send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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