(Sorry for the empty reply! Pine over a laggy SSH connection is annoying
sometimes)
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
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