Jes Sorensen wrote:
Jeremy Fitzhardinge wrote:Jes Sorensen wrote:This change has been on the x86 side for ages, and not even Ingo made a peep about it ;)Mmmm, last time I looked, x86 didn't scale to any interesting number of CPUs :-)
Well, I guess you need all those CPUs if scanning a 64-word bitvector takes anything like the time it takes to do an IPI...
I wasn't suggesting we shouldn't have both interfaces, merely questioning why adding what to me seems like an unnecessary performance hit for the classic case of the call.
I don't mind how many interfaces there are, so long as there only needs to be one place to hook to plug in the Xen version of smp_call_function_whatever. Perhaps the answer is to just hook the IPI mechanism itself rather than the whole of smp_call_function_mask...
Have you looked at Jens Axboe's patches to make all this stuff a lot more arch-common?
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