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x86, UV: cpu_relax in uv_wait_completion
The function uv_wait_completion() spins on reads of a memory-mapped register, waiting for completion of BAU hardware replies. It should call "cpu_relax()" between those reads to improve performance on hyperthreaded configurations. Signed-off-by: Cliff Wickman <cpw@sgi.com> Acked-by: Jack Steiner <steiner@sgi.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -200,6 +200,7 @@ static int uv_wait_completion(struct bau_desc *bau_desc,
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destination_timeouts = 0;
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}
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}
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cpu_relax();
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}
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return FLUSH_COMPLETE;
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}
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