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x86, UV: cpu_relax in uv_wait_completion
authorCliff Wickman <cpw@sgi.com>
Thu, 15 Jan 2009 15:51:20 +0000 (09:51 -0600)
committerIngo Molnar <mingo@elte.hu>
Thu, 15 Jan 2009 22:48:20 +0000 (23:48 +0100)
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>

No differences found
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