x86, UV: cpu_relax in uv_wait_completion

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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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Cliff Wickman 2009-01-15 09:51:20 -06:00 • committed by Ingo Molnar

parent 4a13ad0bd8

commit 18c07cf530

1 changed files with 1 additions and 0 deletions

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arch/x86/kernel/tlb_uv.c

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