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(parent: 4a13ad0) | patch
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)
commit18c07cf530cf4aa8b7551801f68ed40db5ee4e45
tree0e57822a4d34535a0da87c3e2187b3264c26c856tree | snapshot
parent4a13ad0bd8869bb491c67918662f9b1852595af5commit | diff
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>
arch/x86/kernel/tlb_uv.c diff | blob | history
Domain: System / Uncategorized;