Fri, Apr 20, 2007 at 12:24:17PM -0700, Christoph Lameter wrote:
>>> False sharing for a per cpu data structure? Are we updating that
>>> structure from other processors?
On Fri, 20 Apr 2007, William Lee Irwin III wrote:
>> Primarily in the load balancer, but also in wakeups.
On Fri, Apr 20, 2007 at 12:33:13PM -0700, Christoph Lameter wrote:
> That is fairly rare I think. What other variables that are also writtten
> frequently would cause false sharing?
I wrote that backward, sorry. Cross-CPU wakeups' frequency depend
heavily on the workload. Probably the only other case I can think of
is io_schedule() but that's not really significant.
I'm not really convinced it's all that worthwhile of an optimization,
essentially for the same reasons as you, but presumably there's a
benchmark result somewhere that says it matters. I've just not seen it.
-- wli
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