Re: [PATCH 1/5] ftrace: Synchronize variable setting withbreakpoints
From: Steven Rostedt
Date: Thu May 31 2012 - 16:38:17 EST
On Thu, 2012-05-31 at 22:26 +0200, Peter Zijlstra wrote:
> Right, but when you loose stop-machine you could simply do 30k
> kmap_atomic/kunmap_atomic's consecutively since you're not holding
> anybody up.
It requires 3 IPIs per update too. Thus that's 90,000 IPIs you are
blasting^Wsending to all CPUs.
-- Steve
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