Re: [PATCH 1/5] ftrace: Synchronize variable setting withbreakpoints

[Steven Rostedt]

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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