Re: call_rcu from trace_preempt

[Alexei Starovoitov]

On 6/16/15 5:47 PM, Steven Rostedt wrote:
> Do what I do in tracing. Use a bit (per cpu?) test.
>
> Add the element to the list (that will be a cmpxchg, but I'm not sure
> you can avoid it), then check the bit to see if the irq work is already
> been activated. If not, then activate the irq work and set the bit.
> Then you will not have any more cmpxchg in the fast path.

you mean similar to what rb_wakeups() and friends are doing?
makes sense. starting to study it...

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