Re: [PATCH 1/2] tracing/function-return-tracer: Make the function return tracer lockless

[Andi Kleen]

> So the answer to this is:
> 
>   i = index++;
>   barrier();
>   write to index i (not index);

That was my first thought when I wrote the original email,
but the disadvantage is that barrier() is a big hammer
that flushes everything and can make the code much worse.
That is why I suggested local_add_return() instead.

-Andi

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