Re: [PATCH 1/9] perf: Remove redundant parent context check from context_equiv

[Peter Zijlstra]

On Mon, Aug 25, 2014 at 04:45:35PM +0200, Jiri Olsa wrote:
> As described in commit:
>   1f9a7268c67f perf: Do not allow optimized switch for non-cloned events
> we dont allow optimized switch for non cloned contexts.
> 
> There's no need now to check if one of the context is parent
> of the other in context_equiv function.
> 

OK, so talk to me about that patch; it looks like you're slowly
reverting: 5a3126d4fe7c ("perf: Fix the perf context switch
optimization").

So what exactly is the problem? I'm still jet-lagged and not seeing it.
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