Re: [PATCH 02/10] perf, tools, stat: Force --per-core mode for .agg-per-core aliases

[Jiri Olsa]

On Tue, Dec 15, 2015 at 04:54:18PM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> 
> When an event alias is used that the kernel marked as .agg-per-core, force
> --per-core mode (and also require -a and forbid cgroups or per thread mode).
> This in term means, --topdown forces --per-core mode.
> 
> This is needed for TopDown in SMT mode, because it needs to measure
> all threads in a core together and merge the values to compute the correct
> percentages of how the pipeline is limited.
> 
> We do this if any alias is agg-per-core.
> 
> Add the code to parse the .agg-per-core attributes and propagate
> the information to the evsel. Then the main stat code does
> the necessary checks and forces per core mode.
> 
> Open issue: in combination with -C ... we get wrong values. I think that's
> a existing bug that needs to be debugged/fixed separately.

could you please be more specific on what's failing for you?

thanks,
jirka
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