Re: [PATCH 10/10] perf, tools, stat: Output JSON MetricExpr metric

From: Jiri Olsa
Date: Thu Feb 09 2017 - 13:47:57 EST

On Thu, Feb 09, 2017 at 09:00:35AM -0800, Andi Kleen wrote:
> On Thu, Feb 09, 2017 at 12:39:37PM +0100, Jiri Olsa wrote:
> > and this makes me think, that this is not the right approach
> >
> > adding extra copy of an event when you want to add new expression?
> I don't want to add new expressions.
> I don't even need arbitrary expressions, just DividedBy
> to get percentages, you just forced me to do the expressions.
> > why can't we have another list/file of those expressions
> The last time I proposed separate files Ingo vetoed it.
> He wanted everything built in.

sure, he veto it for event files.. expressions could be built
in same way as we have events now

> > from which point we could point and configure events we need
> If you want full flexibility you can use your perf stat report
> approach, or what most people do is to just run a script/spreadsheet
> over the the -x; output. This all continues to work.
> This is just a minimum approach to provide some convenience
> integrated with the event list to provide something similar
> as the built in expressions in stat-shadow.
> It's not trying to build the great perf scripting language.

yea I understand that but can't ack that based on the points
I descibed in my other email