linux-kernel - Re: [RFCv2 0/8] perf tool: Add new event group management

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Date:	Mon, 16 Apr 2012 14:16:28 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	acme@...hat.com, mingo@...e.hu, paulus@...ba.org,
	cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	andi@...stfloor.org
Subject: Re: [RFCv2 0/8] perf tool: Add new event group management

On Sun, Apr 15, 2012 at 05:16:55PM +0200, Peter Zijlstra wrote:
> On Wed, 2012-04-04 at 23:16 +0200, Jiri Olsa wrote:
> > - added 'group=...' syntax to group events (patches 1-5).
> 
> > - added 'group:1=...' syntax to specify which event to sample (leader) 
> 
> I'm still sad about not actually using {} for grouping. Esp. since you
> use ';' which needs escaping anyway:

yea, I realized we need ending separator after all ;)
so right we could use {} then..

so smth like:

  '{cycles,faults}'
   - anonymous group

  'group1{cycles,faults}
   - group with name 'group1'

  'group1:1{cycles,faults}
   - group with name 'group1' and modifier '1'

  'group1{cycles,faults},{instructions,cache-misses},faults'
  '{cycles,faults},group1:2{instructions,cache-misses},faults' ls
   - group/event combinations 


group:        group_spec '{' events '}'
group_spec:   name  ':' mod | empty


also, any thoughts about the displaying question? ;)

> I'm looking on how to present this data in perf and it seems we need
> to reset all siblings once we read/store them (in kernel) to the
> leader sample.
> 
> My current thinking is to store siblings' sum values for each
> hists entry of the sample (perf report count unit) .. and display
> them in similar way we display callchains: for each hists entry
> display the sum value for each sibling.
> 
> Could you provide more of your world examples? Your expectations about
> presenting this..
> 
> Maybe we want to make the reset optional, and do some do some other
> math with siblings' values..?

Not sure it could affect the syntax, but it'd be better to have
whole picture

thanks,
jirka
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