linux-kernel - Re: [PATCH] perf tools: Add 'G' and 'H' modifiers to event parsing

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Date:	Tue, 17 Apr 2012 12:37:13 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, acme@...stprotocols.net,
	mingo@...hat.com, linux-kernel@...r.kernel.org, avi@...hat.com
Subject: Re: [PATCH] perf tools: Add 'G' and 'H' modifiers to event parsing

On Mon, Apr 16, 2012 at 10:10:30PM +0200, Jiri Olsa wrote:
> On Sun, Apr 15, 2012 at 06:23:00PM +0300, Gleb Natapov wrote:
> > On Sun, Apr 15, 2012 at 05:12:22PM +0200, Peter Zijlstra wrote:
> > > On Sun, 2012-04-15 at 17:59 +0300, Gleb Natapov wrote:
> > > > -modifier_event [ukhp]{1,5}
> > > > +modifier_event [ukhpGH]{1,5} 
> > > 
> > > You'd also need to increase the 5 to 7 I think, unless there's a clear
> > > exclusion with some of the other flags.
> > > 
> > > Hmm, as it stands I think the 5 is already too low: "ukhppp" is 6.
> > > 
> > > We should really write this as ['u'] ['k'] ['h'] ['G'] ['H'] ['p'{1,3}],
> > > not the combined thing.
> 
> you mean to match them strictly in parser, right?
> because what we have now can match also stuff like 'uuu' 'kkuu' ...
> 
> So far it eludes me how to do that purely in flex and
> doing this via rules in bison seems like overkill.
> 
> I'd rather keep it the way we have and do the extra check
> in parse_events_modifier function.. unless someone comes up
> with flex regular expression that would do that (which is
> possible given my regex knowledge..) 
> 
> also we need 8 characters for it, since this seems to be
> valid modifier: ukhGHppp
> 
So want me to resend with 8 to fix missing GH for now? I can't think of
proper regex either.

--
			Gleb.
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