linux-kernel - Re: [PATCH 2/3 -tip] perf_counter tools: Add support to set of multiple events in one shot

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Date:	Sun, 28 Jun 2009 20:46:06 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3 -tip] perf_counter tools: Add support to set of
 multiple events in one shot

On Sun, 2009-06-28 at 15:29 +0200, Ingo Molnar wrote:
> * Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:
> 
> > On Sat, 2009-06-27 at 18:38 +0200, Ingo Molnar wrote:
> > > * Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:
> > > 
> > > > Add support for HARDWARE and SOFTWARE events :
> > > >  perf stat -e all-sw-events
> > > >  perf stat -e sw-events
> > > >  perf stat -e all-hw-events
> > > >  perf stat -e hw-events
> > > 
> > > > +static struct event_type_symbol event_type_symbols[] = {
> > > > + [PERF_TYPE_HARDWARE]	= { "hw-events",	"all-hw-events",	},
> > > > + [PERF_TYPE_SOFTWARE]	= { "sw-events",	"all-sw-events",	},
> > > 
> > > Hm, this really just special-cases and open-codes these. The better 
> > > solution is what i suggested in my review of your prior patches: 
> > > regex pattern matching.
> > > 
> > 
> > parse_events() is responsible to parse events for 'perf stat -e' 
> > and it is parsing by parse_event_symbol()
> > 
> > If you want to use regex pattern matching then either we should 
> > make some another option or if we need to rewrite 
> > parse_event_symbol to use regex pattern matching which will be 
> > applicable to all the events.
> 
> As i mentioned it before, i think the most intuitive solution is to 
> extend the --event syntax with regex patterns. No new option - just 
> richer -e syntax.
> 
> We could have this syntax:
> 
>   hw-cpu-cycles
>   hw-instructions
>   hw-cache-references
>   hw-cache-misses
>   hw-branch-instructions
>   hw-branch-misses
>   hw-bus-cycles
> 
>   sw-cpu-clock
>   sw-task-clock
>   sw-page-faults
>   sw-minor-faults
>   sw-major-faults
>   sw-context-switches
>   sw-cpu-migrations
> 
> regex patterns like:
> 
>   hw-*
>   sw-*
>   *
> 
> the first one would select all hardware events - the second all 
> software events - the third all events in general. But other regex 
> patterns make sense too, like:
> 
>   *branch*
>   *cache*
>   *fault*
> 
> And as the number of generic events increases, so will regex 
> patterns become more and more useful.
> 

This is a good approach, but this should be done separately because
these will effect all the events.

Currently I send patches to support multiple events in one shot which is
adding new feature.

And you telling to use regex wildcard for all the events in
parse_event_symbol() which is enhancement and should be done in series
of patches.

Do not you think you are mixing 2 things. I request you to accept
"multiple events in one shot" patches. And then we will do enhancement.

Thanks,
--
JSR



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