linux-kernel - Re: [RFC PATCH 2/5] perf jevents: add support for arch recommended events

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Message-ID: <20171208123137.GF2799@krava>
Date:   Fri, 8 Dec 2017 13:31:37 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     John Garry <john.garry@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        ak@...ux.intel.com, wcohen@...hat.com, will.deacon@....com,
        ganapatrao.kulkarni@...ium.com, catalin.marinas@....com,
        mark.rutland@....com, xuwei5@...ilicon.com, linuxarm@...wei.com,
        zhangshaokun@...ilicon.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/5] perf jevents: add support for arch recommended
 events

On Wed, Dec 06, 2017 at 02:40:10PM +0000, John Garry wrote:
> On 06/12/2017 13:37, Jiri Olsa wrote:
> > On Wed, Dec 06, 2017 at 12:13:16AM +0800, John Garry wrote:
> > 
> > SNIP
> > 
> > > ---
> > >  tools/perf/pmu-events/jevents.c | 215 ++++++++++++++++++++++++++++++++++++----
> > >  1 file changed, 198 insertions(+), 17 deletions(-)
> > > 
> > > diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
> > > index a0d489e..a820ed4 100644
> > > --- a/tools/perf/pmu-events/jevents.c
> > > +++ b/tools/perf/pmu-events/jevents.c
> > > @@ -42,6 +42,7 @@
> > >  #include <dirent.h>
> > >  #include <sys/time.h>			/* getrlimit */
> > >  #include <sys/resource.h>		/* getrlimit */
> > > +#include <sys/queue.h>
> > >  #include <ftw.h>
> > >  #include <sys/stat.h>
> > >  #include "jsmn.h"
> > > @@ -366,6 +367,94 @@ static int print_events_table_entry(void *data, char *name, char *event,
> > >  	return 0;
> > >  }
> > > 
> > > +struct event_struct {
> > > +	char *name;
> > > +	char *event;
> > > +	char *desc;
> > > +	char *long_desc;
> > > +	char *pmu;
> > > +	char *unit;
> > > +	char *perpkg;
> > > +	char *metric_expr;
> > > +	char *metric_name;
> > > +	char *metric_group;
> > > +	LIST_ENTRY(event_struct) list;
> > 
> > is there any reason you don't use the 'struct list_head' ?
> > I dont think we want another thingie involved for lists
> 
> Hi jirka,
> 
> The linux kernel headers are not used for jevents tool. I would rather use
> them if possible...

should be as easy as adding  #include <linux/list.h> ;-)

it's heavily used within perf and I'm pretty sure we want
to keep around just one way of doing lists

thanks,
jirka