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

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Date:   Fri, 8 Dec 2017 15:38:06 +0000
From:   John Garry <john.garry@...wei.com>
To:     Jiri Olsa <jolsa@...hat.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 08/12/2017 12:31, Jiri Olsa wrote:
> 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,
>>

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> ;-)
>

Hi jirka,

I think the issue is that jevents is a "hostprogs", which does not use 
kernel headers.

FWIW, here is the symptom:
pmu-events/jevents.c:51:24: fatal error: linux/list.h: No such file or 
directory
  #include <linux/list.h>
                         ^
compilation terminated.
mv: cannot stat ‘pmu-events/.jevents.o.tmp’: No such file or directory

perf tool build is different.

Much appreciated,
John


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