linux-kernel - Re: [PATCH 5/9] perf utils: add support for arch standard events

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Date:   Thu, 8 Feb 2018 15:57:35 +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>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, <zhangshaokun@...ilicon.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 5/9] perf utils: add support for arch standard events

On 08/02/2018 13:54, Jiri Olsa wrote:
> On Wed, Feb 07, 2018 at 01:45:00AM +0800, John Garry wrote:
>

Hi Jirka,

I'll try to combine some responses, below:

> SNIP
>
>> +static void fixup_field(char *from, char **to)
>> +{
>> +	*to = malloc(strlen(from));
>> +
>> +	strcpy(*to, from);
>> +}
>> +
>> +#define EVENT_PREFIX "event="
>> +
>> +#define TRY_FIXUP_FIELD(string)	do { if (es->string && !*string)\
>> +			fixup_field(es->string, string);	\
>> +} while (0)
>
> please indent the code in the macro like normal code
>

Ok

>> +
>> +static int
>> +try_fixup(const char *fn, char *arch_std, char **event, char **desc,
>> +	  char **name, char **long_desc, char **pmu, char **filter,
>> +	  char **perpkg, char **unit, char **metric_expr, char **metric_name,
>> +	  char **metric_group)
>> +{
>> +	/* try to find matching event from arch standard values */
>> +	struct event_struct *es;
>> +
>> +	list_for_each_entry(es, &arch_std_events, list) {
>> +		if (!strcmp(arch_std, es->event+strlen(EVENT_PREFIX))) {
>
> you could use just sizeof(EVENT_PREFIX). no need to call strlen
>

Right,

 >> +
 >> +static LIST_HEAD(arch_std_events);
 >> +
 >> +#define ADD_EVENT_STRING(string) do { if (string) {		\
 >> +	es->string = strings;					\
 >> +	strings += snprintf(strings, len, "%s", string) + 1;	\
 >> +} } while (0)
 >
 > please indent the code in macro like normal code

This looked ok, with a single tab indent. It is same style as "EXPECT" 
macro.

 >>  	mapfile = NULL;
 >> +	rc = nftw(ldirname, preprocess_arch_std_files, get_maxfds(), 0);
 >
 > you could use maxfds variable in here

sure

 >>
 >> +free_standard_arch_events:
 >> +	list_for_each_entry_safe(es1, es2, &arch_std_events, list)
 >> +		free(es1);
 >
 > that could go into a function and be used also above

fine

 >>  		free(metric_name);
 >>  		free(metric_group);
 >> +
 >
 > should you call free(arch_std) in here?

Right, that's sloppy

 >>  	if (rc && verbose) {
 >>  		pr_info("%s: Error walking file tree %s\n", prog, ldirname);
 >> -		goto empty_map;
 >> +		goto free_standard_arch_events;
 >>  	} else if (rc < 0) {
 >>  		/* Make build fail */
 >>  		return 1;
 >> -	} else if (rc) {
 >> -		goto empty_map;
 >>  	}
 >
 > please put this change into separate patch
 >
 > thanks,

Sure, I just couldn't see how a value > 0 could be returned in the 
current code paths.

> jirka
>
> .
>

Thanks,
John