linux-kernel - Re: [PATCH] perf script: improve validation of sample attributes for output fields

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Message-ID: <4D9CBC0B.5050602@cisco.com>
Date:	Wed, 06 Apr 2011 13:16:27 -0600
From:	David Ahern <daahern@...co.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, peterz@...radead.org, fweisbec@...il.com
Subject: Re: [PATCH] perf script: improve validation of sample attributes
 for output fields



On 04/06/11 12:58, Arnaldo Carvalho de Melo wrote:
> Em Sun, Apr 03, 2011 at 08:35:00AM -0600, David Ahern escreveu:
>> +++ b/tools/perf/builtin-script.c
>> @@ -94,41 +95,111 @@ static bool output_set_by_user(void)
>> +static const char *output_field2str(enum perf_output_field field)
>> +{
>> +	int i, imax = sizeof(all_output_options) / sizeof(struct output_option);
> 
> Use ARRAY_SIZE(all_output_options)
> 
>> +	for (i = 0; i < imax; ++i) {
>> +		if (all_output_options[i].field == field) {
>> +			str = all_output_options[i].str;
>> +			break;
> 
>> +static int perf_attr__check_stype(struct perf_event_attr *attr,
>> +				  u64 sample_type, const char *sample_msg,
>> +				  enum perf_output_field field)
> 
> s/perf_attr__check_stype/perf_event_attr__check_stype/g
> 
>> +	/* user did not ask for it explicitly so remove from the default list */
>> +	output[type].fields &= ~field;
>> +	evname = __event_name(attr->type, attr->config);
>> +	pr_debug("Samples for '%s' event do not have %s attribute set. "
>> +		 "Skipping '%s' field.\n",
>> +		 evname, sample_msg, output_field2str(field));
> 
> pr_warning?

In this case, it seems more like a debug. You have default options which
are not available for the specific perf.data file.


> 
>> +static int perf_evsel__check_attr(struct perf_session *session,
>> +				  struct perf_evsel *evsel)
> 
> for consistency, please make evsel the first parameter.
> 
>> +/* verify all user requested events exist and the samples
>> + * have the expected data
>> + */
>> +static int perf_session__check_output_opt(struct perf_session *session)
>> +{
>> +	int j;
>> +	struct perf_evsel *evsel;
>> +
>> +	for (j = 0; j < PERF_TYPE_MAX; ++j) {
>> +		evsel = perf_session__find_event(session, j);
> 
> You're nog finding an specific event, you're looking for the first event
> of type j, so I think perf_session__find_first_evtype is clearer.
> 
>> +
>> +		/* even if fields is set to 0 (ie., show nothing) event must
>> +		 * exist if user explicitly includes it on the command line
>> +		 */
> 
> Please use:
> 
> 		/*
>   		 * even if fields is set to 0 (ie., show nothing) event must
>   		 * exist if user explicitly includes it on the command line
>   		 */
> 
> There are other places like this, please fix those too.

Ok, I'll make the changes and resend.

David

> 
> - Arnaldo
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