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Date:   Thu, 28 Feb 2019 14:57:01 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH] perf util: Refactor time range parsing code

Em Thu, Feb 28, 2019 at 10:30:09PM +0800, Jin Yao escreveu:
> Jiri points out that we don't need any time checking and time string
> parsing if the --time option is not set. That makes sense.
> 
> This patch refactors the time range parsing code, move the duplicated
> code from perf report and perf script to time_utils and check if --time
> option is set before parsing the time string.

So, this should come with a "No logic change expected", but I'd say that
for this to be more quickly/easily tested, please provide intructions
about how to test that this indeed didn't change anything inadvertently.

Simply looking at the code should be enough, but having instructions on
how to use this helps in testing and advertises further the feature.

I.e. try not to lose an opportunity to teach about these perf features
:-)

- Arnaldo
 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
>  tools/perf/builtin-report.c  | 38 +++++++--------------------------
>  tools/perf/builtin-script.c  | 39 +++++++--------------------------
>  tools/perf/util/time-utils.c | 51 +++++++++++++++++++++++++++++++++++++++++++-
>  tools/perf/util/time-utils.h |  6 ++++++
>  4 files changed, 72 insertions(+), 62 deletions(-)
> 
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index 1532ebd..ee93c18 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -1375,36 +1375,13 @@ int cmd_report(int argc, const char **argv)
>  	if (symbol__init(&session->header.env) < 0)
>  		goto error;
>  
> -	report.ptime_range = perf_time__range_alloc(report.time_str,
> -						    &report.range_size);
> -	if (!report.ptime_range) {
> -		ret = -ENOMEM;
> -		goto error;
> -	}
> -
> -	if (perf_time__parse_str(report.ptime_range, report.time_str) != 0) {
> -		if (session->evlist->first_sample_time == 0 &&
> -		    session->evlist->last_sample_time == 0) {
> -			pr_err("HINT: no first/last sample time found in perf data.\n"
> -			       "Please use latest perf binary to execute 'perf record'\n"
> -			       "(if '--buildid-all' is enabled, please set '--timestamp-boundary').\n");
> -			ret = -EINVAL;
> -			goto error;
> -		}
> -
> -		report.range_num = perf_time__percent_parse_str(
> -					report.ptime_range, report.range_size,
> -					report.time_str,
> -					session->evlist->first_sample_time,
> -					session->evlist->last_sample_time);
> -
> -		if (report.range_num < 0) {
> -			pr_err("Invalid time string\n");
> -			ret = -EINVAL;
> +	if (report.time_str) {
> +		ret = perf_time__parse_for_ranges(report.time_str, session,
> +						  &report.ptime_range,
> +						  &report.range_size,
> +						  &report.range_num);
> +		if (ret < 0)
>  			goto error;
> -		}
> -	} else {
> -		report.range_num = 1;
>  	}
>  
>  	if (session->tevent.pevent &&
> @@ -1426,7 +1403,8 @@ int cmd_report(int argc, const char **argv)
>  		ret = 0;
>  
>  error:
> -	zfree(&report.ptime_range);
> +	if (report.ptime_range)
> +		zfree(&report.ptime_range);
>  
>  	perf_session__delete(session);
>  	return ret;
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 2d8cb1d..53f78cf 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -3699,37 +3699,13 @@ int cmd_script(int argc, const char **argv)
>  	if (err < 0)
>  		goto out_delete;
>  
> -	script.ptime_range = perf_time__range_alloc(script.time_str,
> -						    &script.range_size);
> -	if (!script.ptime_range) {
> -		err = -ENOMEM;
> -		goto out_delete;
> -	}
> -
> -	/* needs to be parsed after looking up reference time */
> -	if (perf_time__parse_str(script.ptime_range, script.time_str) != 0) {
> -		if (session->evlist->first_sample_time == 0 &&
> -		    session->evlist->last_sample_time == 0) {
> -			pr_err("HINT: no first/last sample time found in perf data.\n"
> -			       "Please use latest perf binary to execute 'perf record'\n"
> -			       "(if '--buildid-all' is enabled, please set '--timestamp-boundary').\n");
> -			err = -EINVAL;
> -			goto out_delete;
> -		}
> -
> -		script.range_num = perf_time__percent_parse_str(
> -					script.ptime_range, script.range_size,
> -					script.time_str,
> -					session->evlist->first_sample_time,
> -					session->evlist->last_sample_time);
> -
> -		if (script.range_num < 0) {
> -			pr_err("Invalid time string\n");
> -			err = -EINVAL;
> +	if (script.time_str) {
> +		err = perf_time__parse_for_ranges(script.time_str, session,
> +						  &script.ptime_range,
> +						  &script.range_size,
> +						  &script.range_num);
> +		if (err < 0)
>  			goto out_delete;
> -		}
> -	} else {
> -		script.range_num = 1;
>  	}
>  
>  	err = __cmd_script(&script);
> @@ -3737,7 +3713,8 @@ int cmd_script(int argc, const char **argv)
>  	flush_scripting();
>  
>  out_delete:
> -	zfree(&script.ptime_range);
> +	if (script.ptime_range)
> +		zfree(&script.ptime_range);
>  
>  	perf_evlist__free_stats(session->evlist);
>  	perf_session__delete(session);
> diff --git a/tools/perf/util/time-utils.c b/tools/perf/util/time-utils.c
> index 6193b46..0f53bae 100644
> --- a/tools/perf/util/time-utils.c
> +++ b/tools/perf/util/time-utils.c
> @@ -11,6 +11,8 @@
>  #include "perf.h"
>  #include "debug.h"
>  #include "time-utils.h"
> +#include "session.h"
> +#include "evlist.h"
>  
>  int parse_nsec_time(const char *str, u64 *ptime)
>  {
> @@ -374,7 +376,7 @@ bool perf_time__ranges_skip_sample(struct perf_time_interval *ptime_buf,
>  	struct perf_time_interval *ptime;
>  	int i;
>  
> -	if ((timestamp == 0) || (num == 0))
> +	if ((!ptime_buf) || (timestamp == 0) || (num == 0))
>  		return false;
>  
>  	if (num == 1)
> @@ -396,6 +398,53 @@ bool perf_time__ranges_skip_sample(struct perf_time_interval *ptime_buf,
>  	return (i == num) ? true : false;
>  }
>  
> +int perf_time__parse_for_ranges(const char *time_str,
> +				struct perf_session *session,
> +				struct perf_time_interval **ranges,
> +				int *range_size, int *range_num)
> +{
> +	struct perf_time_interval *ptime_range;
> +	int size, num, ret;
> +
> +	ptime_range = perf_time__range_alloc(time_str, &size);
> +	if (!ptime_range)
> +		return -ENOMEM;
> +
> +	if (perf_time__parse_str(ptime_range, time_str) != 0) {
> +		if (session->evlist->first_sample_time == 0 &&
> +		    session->evlist->last_sample_time == 0) {
> +			pr_err("HINT: no first/last sample time found in perf data.\n"
> +			       "Please use latest perf binary to execute 'perf record'\n"
> +			       "(if '--buildid-all' is enabled, please set '--timestamp-boundary').\n");
> +			ret = -EINVAL;
> +			goto error;
> +		}
> +
> +		num = perf_time__percent_parse_str(
> +				ptime_range, size,
> +				time_str,
> +				session->evlist->first_sample_time,
> +				session->evlist->last_sample_time);
> +
> +		if (num < 0) {
> +			pr_err("Invalid time string\n");
> +			ret = -EINVAL;
> +			goto error;
> +		}
> +	} else {
> +		num = 1;
> +	}
> +
> +	*range_size = size;
> +	*range_num = num;
> +	*ranges = ptime_range;
> +	return 0;
> +
> +error:
> +	free(ptime_range);
> +	return ret;
> +}
> +
>  int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz)
>  {
>  	u64  sec = timestamp / NSEC_PER_SEC;
> diff --git a/tools/perf/util/time-utils.h b/tools/perf/util/time-utils.h
> index 70b177d..b923de4 100644
> --- a/tools/perf/util/time-utils.h
> +++ b/tools/perf/util/time-utils.h
> @@ -23,6 +23,12 @@ bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp);
>  bool perf_time__ranges_skip_sample(struct perf_time_interval *ptime_buf,
>  				   int num, u64 timestamp);
>  
> +struct perf_session;
> +
> +int perf_time__parse_for_ranges(const char *str, struct perf_session *session,
> +				struct perf_time_interval **ranges,
> +				int *range_size, int *range_num);
> +
>  int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz);
>  
>  int fetch_current_timestamp(char *buf, size_t sz);
> -- 
> 2.7.4

-- 

- Arnaldo

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