linux-kernel - Re: [PATCH v3 5/6] perf report: support time percent and multiple time ranges

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Date:   Mon, 2 Oct 2017 13:52:11 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, 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 v3 5/6] perf report: support time percent and multiple
 time ranges

On Thu, Sep 28, 2017 at 08:45:20PM +0800, Jin Yao wrote:
> perf report has a --time option to limit the time range of output.
> It only supports absolute time.
> 
> Now this option is extended to support multiple time ranges and
> support the percent of time.
> 
> For example:
> 
> 1. Select the first and second 10% time slices
> perf report --time 10%/1,10%/2

hum, this one passes:

[jolsa@...va perf]$ ./perf script --time 10%/10x12321xsdfdasfdsafdsafdsa
             yes 20923 218485.067881:    9263754 cycles:ppp:  ffffffffa4263cca __vfs_write ([kernel.kallsyms])
             yes 20923 218485.070805: 6734429666984 cycles:ppp:  ffffffffa42659e3 sys_write ([kernel.kallsyms])
             yes 20923 218485.181272:    6927427 cycles:ppp:  ffffffffa42643b3 vfs_write ([kernel.kallsyms])
             yes 20923 218485.183446: 7696489147307 cycles:ppp:  ffffffffa442a9ee lockref_put_return ([kernel.kallsyms])
             yes 20923 218485.292921:    9265358 cycles:ppp:      5648b27c63b0 _init (/usr/bin/yes)
             yes 20923 218485.295866: 6734429665913 cycles:ppp:  ffffffffa42641b7 rw_verify_area ([kernel.kallsyms])
             yes 20923 218485.406225:    6930289 cycles:ppp:  ffffffffa42ab8dd __fsnotify_parent ([kernel.kallsyms])
             yes 20923 218485.408399: 7696489149499 cycles:ppp:  ffffffffa426418f rw_verify_area ([kernel.kallsyms])
             yes 20923 218485.517885:    9266280 cycles:ppp:  ffffffffa42ab926 __fsnotify_parent ([kernel.kallsyms])
             yes 20923 218485.520860: 6734429663933 cycles:ppp:      5648b27c6ccb full_write (/usr/bin/yes)

please add a test for this

jirka

> 
> 2. Select from 0% to 10% and 30% to 40% slices
> perf report --time 0%-10%,30%-40%
> 
> Change log:
> -----------
> v3: Since the definitions of first_sample_time/last_sample_time
>     are moved from perf_session to perf_evlist so change the
>     related code.
> 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
>  tools/perf/Documentation/perf-report.txt | 16 ++++++++++++++++
>  tools/perf/builtin-report.c              | 24 ++++++++++++++++++++++--
>  2 files changed, 38 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
> index 383a98d..3a0975c 100644
> --- a/tools/perf/Documentation/perf-report.txt
> +++ b/tools/perf/Documentation/perf-report.txt
> @@ -402,6 +402,22 @@ OPTIONS
>  	stop time is not given (i.e, time string is 'x.y,') then analysis goes
>  	to end of file.
>  
> +	Also support time percent with multipe time range. Time string is
> +	'a%/n,b%/m,...' or 'a%-b%,c%-%d,...'. The maximum number of slices is 10.
> +
> +	For example:
> +	Select the second 10% time slice
> +	perf report --time 10%/2
> +
> +	Select from 0% to 10% time slice
> +	perf report --time 0%-10%
> +
> +	Select the first and second 10% time slices
> +	perf report --time 10%/1,10%/2
> +
> +	Select from 0% to 10% and 30% to 40% slices
> +	perf report --time 0%-10%,30%-40%
> +
>  --itrace::
>  	Options for decoding instruction tracing data. The options are:
>  
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index f9dff65..4776f85 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -51,6 +51,8 @@
>  #include <sys/stat.h>
>  #include <unistd.h>
>  
> +#define PTIME_RANGE_MAX	10
> +
>  struct report {
>  	struct perf_tool	tool;
>  	struct perf_session	*session;
> @@ -69,6 +71,8 @@ struct report {
>  	const char		*symbol_filter_str;
>  	const char		*time_str;
>  	struct perf_time_interval ptime;
> +	struct perf_time_interval ptime_range[PTIME_RANGE_MAX];
> +	int			range_num;
>  	float			min_percent;
>  	u64			nr_entries;
>  	u64			queue_size;
> @@ -185,8 +189,11 @@ static int process_sample_event(struct perf_tool *tool,
>  	};
>  	int ret = 0;
>  
> -	if (perf_time__skip_sample(&rep->ptime, sample->time))
> +	if (perf_time__skip_sample(&rep->ptime, sample->time) ||
> +	    perf_time__ranges_skip_sample(rep->ptime_range, rep->range_num,
> +					  sample->time)) {
>  		return 0;
> +	}
>  
>  	if (machine__resolve(machine, &al, sample) < 0) {
>  		pr_debug("problem processing %d event, skipping it.\n",
> @@ -1074,7 +1081,20 @@ int cmd_report(int argc, const char **argv)
>  		goto error;
>  
>  	if (perf_time__parse_str(&report.ptime, report.time_str) != 0) {
> -		pr_err("Invalid time string\n");
> +		report.range_num = perf_time__percent_parse_str(
> +					report.ptime_range, PTIME_RANGE_MAX,
> +					report.time_str,
> +					session->evlist->first_sample_time,
> +					session->evlist->last_sample_time);
> +
> +		if (report.range_num < 0) {
> +			pr_err("Invalid time string\n");
> +			return -EINVAL;
> +		}
> +	}
> +
> +	if (report.range_num > 0 && perf_data_file__is_pipe(session->file)) {
> +		pr_err("Time percent range is not supported in pipe\n");
>  		return -EINVAL;
>  	}
>  
> -- 
> 2.7.4
>