linux-kernel - Re: [PATCH 2/4] tools/perf: Add dynamic headers for perf report columns

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Message-Id: <82153A58-31F2-44ED-9326-EF1F74ADDA91@linux.vnet.ibm.com>
Date:   Mon, 15 Mar 2021 13:11:38 +0530
From:   Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        jolsa@...nel.org, Madhavan Srinivasan <maddy@...ux.ibm.com>,
        ravi.bangoria@...ux.ibm.com, kjain@...ux.ibm.com,
        kan.liang@...ux.intel.com, peterz@...radead.org
Subject: Re: [PATCH 2/4] tools/perf: Add dynamic headers for perf report
 columns



> On 12-Mar-2021, at 6:27 PM, Jiri Olsa <jolsa@...hat.com> wrote:
> 
> On Tue, Mar 09, 2021 at 09:03:58AM -0500, Athira Rajeev wrote:
>> Currently the header string for different columns in perf report
>> is fixed. Some fields of perf sample could have different meaning
>> for different architectures than the meaning conveyed by the header
>> string. An example is the new field 'var2_w' of perf_sample_weight
>> structure. This is presently captured as 'Local INSTR Latency' in
>> perf mem report. But this could be used to denote a different latency
>> cycle in another architecture.
>> 
>> Introduce a weak function arch_perf_header_entry__add() to set
>> the arch specific header string for the fields which can contain dynamic
>> header. If the architecture do not have this function, fall back to the
>> default header string value.
>> 
>> Signed-off-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
>> ---
>> tools/perf/util/event.h |  1 +
>> tools/perf/util/sort.c  | 19 ++++++++++++++++++-
>> 2 files changed, 19 insertions(+), 1 deletion(-)
>> 
>> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
>> index f603edbbbc6f..89b149e2e70a 100644
>> --- a/tools/perf/util/event.h
>> +++ b/tools/perf/util/event.h
>> @@ -427,5 +427,6 @@ void  cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct per
>> 
>> void arch_perf_parse_sample_weight(struct perf_sample *data, const __u64 *array, u64 type);
>> void arch_perf_synthesize_sample_weight(const struct perf_sample *data, __u64 *array, u64 type);
>> +const char *arch_perf_header_entry__add(const char *se_header);
>> 
>> #endif /* __PERF_RECORD_H */
>> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
>> index 0d5ad42812b9..741a6df29fa0 100644
>> --- a/tools/perf/util/sort.c
>> +++ b/tools/perf/util/sort.c
>> @@ -25,6 +25,7 @@
>> #include <traceevent/event-parse.h>
>> #include "mem-events.h"
>> #include "annotate.h"
>> +#include "event.h"
>> #include "time-utils.h"
>> #include "cgroup.h"
>> #include "machine.h"
>> @@ -45,6 +46,7 @@
>> regex_t		ignore_callees_regex;
>> int		have_ignore_callees = 0;
>> enum sort_mode	sort__mode = SORT_MODE__NORMAL;
>> +const char	*dynamic_headers[] = {"local_ins_lat"};
>> 
>> /*
>>  * Replaces all occurrences of a char used with the:
>> @@ -1816,6 +1818,16 @@ struct sort_dimension {
>> 	int			taken;
>> };
>> 
>> +const char * __weak arch_perf_header_entry__add(const char *se_header)
> 
> no need for the __add suffix in here
> 
> jirka
> 

Thanks Jiri for the review.

I will include this change in next version.

Thanks
Athira

>> +{
>> +	return se_header;
>> +}
>> +
>> +static void sort_dimension_add_dynamic_header(struct sort_dimension *sd)
>> +{
>> +	sd->entry->se_header = arch_perf_header_entry__add(sd->entry->se_header);
>> +}
>> +
>> #define DIM(d, n, func) [d] = { .name = n, .entry = &(func) }
>> 
>> static struct sort_dimension common_sort_dimensions[] = {
>> @@ -2739,11 +2751,16 @@ int sort_dimension__add(struct perf_hpp_list *list, const char *tok,
>> 			struct evlist *evlist,
>> 			int level)
>> {
>> -	unsigned int i;
>> +	unsigned int i, j;
>> 
>> 	for (i = 0; i < ARRAY_SIZE(common_sort_dimensions); i++) {
>> 		struct sort_dimension *sd = &common_sort_dimensions[i];
>> 
>> +		for (j = 0; j < ARRAY_SIZE(dynamic_headers); j++) {
>> +			if (!strcmp(dynamic_headers[j], sd->name))
>> +				sort_dimension_add_dynamic_header(sd);
>> +		}
>> +
>> 		if (strncasecmp(tok, sd->name, strlen(tok)))
>> 			continue;
>> 
>> -- 
>> 1.8.3.1