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

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Date:   Fri, 12 Mar 2021 13:57:03 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, mpe@...erman.id.au,
        acme@...nel.org, jolsa@...nel.org, 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 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

> +{
> +	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
>