Re: [PATCH 1/2] tools/perf: Include global and local variants for p_stage_cyc sort key

[Nageswara Sastry <rnsastry@linux.ibm.com>]

On 25/11/21 8:18 am, Athira Rajeev wrote:
> Sort key p_stage_cyc is used to present the latency
> cycles spend in pipeline stages. perf tool has local
> p_stage_cyc sort key to display this info. There is no
> global variant available for this sort key. local variant
> shows latency in a sinlge sample, whereas, global value
> will be useful to present the total latency (sum of
> latencies) in the hist entry. It represents latency
> number multiplied by the number of samples.
> 
> Add global (p_stage_cyc) and local variant
> (local_p_stage_cyc) for this sort key. Use the
> local_p_stage_cyc as default option for "mem" sort mode.
> Also add this to list of dynamic sort keys.
> 
> Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
> Reported-by: Namhyung Kim <namhyung@kernel.org>

Tested the patch on Power10 LPAR and could see the required data.

# Overhead       Samples  Command  Shared Object               Symbol 
                              Dispatch Cyc
# ........  ............  .......  .......................... 
....................................  .............
#
      9.41%           156  dd       [kernel.vmlinux]            [k] 
system_call_common                1
      4.91%            82  dd       [kernel.vmlinux]            [k] 
__fget_light                      1
...

# Overhead       Samples  Command  Shared Object               Symbol 
                              Dispatch Cyc   Global Dispatch_cyc
# ........  ............  .......  .......................... 
....................................  .............  ...................
#
      9.41%           156  dd       [kernel.vmlinux]            [k] 
system_call_common                1              156
      4.91%            82  dd       [kernel.vmlinux]            [k] 
__fget_light                      1              82
...

Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com>

> ---
>   tools/perf/util/hist.c |  4 +++-
>   tools/perf/util/hist.h |  3 ++-
>   tools/perf/util/sort.c | 34 +++++++++++++++++++++++++---------
>   tools/perf/util/sort.h |  3 ++-
>   4 files changed, 32 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index b776465e04ef..0a8033b09e28 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -211,7 +211,9 @@ void hists__calc_col_len(struct hists *hists, struct hist_entry *h)
>   	hists__new_col_len(hists, HISTC_MEM_BLOCKED, 10);
>   	hists__new_col_len(hists, HISTC_LOCAL_INS_LAT, 13);
>   	hists__new_col_len(hists, HISTC_GLOBAL_INS_LAT, 13);
> -	hists__new_col_len(hists, HISTC_P_STAGE_CYC, 13);
> +	hists__new_col_len(hists, HISTC_LOCAL_P_STAGE_CYC, 13);
> +	hists__new_col_len(hists, HISTC_GLOBAL_P_STAGE_CYC, 13);
> +
>   	if (symbol_conf.nanosecs)
>   		hists__new_col_len(hists, HISTC_TIME, 16);
>   	else
> diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
> index 5343b62476e6..2752ce681108 100644
> --- a/tools/perf/util/hist.h
> +++ b/tools/perf/util/hist.h
> @@ -75,7 +75,8 @@ enum hist_column {
>   	HISTC_MEM_BLOCKED,
>   	HISTC_LOCAL_INS_LAT,
>   	HISTC_GLOBAL_INS_LAT,
> -	HISTC_P_STAGE_CYC,
> +	HISTC_LOCAL_P_STAGE_CYC,
> +	HISTC_GLOBAL_P_STAGE_CYC,
>   	HISTC_NR_COLS, /* Last entry */
>   };
>   
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index e9216a292a04..e978f7883e07 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -37,7 +37,7 @@ const char	default_parent_pattern[] = "^sys_|^do_page_fault";
>   const char	*parent_pattern = default_parent_pattern;
>   const char	*default_sort_order = "comm,dso,symbol";
>   const char	default_branch_sort_order[] = "comm,dso_from,symbol_from,symbol_to,cycles";
> -const char	default_mem_sort_order[] = "local_weight,mem,sym,dso,symbol_daddr,dso_daddr,snoop,tlb,locked,blocked,local_ins_lat,p_stage_cyc";
> +const char	default_mem_sort_order[] = "local_weight,mem,sym,dso,symbol_daddr,dso_daddr,snoop,tlb,locked,blocked,local_ins_lat,local_p_stage_cyc";
>   const char	default_top_sort_order[] = "dso,symbol";
>   const char	default_diff_sort_order[] = "dso,symbol";
>   const char	default_tracepoint_sort_order[] = "trace";
> @@ -46,8 +46,8 @@ const char	*field_order;
>   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", "p_stage_cyc"};
> -const char	*arch_specific_sort_keys[] = {"p_stage_cyc"};
> +const char	*dynamic_headers[] = {"local_ins_lat", "ins_lat", "local_p_stage_cyc", "p_stage_cyc"};
> +const char	*arch_specific_sort_keys[] = {"local_p_stage_cyc", "p_stage_cyc"};
>   
>   /*
>    * Replaces all occurrences of a char used with the:
> @@ -1392,22 +1392,37 @@ struct sort_entry sort_global_ins_lat = {
>   };
>   
>   static int64_t
> -sort__global_p_stage_cyc_cmp(struct hist_entry *left, struct hist_entry *right)
> +sort__p_stage_cyc_cmp(struct hist_entry *left, struct hist_entry *right)
>   {
>   	return left->p_stage_cyc - right->p_stage_cyc;
>   }
>   
> +static int hist_entry__global_p_stage_cyc_snprintf(struct hist_entry *he, char *bf,
> +					size_t size, unsigned int width)
> +{
> +	return repsep_snprintf(bf, size, "%-*u", width,
> +			he->p_stage_cyc * he->stat.nr_events);
> +}
> +
> +
>   static int hist_entry__p_stage_cyc_snprintf(struct hist_entry *he, char *bf,
>   					size_t size, unsigned int width)
>   {
>   	return repsep_snprintf(bf, size, "%-*u", width, he->p_stage_cyc);
>   }
>   
> -struct sort_entry sort_p_stage_cyc = {
> -	.se_header      = "Pipeline Stage Cycle",
> -	.se_cmp         = sort__global_p_stage_cyc_cmp,
> +struct sort_entry sort_local_p_stage_cyc = {
> +	.se_header      = "Local Pipeline Stage Cycle",
> +	.se_cmp         = sort__p_stage_cyc_cmp,
>   	.se_snprintf	= hist_entry__p_stage_cyc_snprintf,
> -	.se_width_idx	= HISTC_P_STAGE_CYC,
> +	.se_width_idx	= HISTC_LOCAL_P_STAGE_CYC,
> +};
> +
> +struct sort_entry sort_global_p_stage_cyc = {
> +	.se_header      = "Pipeline Stage Cycle",
> +	.se_cmp         = sort__p_stage_cyc_cmp,
> +	.se_snprintf    = hist_entry__global_p_stage_cyc_snprintf,
> +	.se_width_idx   = HISTC_GLOBAL_P_STAGE_CYC,
>   };
>   
>   struct sort_entry sort_mem_daddr_sym = {
> @@ -1858,7 +1873,8 @@ static struct sort_dimension common_sort_dimensions[] = {
>   	DIM(SORT_CODE_PAGE_SIZE, "code_page_size", sort_code_page_size),
>   	DIM(SORT_LOCAL_INS_LAT, "local_ins_lat", sort_local_ins_lat),
>   	DIM(SORT_GLOBAL_INS_LAT, "ins_lat", sort_global_ins_lat),
> -	DIM(SORT_PIPELINE_STAGE_CYC, "p_stage_cyc", sort_p_stage_cyc),
> +	DIM(SORT_LOCAL_PIPELINE_STAGE_CYC, "local_p_stage_cyc", sort_local_p_stage_cyc),
> +	DIM(SORT_GLOBAL_PIPELINE_STAGE_CYC, "p_stage_cyc", sort_global_p_stage_cyc),
>   };
>   
>   #undef DIM
> diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
> index 3c7518378d62..83abe5e6812a 100644
> --- a/tools/perf/util/sort.h
> +++ b/tools/perf/util/sort.h
> @@ -235,7 +235,8 @@ enum sort_type {
>   	SORT_CODE_PAGE_SIZE,
>   	SORT_LOCAL_INS_LAT,
>   	SORT_GLOBAL_INS_LAT,
> -	SORT_PIPELINE_STAGE_CYC,
> +	SORT_LOCAL_PIPELINE_STAGE_CYC,
> +	SORT_GLOBAL_PIPELINE_STAGE_CYC,
>   
>   	/* branch stack specific sort keys */
>   	__SORT_BRANCH_STACK,
> 

-- 
Thanks and Regards
R.Nageswara Sastry