[PATCH 1/2] tools/perf: Include global and local variants for p_stage_cyc sort key
Nageswara Sastry
rnsastry at linux.ibm.com
Thu Nov 25 19:10:14 AEDT 2021
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 at linux.vnet.ibm.com>
> Reported-by: Namhyung Kim <namhyung at 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 at 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
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