root/tools/perf/util/top.c

DEFINITIONS

1. perf_top__header_snprintf
2. perf_top__reset_sample_counters

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   4  *
   5  * Refactored from builtin-top.c, see that files for further copyright notes.
   6  */
   7 
   8 #include "event.h"
   9 #include "evlist.h"
  10 #include "evsel.h"
  11 #include "parse-events.h"
  12 #include "symbol.h"
  13 #include "top.h"
  14 #include "../perf.h"
  15 #include <inttypes.h>
  16 
  17 #define SNPRINTF(buf, size, fmt, args...) \
  18 ({ \
  19         size_t r = snprintf(buf, size, fmt, ## args); \
  20         r > size ?  size : r; \
  21 })
  22 
  23 size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size)
  24 {
  25         float samples_per_sec;
  26         float ksamples_per_sec;
  27         float esamples_percent;
  28         struct record_opts *opts = &top->record_opts;
  29         struct target *target = &opts->target;
  30         size_t ret = 0;
  31 
  32         if (top->samples) {
  33                 samples_per_sec = top->samples / top->delay_secs;
  34                 ksamples_per_sec = top->kernel_samples / top->delay_secs;
  35                 esamples_percent = (100.0 * top->exact_samples) / top->samples;
  36         } else {
  37                 samples_per_sec = ksamples_per_sec = esamples_percent = 0.0;
  38         }
  39 
  40         if (!perf_guest) {
  41                 float ksamples_percent = 0.0;
  42 
  43                 if (samples_per_sec)
  44                         ksamples_percent = (100.0 * ksamples_per_sec) /
  45                                                         samples_per_sec;
  46                 ret = SNPRINTF(bf, size,
  47                                "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%%"
  48                                "  exact: %4.1f%% lost: %" PRIu64 "/%" PRIu64 " drop: %" PRIu64 "/%" PRIu64 " [",
  49                                samples_per_sec, ksamples_percent, esamples_percent,
  50                                top->lost, top->lost_total, top->drop, top->drop_total);
  51         } else {
  52                 float us_samples_per_sec = top->us_samples / top->delay_secs;
  53                 float guest_kernel_samples_per_sec = top->guest_kernel_samples / top->delay_secs;
  54                 float guest_us_samples_per_sec = top->guest_us_samples / top->delay_secs;
  55 
  56                 ret = SNPRINTF(bf, size,
  57                                "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%% us:%4.1f%%"
  58                                " guest kernel:%4.1f%% guest us:%4.1f%%"
  59                                " exact: %4.1f%% [", samples_per_sec,
  60                                100.0 - (100.0 * ((samples_per_sec - ksamples_per_sec) /
  61                                                  samples_per_sec)),
  62                                100.0 - (100.0 * ((samples_per_sec - us_samples_per_sec) /
  63                                                  samples_per_sec)),
  64                                100.0 - (100.0 * ((samples_per_sec -
  65                                                   guest_kernel_samples_per_sec) /
  66                                                  samples_per_sec)),
  67                                100.0 - (100.0 * ((samples_per_sec -
  68                                                   guest_us_samples_per_sec) /
  69                                                  samples_per_sec)),
  70                                esamples_percent);
  71         }
  72 
  73         if (top->evlist->core.nr_entries == 1) {
  74                 struct evsel *first = evlist__first(top->evlist);
  75                 ret += SNPRINTF(bf + ret, size - ret, "%" PRIu64 "%s ",
  76                                 (uint64_t)first->core.attr.sample_period,
  77                                 opts->freq ? "Hz" : "");
  78         }
  79 
  80         ret += SNPRINTF(bf + ret, size - ret, "%s", perf_evsel__name(top->sym_evsel));
  81 
  82         ret += SNPRINTF(bf + ret, size - ret, "], ");
  83 
  84         if (target->pid)
  85                 ret += SNPRINTF(bf + ret, size - ret, " (target_pid: %s",
  86                                 target->pid);
  87         else if (target->tid)
  88                 ret += SNPRINTF(bf + ret, size - ret, " (target_tid: %s",
  89                                 target->tid);
  90         else if (target->uid_str != NULL)
  91                 ret += SNPRINTF(bf + ret, size - ret, " (uid: %s",
  92                                 target->uid_str);
  93         else
  94                 ret += SNPRINTF(bf + ret, size - ret, " (all");
  95 
  96         if (target->cpu_list)
  97                 ret += SNPRINTF(bf + ret, size - ret, ", CPU%s: %s)",
  98                                 top->evlist->core.cpus->nr > 1 ? "s" : "",
  99                                 target->cpu_list);
 100         else {
 101                 if (target->tid)
 102                         ret += SNPRINTF(bf + ret, size - ret, ")");
 103                 else
 104                         ret += SNPRINTF(bf + ret, size - ret, ", %d CPU%s)",
 105                                         top->evlist->core.cpus->nr,
 106                                         top->evlist->core.cpus->nr > 1 ? "s" : "");
 107         }
 108 
 109         perf_top__reset_sample_counters(top);
 110         return ret;
 111 }
 112 
 113 void perf_top__reset_sample_counters(struct perf_top *top)
 114 {
 115         top->samples = top->us_samples = top->kernel_samples =
 116         top->exact_samples = top->guest_kernel_samples =
 117         top->guest_us_samples = top->lost = top->drop = 0;
 118 }