Linux Kernel  3.7.1
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top.c
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1 /*
2  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <[email protected]>
3  *
4  * Refactored from builtin-top.c, see that files for further copyright notes.
5  *
6  * Released under the GPL v2. (and only v2, not any later version)
7  */
8 
9 #include "cpumap.h"
10 #include "event.h"
11 #include "evlist.h"
12 #include "evsel.h"
13 #include "parse-events.h"
14 #include "symbol.h"
15 #include "top.h"
16 #include <inttypes.h>
17 
18 #define SNPRINTF(buf, size, fmt, args...) \
19 ({ \
20  size_t r = snprintf(buf, size, fmt, ## args); \
21  r > size ? size : r; \
22 })
23 
24 size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size)
25 {
26  float samples_per_sec = top->samples / top->delay_secs;
27  float ksamples_per_sec = top->kernel_samples / top->delay_secs;
28  float esamples_percent = (100.0 * top->exact_samples) / top->samples;
29  size_t ret = 0;
30 
31  if (!perf_guest) {
32  ret = SNPRINTF(bf, size,
33  " PerfTop:%8.0f irqs/sec kernel:%4.1f%%"
34  " exact: %4.1f%% [", samples_per_sec,
35  100.0 - (100.0 * ((samples_per_sec - ksamples_per_sec) /
36  samples_per_sec)),
37  esamples_percent);
38  } else {
39  float us_samples_per_sec = top->us_samples / top->delay_secs;
40  float guest_kernel_samples_per_sec = top->guest_kernel_samples / top->delay_secs;
41  float guest_us_samples_per_sec = top->guest_us_samples / top->delay_secs;
42 
43  ret = SNPRINTF(bf, size,
44  " PerfTop:%8.0f irqs/sec kernel:%4.1f%% us:%4.1f%%"
45  " guest kernel:%4.1f%% guest us:%4.1f%%"
46  " exact: %4.1f%% [", samples_per_sec,
47  100.0 - (100.0 * ((samples_per_sec - ksamples_per_sec) /
48  samples_per_sec)),
49  100.0 - (100.0 * ((samples_per_sec - us_samples_per_sec) /
50  samples_per_sec)),
51  100.0 - (100.0 * ((samples_per_sec -
52  guest_kernel_samples_per_sec) /
53  samples_per_sec)),
54  100.0 - (100.0 * ((samples_per_sec -
55  guest_us_samples_per_sec) /
56  samples_per_sec)),
57  esamples_percent);
58  }
59 
60  if (top->evlist->nr_entries == 1) {
61  struct perf_evsel *first = perf_evlist__first(top->evlist);
62  ret += SNPRINTF(bf + ret, size - ret, "%" PRIu64 "%s ",
63  (uint64_t)first->attr.sample_period,
64  top->freq ? "Hz" : "");
65  }
66 
67  ret += SNPRINTF(bf + ret, size - ret, "%s", perf_evsel__name(top->sym_evsel));
68 
69  ret += SNPRINTF(bf + ret, size - ret, "], ");
70 
71  if (top->target.pid)
72  ret += SNPRINTF(bf + ret, size - ret, " (target_pid: %s",
73  top->target.pid);
74  else if (top->target.tid)
75  ret += SNPRINTF(bf + ret, size - ret, " (target_tid: %s",
76  top->target.tid);
77  else if (top->target.uid_str != NULL)
78  ret += SNPRINTF(bf + ret, size - ret, " (uid: %s",
79  top->target.uid_str);
80  else
81  ret += SNPRINTF(bf + ret, size - ret, " (all");
82 
83  if (top->target.cpu_list)
84  ret += SNPRINTF(bf + ret, size - ret, ", CPU%s: %s)",
85  top->evlist->cpus->nr > 1 ? "s" : "",
86  top->target.cpu_list);
87  else {
88  if (top->target.tid)
89  ret += SNPRINTF(bf + ret, size - ret, ")");
90  else
91  ret += SNPRINTF(bf + ret, size - ret, ", %d CPU%s)",
92  top->evlist->cpus->nr,
93  top->evlist->cpus->nr > 1 ? "s" : "");
94  }
95 
96  return ret;
97 }
98 
100 {
101  top->samples = top->us_samples = top->kernel_samples =
102  top->exact_samples = top->guest_kernel_samples =
103  top->guest_us_samples = 0;
104 }