drivers/oprofile/oprofile_stats.c

   1 /**
   2  * @file oprofile_stats.c
   3  *
   4  * @remark Copyright 2002 OProfile authors
   5  * @remark Read the file COPYING
   6  *
   7  * @author John Levon
   8  */
   9
  10 #include <linux/oprofile.h>
  11 #include <linux/smp.h>
  12 #include <linux/cpumask.h>
  13 #include <linux/threads.h>
  14
  15 #include "oprofile_stats.h"
  16 #include "cpu_buffer.h"
  17
  18 struct oprofile_stat_struct oprofile_stats;
  19
  20 void oprofile_reset_stats(void)
  21 {
  22         struct oprofile_cpu_buffer *cpu_buf;
  23         int i;
  24
  25         for_each_possible_cpu(i) {
  26                 cpu_buf = &per_cpu(op_cpu_buffer, i);
  27                 cpu_buf->sample_received = 0;
  28                 cpu_buf->sample_lost_overflow = 0;
  29                 cpu_buf->backtrace_aborted = 0;
  30                 cpu_buf->sample_invalid_eip = 0;
  31         }
  32
  33         atomic_set(&oprofile_stats.sample_lost_no_mm, 0);
  34         atomic_set(&oprofile_stats.sample_lost_no_mapping, 0);
  35         atomic_set(&oprofile_stats.event_lost_overflow, 0);
  36         atomic_set(&oprofile_stats.bt_lost_no_mapping, 0);
  37         atomic_set(&oprofile_stats.multiplex_counter, 0);
  38 }
  39
  40
  41 void oprofile_create_stats_files(struct dentry *root)
  42 {
  43         struct oprofile_cpu_buffer *cpu_buf;
  44         struct dentry *cpudir;
  45         struct dentry *dir;
  46         char buf[10];
  47         int i;
  48
  49         dir = oprofilefs_mkdir(root, "stats");
  50         if (!dir)
  51                 return;
  52
  53         for_each_possible_cpu(i) {
  54                 cpu_buf = &per_cpu(op_cpu_buffer, i);
  55                 snprintf(buf, 10, "cpu%d", i);
  56                 cpudir = oprofilefs_mkdir(dir, buf);
  57
  58                 /* Strictly speaking access to these ulongs is racy,
  59                  * but we can't simply lock them, and they are
  60                  * informational only.
  61                  */
  62                 oprofilefs_create_ro_ulong(cpudir, "sample_received",
  63                         &cpu_buf->sample_received);
  64                 oprofilefs_create_ro_ulong(cpudir, "sample_lost_overflow",
  65                         &cpu_buf->sample_lost_overflow);
  66                 oprofilefs_create_ro_ulong(cpudir, "backtrace_aborted",
  67                         &cpu_buf->backtrace_aborted);
  68                 oprofilefs_create_ro_ulong(cpudir, "sample_invalid_eip",
  69                         &cpu_buf->sample_invalid_eip);
  70         }
  71
  72         oprofilefs_create_ro_atomic(dir, "sample_lost_no_mm",
  73                 &oprofile_stats.sample_lost_no_mm);
  74         oprofilefs_create_ro_atomic(dir, "sample_lost_no_mapping",
  75                 &oprofile_stats.sample_lost_no_mapping);
  76         oprofilefs_create_ro_atomic(dir, "event_lost_overflow",
  77                 &oprofile_stats.event_lost_overflow);
  78         oprofilefs_create_ro_atomic(dir, "bt_lost_no_mapping",
  79                 &oprofile_stats.bt_lost_no_mapping);
  80 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
  81         oprofilefs_create_ro_atomic(dir, "multiplex_counter",
  82                 &oprofile_stats.multiplex_counter);
  83 #endif
  84 }