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(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 }
  38
  39
  40 void oprofile_create_stats_files(struct super_block *sb, struct dentry *root)
  41 {
  42         struct oprofile_cpu_buffer *cpu_buf;
  43         struct dentry *cpudir;
  44         struct dentry *dir;
  45         char buf[10];
  46         int i;
  47
  48         dir = oprofilefs_mkdir(sb, root, "stats");
  49         if (!dir)
  50                 return;
  51
  52         for_each_possible_cpu(i) {
  53                 cpu_buf = &per_cpu(cpu_buffer, i);
  54                 snprintf(buf, 10, "cpu%d", i);
  55                 cpudir = oprofilefs_mkdir(sb, dir, buf);
  56
  57                 /* Strictly speaking access to these ulongs is racy,
  58                  * but we can't simply lock them, and they are
  59                  * informational only.
  60                  */
  61                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
  62                         &cpu_buf->sample_received);
  63                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
  64                         &cpu_buf->sample_lost_overflow);
  65                 oprofilefs_create_ro_ulong(sb, cpudir, "backtrace_aborted",
  66                         &cpu_buf->backtrace_aborted);
  67                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_invalid_eip",
  68                         &cpu_buf->sample_invalid_eip);
  69         }
  70
  71         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
  72                 &oprofile_stats.sample_lost_no_mm);
  73         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
  74                 &oprofile_stats.sample_lost_no_mapping);
  75         oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
  76                 &oprofile_stats.event_lost_overflow);
  77         oprofilefs_create_ro_atomic(sb, dir, "bt_lost_no_mapping",
  78                 &oprofile_stats.bt_lost_no_mapping);
  79 }