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 = &cpu_buffer[i];
  27                 cpu_buf->sample_received = 0;
  28                 cpu_buf->sample_lost_overflow = 0;
  29         }
  30
  31         atomic_set(&oprofile_stats.sample_lost_no_mm, 0);
  32         atomic_set(&oprofile_stats.sample_lost_no_mapping, 0);
  33         atomic_set(&oprofile_stats.event_lost_overflow, 0);
  34 }
  35
  36
  37 void oprofile_create_stats_files(struct super_block * sb, struct dentry * root)
  38 {
  39         struct oprofile_cpu_buffer * cpu_buf;
  40         struct dentry * cpudir;
  41         struct dentry * dir;
  42         char buf[10];
  43         int i;
  44
  45         dir = oprofilefs_mkdir(sb, root, "stats");
  46         if (!dir)
  47                 return;
  48
  49         for_each_possible_cpu(i) {
  50                 cpu_buf = &cpu_buffer[i];
  51                 snprintf(buf, 10, "cpu%d", i);
  52                 cpudir = oprofilefs_mkdir(sb, dir, buf);
  53
  54                 /* Strictly speaking access to these ulongs is racy,
  55                  * but we can't simply lock them, and they are
  56                  * informational only.
  57                  */
  58                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
  59                         &cpu_buf->sample_received);
  60                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
  61                         &cpu_buf->sample_lost_overflow);
  62                 oprofilefs_create_ro_ulong(sb, cpudir, "backtrace_aborted",
  63                         &cpu_buf->backtrace_aborted);
  64         }
  65
  66         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
  67                 &oprofile_stats.sample_lost_no_mm);
  68         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
  69                 &oprofile_stats.sample_lost_no_mapping);
  70         oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
  71                 &oprofile_stats.event_lost_overflow);
  72         oprofilefs_create_ro_atomic(sb, dir, "bt_lost_no_mapping",
  73                 &oprofile_stats.bt_lost_no_mapping);
  74 }