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 (i = 0; i < NR_CPUS; ++i) {
  26                 if (!cpu_possible(i))
  27                         continue;
  28
  29                 cpu_buf = &cpu_buffer[i];
  30                 cpu_buf->sample_received = 0;
  31                 cpu_buf->sample_lost_overflow = 0;
  32                 cpu_buf->sample_lost_task_exit = 0;
  33         }
  34
  35         atomic_set(&oprofile_stats.sample_lost_no_mm, 0);
  36         atomic_set(&oprofile_stats.sample_lost_no_mapping, 0);
  37         atomic_set(&oprofile_stats.event_lost_overflow, 0);
  38 }
  39
  40
  41 void oprofile_create_stats_files(struct super_block * sb, 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(sb, root, "stats");
  50         if (!dir)
  51                 return;
  52
  53         for (i = 0; i < NR_CPUS; ++i) {
  54                 if (!cpu_possible(i))
  55                         continue;
  56
  57                 cpu_buf = &cpu_buffer[i];
  58                 snprintf(buf, 10, "cpu%d", i);
  59                 cpudir = oprofilefs_mkdir(sb, dir, buf);
  60
  61                 /* Strictly speaking access to these ulongs is racy,
  62                  * but we can't simply lock them, and they are
  63                  * informational only.
  64                  */
  65                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
  66                         &cpu_buf->sample_received);
  67                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
  68                         &cpu_buf->sample_lost_overflow);
  69                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_task_exit",
  70                         &cpu_buf->sample_lost_task_exit);
  71         }
  72
  73         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
  74                 &oprofile_stats.sample_lost_no_mm);
  75         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
  76                 &oprofile_stats.sample_lost_no_mapping);
  77         oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
  78                 &oprofile_stats.event_lost_overflow);
  79 }