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 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
  20 atomic_t multiplex_counter;
  21 #endif
  22
  23 void oprofile_reset_stats(void)
  24 {
  25         struct oprofile_cpu_buffer *cpu_buf;
  26         int i;
  27
  28         for_each_possible_cpu(i) {
  29                 cpu_buf = &per_cpu(cpu_buffer, i);
  30                 cpu_buf->sample_received = 0;
  31                 cpu_buf->sample_lost_overflow = 0;
  32                 cpu_buf->backtrace_aborted = 0;
  33                 cpu_buf->sample_invalid_eip = 0;
  34         }
  35
  36         atomic_set(&oprofile_stats.sample_lost_no_mm, 0);
  37         atomic_set(&oprofile_stats.sample_lost_no_mapping, 0);
  38         atomic_set(&oprofile_stats.event_lost_overflow, 0);
  39         atomic_set(&oprofile_stats.bt_lost_no_mapping, 0);
  40 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
  41         atomic_set(&multiplex_counter, 0);
  42 #endif
  43 }
  44
  45
  46 void oprofile_create_stats_files(struct super_block *sb, struct dentry *root)
  47 {
  48         struct oprofile_cpu_buffer *cpu_buf;
  49         struct dentry *cpudir;
  50         struct dentry *dir;
  51         char buf[10];
  52         int i;
  53
  54         dir = oprofilefs_mkdir(sb, root, "stats");
  55         if (!dir)
  56                 return;
  57
  58         for_each_possible_cpu(i) {
  59                 cpu_buf = &per_cpu(cpu_buffer, i);
  60                 snprintf(buf, 10, "cpu%d", i);
  61                 cpudir = oprofilefs_mkdir(sb, dir, buf);
  62
  63                 /* Strictly speaking access to these ulongs is racy,
  64                  * but we can't simply lock them, and they are
  65                  * informational only.
  66                  */
  67                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
  68                         &cpu_buf->sample_received);
  69                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
  70                         &cpu_buf->sample_lost_overflow);
  71                 oprofilefs_create_ro_ulong(sb, cpudir, "backtrace_aborted",
  72                         &cpu_buf->backtrace_aborted);
  73                 oprofilefs_create_ro_ulong(sb, cpudir, "sample_invalid_eip",
  74                         &cpu_buf->sample_invalid_eip);
  75         }
  76
  77         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
  78                 &oprofile_stats.sample_lost_no_mm);
  79         oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
  80                 &oprofile_stats.sample_lost_no_mapping);
  81         oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
  82                 &oprofile_stats.event_lost_overflow);
  83         oprofilefs_create_ro_atomic(sb, dir, "bt_lost_no_mapping",
  84                 &oprofile_stats.bt_lost_no_mapping);
  85 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
  86         oprofilefs_create_ro_atomic(sb, dir, "multiplex_counter",
  87                 &multiplex_counter);
  88 #endif
  89 }