text: /**
   * @file oprofile_stats.c
   *
   * @remark Copyright 2002 OProfile authors
   * @remark Read the file COPYING
   *
   * @author John Levon
   */
  
  #include <linux/oprofile.h>
  #include <linux/smp.h>
  #include <linux/cpumask.h>
  #include <linux/threads.h>
   
  #include "oprofile_stats.h"
  #include "cpu_buffer.h"
   
  struct oprofile_stat_struct oprofile_stats;
   
  void oprofile_reset_stats(void)
  {
  	struct oprofile_cpu_buffer * cpu_buf; 
  	int i;
   
  	for_each_possible_cpu(i) {
  		cpu_buf = &cpu_buffer[i]; 
  		cpu_buf->sample_received = 0;
  		cpu_buf->sample_lost_overflow = 0;
  		cpu_buf->backtrace_aborted = 0;
  		cpu_buf->sample_invalid_eip = 0;
  	}
   
  	atomic_set(&oprofile_stats.sample_lost_no_mm, 0);
  	atomic_set(&oprofile_stats.sample_lost_no_mapping, 0);
  	atomic_set(&oprofile_stats.event_lost_overflow, 0);
  }
  
  
  void oprofile_create_stats_files(struct super_block * sb, struct dentry * root)
  {
  	struct oprofile_cpu_buffer * cpu_buf;
  	struct dentry * cpudir;
  	struct dentry * dir;
  	char buf[10];
  	int i;
  
  	dir = oprofilefs_mkdir(sb, root, "stats");
  	if (!dir)
  		return;
  
  	for_each_possible_cpu(i) {
  		cpu_buf = &cpu_buffer[i]; 
  		snprintf(buf, 10, "cpu%d", i);
  		cpudir = oprofilefs_mkdir(sb, dir, buf);
   
  		/* Strictly speaking access to these ulongs is racy,
  		 * but we can't simply lock them, and they are
  		 * informational only.
  		 */
  		oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
  			&cpu_buf->sample_received);
  		oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
  			&cpu_buf->sample_lost_overflow);
  		oprofilefs_create_ro_ulong(sb, cpudir, "backtrace_aborted",
  			&cpu_buf->backtrace_aborted);
  		oprofilefs_create_ro_ulong(sb, cpudir, "sample_invalid_eip",
  			&cpu_buf->sample_invalid_eip);
  	}
   
  	oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
  		&oprofile_stats.sample_lost_no_mm);
  	oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
  		&oprofile_stats.sample_lost_no_mapping);
  	oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
  		&oprofile_stats.event_lost_overflow);
  	oprofilefs_create_ro_atomic(sb, dir, "bt_lost_no_mapping",
  		&oprofile_stats.bt_lost_no_mapping);
  }
  