/**
   * @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 = &per_cpu(op_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);

  	atomic_set(&oprofile_stats.bt_lost_no_mapping, 0);

  	atomic_set(&oprofile_stats.multiplex_counter, 0);

  }

  void oprofile_create_stats_files(struct dentry *root)

  {

  	struct oprofile_cpu_buffer *cpu_buf;
  	struct dentry *cpudir;
  	struct dentry *dir;

  	char buf[10];
  	int i;

  	dir = oprofilefs_mkdir(root, "stats");

  	if (!dir)
  		return;

  	for_each_possible_cpu(i) {

  		cpu_buf = &per_cpu(op_cpu_buffer, i);

  		snprintf(buf, 10, "cpu%d", i);

  		cpudir = oprofilefs_mkdir(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(cpudir, "sample_received",

  			&cpu_buf->sample_received);

  		oprofilefs_create_ro_ulong(cpudir, "sample_lost_overflow",

  			&cpu_buf->sample_lost_overflow);

  		oprofilefs_create_ro_ulong(cpudir, "backtrace_aborted",

  			&cpu_buf->backtrace_aborted);

  		oprofilefs_create_ro_ulong(cpudir, "sample_invalid_eip",

  			&cpu_buf->sample_invalid_eip);

  	}

  	oprofilefs_create_ro_atomic(dir, "sample_lost_no_mm",

  		&oprofile_stats.sample_lost_no_mm);

  	oprofilefs_create_ro_atomic(dir, "sample_lost_no_mapping",

  		&oprofile_stats.sample_lost_no_mapping);

  	oprofilefs_create_ro_atomic(dir, "event_lost_overflow",

  		&oprofile_stats.event_lost_overflow);

  	oprofilefs_create_ro_atomic(dir, "bt_lost_no_mapping",

  		&oprofile_stats.bt_lost_no_mapping);

  #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX

  	oprofilefs_create_ro_atomic(dir, "multiplex_counter",

  		&oprofile_stats.multiplex_counter);

  #endif

  }