oprofile_stats.c

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#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 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 = &per_cpu(op_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);
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
    oprofilefs_create_ro_atomic(sb, dir, "multiplex_counter",
        &oprofile_stats.multiplex_counter);
#endif
}