static int
dasd_statistics_read(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
unsigned long len;
#ifdef CONFIG_DASD_PROFILE
struct dasd_profile_info_t *prof;
char *str;
int shift;
/* check for active profiling */
if (dasd_profile_level == DASD_PROFILE_OFF) {
len = sprintf(page, "Statistics are off - they might be "
"switched on using 'echo set on > "
"/proc/dasd/statistics'\n");
return dasd_calc_metrics(page, start, off, count, eof, len);
}
prof = &dasd_global_profile;
/* prevent couter 'overflow' on output */
for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
str = page;
str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
str += sprintf(str, "with %d sectors(512B each)\n",
prof->dasd_io_sects);
str += sprintf(str,
" __<4 ___8 __16 __32 __64 _128 "
" _256 _512 __1k __2k __4k __8k "
" _16k _32k _64k 128k\n");
str += sprintf(str,
" _256 _512 __1M __2M __4M __8M "
" _16M _32M _64M 128M 256M 512M "
" __1G __2G __4G " " _>4G\n");
str += sprintf(str, "Histogram of sizes (512B secs)\n");
str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
str += sprintf(str, "Histogram of I/O times (microseconds)\n");
str = dasd_statistics_array(str, prof->dasd_io_times, shift);
str += sprintf(str, "Histogram of I/O times per sector\n");
str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
str += sprintf(str, "Histogram of I/O time till ssch\n");
str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
str += sprintf(str, "Histogram of I/O time between ssch "
"and irq per sector\n");
str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
str += sprintf(str, "Histogram of I/O time between irq and end\n");
str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
len = str - page;
#else
len = sprintf(page, "Statistics are not activated in this kernel\n");
#endif
return dasd_calc_metrics(page, start, off, count, eof, len);
}
static int dasd_stats_proc_show(struct seq_file *m, void *v)
{
#ifdef CONFIG_DASD_PROFILE
struct dasd_profile_info *prof;
int factor;
spin_lock_bh(&dasd_global_profile.lock);
prof = dasd_global_profile.data;
if (!prof) {
spin_unlock_bh(&dasd_global_profile.lock);
seq_printf(m, "Statistics are off - they might be "
"switched on using 'echo set on > "
"/proc/dasd/statistics'\n");
return 0;
}
/* prevent counter 'overflow' on output */
for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
factor *= 10);
seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
seq_printf(m, "with %u sectors(512B each)\n",
prof->dasd_io_sects);
seq_printf(m, "Scale Factor is %d\n", factor);
seq_printf(m,
" __<4 ___8 __16 __32 __64 _128 "
" _256 _512 __1k __2k __4k __8k "
" _16k _32k _64k 128k\n");
seq_printf(m,
" _256 _512 __1M __2M __4M __8M "
" _16M _32M _64M 128M 256M 512M "
" __1G __2G __4G " " _>4G\n");
seq_printf(m, "Histogram of sizes (512B secs)\n");
dasd_statistics_array(m, prof->dasd_io_secs, factor);
seq_printf(m, "Histogram of I/O times (microseconds)\n");
dasd_statistics_array(m, prof->dasd_io_times, factor);
seq_printf(m, "Histogram of I/O times per sector\n");
dasd_statistics_array(m, prof->dasd_io_timps, factor);
seq_printf(m, "Histogram of I/O time till ssch\n");
dasd_statistics_array(m, prof->dasd_io_time1, factor);
seq_printf(m, "Histogram of I/O time between ssch and irq\n");
dasd_statistics_array(m, prof->dasd_io_time2, factor);
seq_printf(m, "Histogram of I/O time between ssch "
"and irq per sector\n");
dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
seq_printf(m, "Histogram of I/O time between irq and end\n");
dasd_statistics_array(m, prof->dasd_io_time3, factor);
seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
spin_unlock_bh(&dasd_global_profile.lock);
#else
seq_printf(m, "Statistics are not activated in this kernel\n");
#endif
return 0;
}
