mars/kernel/lib_timing.c
2015-02-27 11:32:57 +01:00

74 lines
1.8 KiB
C

/*
* MARS Long Distance Replication Software
*
* This file is part of MARS project: http://schoebel.github.io/mars/
*
* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
* Copyright (C) 2011-2014 1&1 Internet AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "lib_timing.h"
#include <linux/kernel.h>
#include <linux/module.h>
#ifdef CONFIG_MARS_DEBUG
int report_timing(struct timing_stats *tim, char *str, int maxlen)
{
int len = 0;
int time = 1;
int resol = 1;
static const char *units[] = {
"us",
"ms",
"s",
"ERROR"
};
const char *unit = units[0];
int unit_index = 0;
int i;
for (i = 0; i < TIMING_MAX; i++) {
int this_len = scnprintf(str, maxlen, "<%d%s = %d (%lld) ", resol, unit, tim->tim_count[i], (long long)tim->tim_count[i] * time);
str += this_len;
len += this_len;
maxlen -= this_len;
if (maxlen <= 1)
break;
resol <<= 1;
time <<= 1;
if (resol >= 1000) {
resol = 1;
unit = units[++unit_index];
}
}
return len;
}
EXPORT_SYMBOL_GPL(report_timing);
#endif
struct threshold global_io_threshold = {
.thr_limit = 30 * 1000000, // 30 seconds
.thr_factor = 100,
.thr_plus = 0,
};
EXPORT_SYMBOL_GPL(global_io_threshold);