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/* Copyright (c) 2003-2004 Roger Seguin <roger_seguin@msn.com>
*
* 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 Library 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _devperf_h
#define _devperf_h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <unistd.h>
#include <inttypes.h>
enum {
NO_ERROR,
NO_EXTENDED_STATS
};
typedef struct devperf_t {
uint64_t timestamp_ns;
uint64_t rbytes; /* Number of bytes read from the device */
uint64_t wbytes; /* Number of bytes written to the device */
uint64_t rbusy_ns; /* Device read busy time */
uint64_t wbusy_ns; /* Device write busy time */
int32_t qlen; /* Current queue length */
} devperf_t;
#ifdef __cplusplus
extern "C" {
#endif
int DevPerfInit ();
/* Make required initialisations */
/* Return 0 on success */
int DevCheckStatAvailability (char const **StatisticsFile);
/* Check the availability of required kernel statistics */
/* Get the statistics file name */
/* Return 0 on success */
int DevGetPerfData (const void *devid,
struct devperf_t *perf);
/* Get disk performance data stored by the kernel */
/* Return 0 on success, -1 otherwise */
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* _devperf_h */
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