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/*
* Copyright (C) 2013-2021 Canonical, Ltd.
* Copyright (C) 2022-2025 Colin Ian King.
*
* 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 "stress-ng.h"
#include "core-io-priority.h"
/*
* stress_get_opt_ionice_class()
* string io scheduler to IOPRIO_CLASS
*/
int32_t stress_get_opt_ionice_class(const char *const str)
{
#if defined(IOPRIO_CLASS_IDLE)
if (!strcmp("idle", str))
return IOPRIO_CLASS_IDLE;
#endif
#if defined(IOPRIO_CLASS_BE)
if (!strcmp("besteffort", str) ||
!strcmp("be", str))
return IOPRIO_CLASS_BE;
#endif
#if defined(IOPRIO_CLASS_RT)
if (!strcmp("realtime", str) ||
!strcmp("rt", str))
return IOPRIO_CLASS_RT;
#endif
if (strcmp("which", str))
(void)fprintf(stderr, "Invalid ionice-class option: %s\n", str);
(void)fprintf(stderr, "Available options are:");
#if defined(IOPRIO_CLASS_IDLE)
(void)fprintf(stderr, " idle");
#endif
#if defined(IOPRIO_CLASS_BE)
(void)fprintf(stderr, " besteffort be");
#endif
#if defined(IOPRIO_CLASS_RT)
(void)fprintf(stderr, " realtime rt");
#endif
(void)fprintf(stderr, "\n");
_exit(EXIT_FAILURE);
return 0;
}
#if defined(__NR_ioprio_set)
/*
* stress_set_iopriority()
* check ioprio settings and set
*/
void stress_set_iopriority(const int32_t class, const int32_t level)
{
int data = level, rc;
switch (class) {
case UNDEFINED: /* No preference, don't set */
return;
case IOPRIO_CLASS_RT:
case IOPRIO_CLASS_BE:
if ((level < 0) || (level > 7)) {
(void)fprintf(stderr, "Priority levels range from 0 "
"(max) to 7 (min)\n");
_exit(EXIT_FAILURE);
}
break;
case IOPRIO_CLASS_IDLE:
if ((level != UNDEFINED) &&
(level != 0))
(void)fprintf(stderr, "Cannot set priority level "
"with idle, defaulting to 0\n");
data = 0;
break;
default:
(void)fprintf(stderr, "Unknown priority class: %d\n", class);
_exit(EXIT_FAILURE);
}
rc = shim_ioprio_set(IOPRIO_WHO_PROCESS, 0,
IOPRIO_PRIO_VALUE(class, data));
if ((rc < 0) && (errno != ENOSYS)) {
(void)fprintf(stderr, "Cannot set I/O priority, errno=%d (%s)\n",
errno, strerror(errno));
_exit(EXIT_FAILURE);
}
}
#else
void stress_set_iopriority(const int32_t class, const int32_t level)
{
(void)class;
(void)level;
}
#endif
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