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/*
* Copyright (C) 2013-2017 Canonical, Ltd.
*
* 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.
*
* This code is a complete clean re-write of the stress tool by
* Colin Ian King <colin.king@canonical.com> and attempts to be
* backwardly compatible with the stress tool by Amos Waterland
* <apw@rossby.metr.ou.edu> but has more stress tests and more
* functionality.
*
*/
#include "stress-ng.h"
#if (defined(_POSIX_PRIORITY_SCHEDULING) || defined(__linux__)) && \
!defined(__OpenBSD__) && !defined(__minix__)
/*
* get_sched_name()
* convert sched class to human readable string
*/
const char *get_sched_name(const int sched)
{
switch (sched) {
#if defined(SCHED_IDLE)
case SCHED_IDLE:
return "idle";
#endif
#if defined(SCHED_FIFO)
case SCHED_FIFO:
return "fifo";
#endif
#if defined(SCHED_RR)
case SCHED_RR:
return "rr";
#endif
#if defined(SCHED_OTHER)
case SCHED_OTHER:
return "other";
#endif
#if defined(SCHED_BATCH)
case SCHED_BATCH:
return "batch";
#endif
#if defined(SCHED_DEADLINE)
case SCHED_DEADLINE:
return "deadline";
#endif
default:
return "unknown";
}
}
#endif
#if (defined(_POSIX_PRIORITY_SCHEDULING) || defined(__linux__)) && \
!defined(__OpenBSD__) && !defined(__minix__)
/*
* set_sched()
* are sched settings valid, if so, set them
*/
void set_sched(const int sched, const int32_t sched_priority)
{
#if defined(SCHED_FIFO) || defined(SCHED_RR)
int min, max;
#endif
int rc;
struct sched_param param;
const char *name = get_sched_name(sched);
memset(¶m, 0, sizeof(param));
switch (sched) {
case UNDEFINED: /* No preference, don't set */
return;
#if defined(SCHED_FIFO) || defined(SCHED_RR)
#if defined(SCHED_FIFO)
case SCHED_FIFO:
#endif
#if defined(SCHED_RR)
case SCHED_RR:
#endif
min = sched_get_priority_min(sched);
max = sched_get_priority_max(sched);
param.sched_priority = sched_priority;
if (param.sched_priority == UNDEFINED) {
if (opt_flags & OPT_FLAGS_AGGRESSIVE)
param.sched_priority = max;
else
param.sched_priority = (max - min) / 2;
pr_inf(stdout, "priority not given, defaulting to %d\n",
param.sched_priority);
}
if ((param.sched_priority < min) ||
(param.sched_priority > max)) {
fprintf(stderr, "Scheduler priority level must be "
"set between %d and %d\n",
min, max);
exit(EXIT_FAILURE);
}
pr_dbg(stderr, "setting scheduler class '%s', priority %d\n",
name, param.sched_priority);
break;
#endif
default:
param.sched_priority = 0;
if (sched_priority != UNDEFINED)
pr_inf(stdout, "ignoring priority level for "
"scheduler class '%s'\n", name);
pr_dbg(stderr, "setting scheduler class '%s'\n", name);
break;
}
rc = sched_setscheduler(getpid(), sched, ¶m);
if (rc < 0) {
fprintf(stderr, "Cannot set scheduler: errno=%d (%s)\n",
errno, strerror(errno));
exit(EXIT_FAILURE);
}
}
#else
void set_sched(const int32_t sched, const int32_t sched_priority)
{
(void)sched;
(void)sched_priority;
}
#endif
/*
* get_opt_sched()
* get scheduler policy
*/
int32_t get_opt_sched(const char *const str)
{
#if defined(SCHED_OTHER)
if (!strcmp("other", str))
return SCHED_OTHER;
#endif
#if defined(SCHED_BATCH)
if (!strcmp("batch", str))
return SCHED_BATCH;
#endif
#if defined(SCHED_IDLE)
if (!strcmp("idle", str))
return SCHED_IDLE;
#endif
#if defined(SCHED_FIFO)
if (!strcmp("fifo", str))
return SCHED_FIFO;
#endif
#if defined(SCHED_RR)
if (!strcmp("rr", str))
return SCHED_RR;
#endif
#if defined(SCHED_DEADLINE)
if (!strcmp("deadline", str))
return SCHED_DEADLINE;
#endif
if (strcmp("which", str))
fprintf(stderr, "Invalid sched option: %s\n", str);
fprintf(stderr, "Available scheduler options are:"
#if defined(SCHED_OTHER)
" other"
#endif
#if defined(SCHED_BATCH)
" batch"
#endif
#if defined(SCHED_DEADLINE)
" deadline"
#endif
#if defined(SCHED_IDLE)
" idle"
#endif
#if defined(SCHED_FIFO)
" fifo"
#endif
#if defined(SCHED_FIFO)
" rr"
#endif
"\n");
exit(EXIT_FAILURE);
}
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