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util-linux/schedutils/sched_attr.h

127 lines
3.6 KiB

/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation
*
* 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.
*
* Copyright (C) 2004 Robert Love
* Copyright (C) 2020-2021 Qais Yousef
* Copyright (C) 2020-2021 Arm Ltd
*/
#ifndef UTIL_LINUX_SCHED_ATTR_H
#define UTIL_LINUX_SCHED_ATTR_H
/* the SCHED_BATCH is supported since Linux 2.6.16
* -- temporary workaround for people with old glibc headers
*/
#if defined (__linux__) && !defined(SCHED_BATCH)
# define SCHED_BATCH 3
#endif
/* the SCHED_IDLE is supported since Linux 2.6.23
* commit id 0e6aca43e08a62a48d6770e9a159dbec167bf4c6
* -- temporary workaround for people with old glibc headers
*/
#if defined (__linux__) && !defined(SCHED_IDLE)
# define SCHED_IDLE 5
#endif
/* flag by sched_getscheduler() */
#if defined(__linux__) && !defined(SCHED_RESET_ON_FORK)
# define SCHED_RESET_ON_FORK 0x40000000
#endif
/* flag by sched_getattr() */
#if defined(__linux__) && !defined(SCHED_FLAG_RESET_ON_FORK)
# define SCHED_FLAG_RESET_ON_FORK 0x01
#endif
#if defined(__linux__) && !defined(SCHED_FLAG_RECLAIM)
# define SCHED_FLAG_RECLAIM 0x02
#endif
#if defined(__linux__) && !defined(SCHED_FLAG_DL_OVERRUN)
# define SCHED_FLAG_DL_OVERRUN 0x04
#endif
#if defined(__linux__) && !defined(SCHED_FLAG_KEEP_POLICY)
# define SCHED_FLAG_KEEP_POLICY 0x08
#endif
#if defined(__linux__) && !defined(SCHED_FLAG_KEEP_PARAMS)
# define SCHED_FLAG_KEEP_PARAMS 0x10
#endif
#if defined(__linux__) && !defined(SCHED_FLAG_UTIL_CLAMP_MIN)
# define SCHED_FLAG_UTIL_CLAMP_MIN 0x20
#endif
#if defined(__linux__) && !defined(SCHED_FLAG_UTIL_CLAMP_MAX)
# define SCHED_FLAG_UTIL_CLAMP_MAX 0x40
#endif
#ifdef HAVE_SYS_SYSCALL_H
# include <sys/syscall.h>
#endif
/* usable kernel-headers, but old glibc-headers */
#if defined (__linux__) && !defined(SYS_sched_setattr) && defined(__NR_sched_setattr)
# define SYS_sched_setattr __NR_sched_setattr
#endif
#if defined (__linux__) && !defined(SYS_sched_getattr) && defined(__NR_sched_getattr)
# define SYS_sched_getattr __NR_sched_getattr
#endif
#if defined (__linux__) && !defined(HAVE_SCHED_SETATTR) && defined(SYS_sched_setattr)
# define HAVE_SCHED_SETATTR
struct sched_attr {
uint32_t size;
uint32_t sched_policy;
uint64_t sched_flags;
/* SCHED_NORMAL, SCHED_BATCH */
int32_t sched_nice;
/* SCHED_FIFO, SCHED_RR */
uint32_t sched_priority;
/* SCHED_DEADLINE (nsec) */
uint64_t sched_runtime;
uint64_t sched_deadline;
uint64_t sched_period;
/* UTILIZATION CLAMPING */
uint32_t sched_util_min;
uint32_t sched_util_max;
};
static int sched_setattr(pid_t pid, const struct sched_attr *attr, unsigned int flags)
{
return syscall(SYS_sched_setattr, pid, attr, flags);
}
static int sched_getattr(pid_t pid, struct sched_attr *attr, unsigned int size, unsigned int flags)
{
return syscall(SYS_sched_getattr, pid, attr, size, flags);
}
#endif
/* the SCHED_DEADLINE is supported since Linux 3.14
* commit id aab03e05e8f7e26f51dee792beddcb5cca9215a5
* -- sched_setattr() is required for this policy!
*/
#if defined (__linux__) && !defined(SCHED_DEADLINE) && defined(HAVE_SCHED_SETATTR)
# define SCHED_DEADLINE 6
#endif
#endif /* UTIL_LINUX_SCHED_ATTR_H */