6f52b16c5b
Many user space API headers are missing licensing information, which makes it hard for compliance tools to determine the correct license. By default are files without license information under the default license of the kernel, which is GPLV2. Marking them GPLV2 would exclude them from being included in non GPLV2 code, which is obviously not intended. The user space API headers fall under the syscall exception which is in the kernels COPYING file: NOTE! This copyright does *not* cover user programs that use kernel services by normal system calls - this is merely considered normal use of the kernel, and does *not* fall under the heading of "derived work". otherwise syscall usage would not be possible. Update the files which contain no license information with an SPDX license identifier. The chosen identifier is 'GPL-2.0 WITH Linux-syscall-note' which is the officially assigned identifier for the Linux syscall exception. SPDX license identifiers are a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. See the previous patch in this series for the methodology of how this patch was researched. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_SCHED_TYPES_H
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#define _UAPI_LINUX_SCHED_TYPES_H
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#include <linux/types.h>
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struct sched_param {
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int sched_priority;
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};
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#define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */
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/*
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* Extended scheduling parameters data structure.
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*
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* This is needed because the original struct sched_param can not be
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* altered without introducing ABI issues with legacy applications
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* (e.g., in sched_getparam()).
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*
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* However, the possibility of specifying more than just a priority for
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* the tasks may be useful for a wide variety of application fields, e.g.,
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* multimedia, streaming, automation and control, and many others.
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*
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* This variant (sched_attr) is meant at describing a so-called
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* sporadic time-constrained task. In such model a task is specified by:
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* - the activation period or minimum instance inter-arrival time;
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* - the maximum (or average, depending on the actual scheduling
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* discipline) computation time of all instances, a.k.a. runtime;
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* - the deadline (relative to the actual activation time) of each
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* instance.
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* Very briefly, a periodic (sporadic) task asks for the execution of
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* some specific computation --which is typically called an instance--
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* (at most) every period. Moreover, each instance typically lasts no more
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* than the runtime and must be completed by time instant t equal to
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* the instance activation time + the deadline.
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*
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* This is reflected by the actual fields of the sched_attr structure:
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*
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* @size size of the structure, for fwd/bwd compat.
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*
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* @sched_policy task's scheduling policy
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* @sched_flags for customizing the scheduler behaviour
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* @sched_nice task's nice value (SCHED_NORMAL/BATCH)
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* @sched_priority task's static priority (SCHED_FIFO/RR)
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* @sched_deadline representative of the task's deadline
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* @sched_runtime representative of the task's runtime
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* @sched_period representative of the task's period
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*
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* Given this task model, there are a multiplicity of scheduling algorithms
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* and policies, that can be used to ensure all the tasks will make their
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* timing constraints.
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*
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* As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the
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* only user of this new interface. More information about the algorithm
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* available in the scheduling class file or in Documentation/.
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*/
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struct sched_attr {
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__u32 size;
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__u32 sched_policy;
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__u64 sched_flags;
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/* SCHED_NORMAL, SCHED_BATCH */
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__s32 sched_nice;
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/* SCHED_FIFO, SCHED_RR */
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__u32 sched_priority;
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/* SCHED_DEADLINE */
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__u64 sched_runtime;
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__u64 sched_deadline;
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__u64 sched_period;
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};
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#endif /* _UAPI_LINUX_SCHED_TYPES_H */
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