[PATCH 08/53] sched/headers: Move various ABI definitions to

Ingo Molnar
2017-02-08T18:56:18Z

Move scheduler ABI types (struct sched_attr, struct sched_param, etc.) into
the new UAPI header.

This further reduces the size and complexity of <linux/sched.h>.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
include/linux/sched.h | 70 ++----------------------------------------------------------
include/uapi/linux/sched/types.h | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+), 68 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 15e339af7dec..9c907c5a3f82 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -5,11 +5,6 @@

#include <linux/sched/prio.h>

-
-struct sched_param {
- int sched_priority;
-};
-
#include <asm/param.h> /* for HZ */

#include <linux/capability.h>
@@ -64,69 +59,8 @@ struct sched_param {

#include <asm/processor.h>

-#define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */
-
-/*
- * Extended scheduling parameters data structure.
- *
- * This is needed because the original struct sched_param can not be
- * altered without introducing ABI issues with legacy applications
- * (e.g., in sched_getparam()).
- *
- * However, the possibility of specifying more than just a priority for
- * the tasks may be useful for a wide variety of application fields, e.g.,
- * multimedia, streaming, automation and control, and many others.
- *
- * This variant (sched_attr) is meant at describing a so-called
- * sporadic time-constrained task. In such model a task is specified by:
- * - the activation period or minimum instance inter-arrival time;
- * - the maximum (or average, depending on the actual scheduling
- * discipline) computation time of all instances, a.k.a. runtime;
- * - the deadline (relative to the actual activation time) of each
- * instance.
- * Very briefly, a periodic (sporadic) task asks for the execution of
- * some specific computation --which is typically called an instance--
- * (at most) every period. Moreover, each instance typically lasts no more
- * than the runtime and must be completed by time instant t equal to
- * the instance activation time + the deadline.
- *
- * This is reflected by the actual fields of the sched_attr structure:
- *
- * @size size of the structure, for fwd/bwd compat.
- *
- * @sched_policy task's scheduling policy
- * @sched_flags for customizing the scheduler behaviour
- * @sched_nice task's nice value (SCHED_NORMAL/BATCH)
- * @sched_priority task's static priority (SCHED_FIFO/RR)
- * @sched_deadline representative of the task's deadline
- * @sched_runtime representative of the task's runtime
- * @sched_period representative of the task's period
- *
- * Given this task model, there are a multiplicity of scheduling algorithms
- * and policies, that can be used to ensure all the tasks will make their
- * timing constraints.
- *
- * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the
- * only user of this new interface. More information about the algorithm
- * available in the scheduling class file or in Documentation/.
- */
-struct sched_attr {
- u32 size;
-
- u32 sched_policy;
- u64 sched_flags;
-
- /* SCHED_NORMAL, SCHED_BATCH */
- s32 sched_nice;
-
- /* SCHED_FIFO, SCHED_RR */
- u32 sched_priority;
-
- /* SCHED_DEADLINE */
- u64 sched_runtime;
- u64 sched_deadline;
- u64 sched_period;
-};
+struct sched_attr;
+struct sched_param;

struct futex_pi_state;
struct robust_list_head;
diff --git a/include/uapi/linux/sched/types.h b/include/uapi/linux/sched/types.h
index d162d315f4b5..307acbc82d80 100644
--- a/include/uapi/linux/sched/types.h
+++ b/include/uapi/linux/sched/types.h
@@ -3,4 +3,72 @@

#include <linux/types.h>

+struct sched_param {
+ int sched_priority;
+};
+
+#define SCHED_ATTR_SIZE_VER0 48 /* sizeof first published struct */
+
+/*
+ * Extended scheduling parameters data structure.
+ *
+ * This is needed because the original struct sched_param can not be
+ * altered without introducing ABI issues with legacy applications
+ * (e.g., in sched_getparam()).
+ *
+ * However, the possibility of specifying more than just a priority for
+ * the tasks may be useful for a wide variety of application fields, e.g.,
+ * multimedia, streaming, automation and control, and many others.
+ *
+ * This variant (sched_attr) is meant at describing a so-called
+ * sporadic time-constrained task. In such model a task is specified by:
+ * - the activation period or minimum instance inter-arrival time;
+ * - the maximum (or average, depending on the actual scheduling
+ * discipline) computation time of all instances, a.k.a. runtime;
+ * - the deadline (relative to the actual activation time) of each
+ * instance.
+ * Very briefly, a periodic (sporadic) task asks for the execution of
+ * some specific computation --which is typically called an instance--
+ * (at most) every period. Moreover, each instance typically lasts no more
+ * than the runtime and must be completed by time instant t equal to
+ * the instance activation time + the deadline.
+ *
+ * This is reflected by the actual fields of the sched_attr structure:
+ *
+ * @size size of the structure, for fwd/bwd compat.
+ *
+ * @sched_policy task's scheduling policy
+ * @sched_flags for customizing the scheduler behaviour
+ * @sched_nice task's nice value (SCHED_NORMAL/BATCH)
+ * @sched_priority task's static priority (SCHED_FIFO/RR)
+ * @sched_deadline representative of the task's deadline
+ * @sched_runtime representative of the task's runtime
+ * @sched_period representative of the task's period
+ *
+ * Given this task model, there are a multiplicity of scheduling algorithms
+ * and policies, that can be used to ensure all the tasks will make their
+ * timing constraints.
+ *
+ * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the
+ * only user of this new interface. More information about the algorithm
+ * available in the scheduling class file or in Documentation/.
+ */
+struct sched_attr {
+ u32 size;
+
+ u32 sched_policy;
+ u64 sched_flags;
+
+ /* SCHED_NORMAL, SCHED_BATCH */
+ s32 sched_nice;
+
+ /* SCHED_FIFO, SCHED_RR */
+ u32 sched_priority;
+
+ /* SCHED_DEADLINE */
+ u64 sched_runtime;
+ u64 sched_deadline;
+ u64 sched_period;
+};
+
#endif /* _UAPI_LINUX_SCHED_TYPES_H */
--
2.7.4