Messages in this thread Patch in this message | | | From | Parth Shah <> | Subject | [RFC 1/3] Introduce latency-tolerance as an per-task attribute | Date | Mon, 25 Nov 2019 15:16:16 +0530 |
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Latency-tolerance indicates the latency requirements of a task with respect to the other tasks in the system. The value of the attribute can be within the range of [-20, 19] both inclusive to be in-line with the values just like task nice values.
latency_tolerance = -20 indicates the task to have the least latency as compared to the tasks having latency_tolerance = +19.
The latency_tolerance may affect only the CFS SCHED_CLASS by getting latency requirements from the userspace.
Signed-off-by: Parth Shah <parth@linux.ibm.com> --- include/linux/sched.h | 3 +++ include/linux/sched/latency_tolerance.h | 13 +++++++++++++ 2 files changed, 16 insertions(+) create mode 100644 include/linux/sched/latency_tolerance.h
diff --git a/include/linux/sched.h b/include/linux/sched.h index 2c2e56bd8913..bcc1c1d0856d 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -25,6 +25,7 @@ #include <linux/resource.h> #include <linux/latencytop.h> #include <linux/sched/prio.h> +#include <linux/sched/latency_tolerance.h> #include <linux/sched/types.h> #include <linux/signal_types.h> #include <linux/mm_types_task.h> @@ -666,6 +667,8 @@ struct task_struct { #endif int on_rq; + int latency_tolerance; + int prio; int static_prio; int normal_prio; diff --git a/include/linux/sched/latency_tolerance.h b/include/linux/sched/latency_tolerance.h new file mode 100644 index 000000000000..7a00abe05bc4 --- /dev/null +++ b/include/linux/sched/latency_tolerance.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_SCHED_LATENCY_TOLERANCE_H +#define _LINUX_SCHED_LATENCY_TOLERANCE_H + +#define MAX_LATENCY_TOLERANCE 19 +#define MIN_LATENCY_TOLERANCE -20 + +#define LATENCY_TOLERANCE_WIDTH \ + (MAX_LATENCY_TOLERANCE - MIN_LATENCY_TOLERANCE + 1) + +#define DEFAULT_LATENCY_TOLERANCE 0 + +#endif /* _LINUX_SCHED_LATENCY_TOLERANCE_H */ -- 2.17.2
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