Re: [RFC 2/6] Provide cgroup interface for manual jitter classification

[Dietmar Eggemann <dietmar.eggemann@arm.com>]

On 3/22/19 7:06 AM, Parth Shah wrote:
> Signed-off-by: Parth Shah <parth015@linux.vnet.ibm.com>
> ---
>   include/linux/sched.h |  8 ++++++++
>   kernel/sched/core.c   | 46 +++++++++++++++++++++++++++++++++++++++++++
>   kernel/sched/fair.c   | 15 +++++++++-----
>   kernel/sched/sched.h  |  2 ++
>   4 files changed, 66 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 903ef29b62c3..be8e8617e0cb 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -604,6 +604,14 @@ struct task_struct {
>   	unsigned int			flags;
>   	unsigned int			ptrace;
>   
> +	/*
> +	 * task_characteristics:
> +	 * 0 = unknown. Follows regular CFS policy for task placement.
> +	 * 1 = Throughput intensive high utilization task
> +	 * 2 = Jitter tasks. Should be packed to reduce active core count.

This is very similar to the ideas in [PATCH v8 00/16] Add utilization 
clamping support 
https://lore.kernel.org/lkml/20190402104153.25404-1-patrick.bellasi@arm.com 
. Task classification from userspace ...

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