[Devel] [PATCH RHEL COMMIT] sched: Account task_group::start_time

[Konstantin Khorenko]

reverted

https://jira.sw.ru/browse/PSBM-134393

--
Best regards,

Konstantin Khorenko,
Virtuozzo Linux Kernel Team

On 01.10.2021 19:38, Konstantin Khorenko wrote:
> The commit is pushed to "branch-rh9-5.14.vz9.1.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
> after ark-5.14
> ------>
> commit ccf05b7b60625d7da33245107480e1105cfbaf5f
> Author: Kirill Tkhai <ktkhai at virtuozzo.com>
> Date:   Fri Oct 1 19:38:38 2021 +0300
> 
>      sched: Account task_group::start_time
>      
>      Extracted from "Initial patch".
>      
>      Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
>      
>      (cherry picked from vz7 commit bad04073f185d257f6a3290523ca02c095837e8b)
>      Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
>      
>      Rebase to vz8 notes:
>      * moved from struct timespec to u64 (nsec)
>      
>      Cherry-picked from vz8 commit e4826d8be177 ("sched: Account
>      task_group::start_time"))
>      
>      Followed ktime_get_boot_ns() -> ktime_get_boottime_ns() rename.
>      
>      Signed-off-by: Nikita Yushchenko <nikita.yushchenko at virtuozzo.com>
> ---
>   kernel/sched/core.c  | 4 ++++
>   kernel/sched/sched.h | 3 +++
>   2 files changed, 7 insertions(+)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index a530d3cba26d..b164cd9de057 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -9178,6 +9178,7 @@ void __init sched_init(void)
>   #ifdef CONFIG_CFS_CPULIMIT
>   	root_task_group.topmost_limited_ancestor = &root_task_group;
>   #endif
> +	root_task_group.start_time = 0;
>   #endif /* CONFIG_CGROUP_SCHED */
>   
>   	for_each_possible_cpu(i) {
> @@ -9559,6 +9560,9 @@ struct task_group *sched_create_group(struct task_group *parent)
>   
>   	alloc_uclamp_sched_group(tg, parent);
>   
> +	/* start_time is saved CT0 uptime */
> +	tg->start_time = ktime_get_boottime_ns();
> +
>   	return tg;
>   
>   err:
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index 45b2cb7203ea..0a0ef82744bf 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -430,6 +430,9 @@ struct task_group {
>   	struct autogroup	*autogroup;
>   #endif
>   
> +	/* Monotonic time in nsecs: */
> +	u64			start_time;
> +
>   	struct cfs_bandwidth	cfs_bandwidth;
>   
>   #ifdef CONFIG_UCLAMP_TASK_GROUP
> .
>