On Thu, Feb 10, 2022 at 01:40:28PM +0800, Zhen Ni wrote:
> move cfs_bandwidth_slice sysctls to fair.c and use the
> new register_sysctl_init() to register the sysctl interface.
>
> Signed-off-by: Zhen Ni <nizhen@xxxxxxxxxxxxx>
> ---
Your description of what has changed in your v2 should go here.
If a v3, then your v2 notes and v3 notes should be here as well.
> include/linux/sched/sysctl.h | 4 ----
> kernel/sched/fair.c | 25 +++++++++++++++++++++++--
> kernel/sysctl.c | 10 ----------
> 3 files changed, 23 insertions(+), 16 deletions(-)
>
> diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
> index c19dd5a2c05c..d416d8f45186 100644
> --- a/include/linux/sched/sysctl.h
> +++ b/include/linux/sched/sysctl.h
> @@ -41,10 +41,6 @@ extern unsigned int sysctl_sched_uclamp_util_max;
> extern unsigned int sysctl_sched_uclamp_util_min_rt_default;
> #endif
>
> -#ifdef CONFIG_CFS_BANDWIDTH
> -extern unsigned int sysctl_sched_cfs_bandwidth_slice;
> -#endif
> -
> #ifdef CONFIG_SCHED_AUTOGROUP
> extern unsigned int sysctl_sched_autogroup_enabled;
> #endif
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 5146163bfabb..354ebf938567 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -141,8 +141,26 @@ int __weak arch_asym_cpu_priority(int cpu)
> *
> * (default: 5 msec, units: microseconds)
> */
> -unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL;
> -#endif
> +static unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL;
> +#ifdef CONFIG_SYSCTL
> +static struct ctl_table sched_cfs_bandwidth_sysctls[] = {
> + {
> + .procname = "sched_cfs_bandwidth_slice_us",
> + .data = &sysctl_sched_cfs_bandwidth_slice,
> + .maxlen = sizeof(unsigned int),
> + .mode = 0644,
> + .proc_handler = proc_dointvec_minmax,
> + .extra1 = SYSCTL_ONE,
> + },
> + {}
> +};
> +
> +static void __init sched_cfs_bandwidth_sysctl_init(void)
> +{
> + register_sysctl_init("kernel", sched_cfs_bandwidth_sysctls);
> +}
> +#endif /* CONFIG_SYSCTL */
Maybe an #else which then adds a no-op sched_cfs_bandwidth_sysctl_init
> +#endif /* CONFIG_CFS_BANDWIDTH */
Likewise, if disabled, then have a no-op sched_cfs_bandwidth_sysctl_init()
> static inline void update_load_add(struct load_weight *lw, unsigned long inc)
> {
> @@ -207,6 +225,9 @@ static void update_sysctl(void)
> void __init sched_init_granularity(void)
> {
> update_sysctl();
> +#if defined(CONFIG_CFS_BANDWIDTH) && defined(CONFIG_SYSCTL)
> + sched_cfs_bandwidth_sysctl_init();
> +#endif
Then you can get remove the #ifdef mess from this code.
But this is a style issue nothing major.
Luis
