linux-kernel - Re: [PATCH 01/11] sched_ext: Rename scx_kfunc_set

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Message-ID: <20240830174549.GE5055@maniforge>
Date: Fri, 30 Aug 2024 12:45:49 -0500
From: David Vernet <void@...ifault.com>
To: Tejun Heo <tj@...nel.org>
Cc: kernel-team@...a.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/11] sched_ext: Rename scx_kfunc_set_sleepable to
 unlocked and relocate

On Fri, Aug 30, 2024 at 01:03:45AM -1000, Tejun Heo wrote:
> Sleepables don't need to be in its own kfunc set as each is tagged with
> KF_SLEEPABLE. Rename to scx_kfunc_set_unlocked indicating that rq lock is
> not held and relocate right above the any set. This will be used to add
> kfuncs that are allowed to be called from SYSCALL but not TRACING.
> 
> No functional changes intended.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>

Acked-by: David Vernet <void@...ifault.com>

> ---
>  kernel/sched/ext.c | 66 +++++++++++++++++++++++-----------------------
>  1 file changed, 33 insertions(+), 33 deletions(-)
> 
> diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
> index 140a4612d379..5423554a11af 100644
> --- a/kernel/sched/ext.c
> +++ b/kernel/sched/ext.c
> @@ -5395,35 +5395,6 @@ void __init init_sched_ext_class(void)
>  
>  __bpf_kfunc_start_defs();
>  
> -/**
> - * scx_bpf_create_dsq - Create a custom DSQ
> - * @dsq_id: DSQ to create
> - * @node: NUMA node to allocate from
> - *
> - * Create a custom DSQ identified by @dsq_id. Can be called from any sleepable
> - * scx callback, and any BPF_PROG_TYPE_SYSCALL prog.
> - */
> -__bpf_kfunc s32 scx_bpf_create_dsq(u64 dsq_id, s32 node)
> -{
> -	if (unlikely(node >= (int)nr_node_ids ||
> -		     (node < 0 && node != NUMA_NO_NODE)))
> -		return -EINVAL;
> -	return PTR_ERR_OR_ZERO(create_dsq(dsq_id, node));
> -}
> -
> -__bpf_kfunc_end_defs();
> -
> -BTF_KFUNCS_START(scx_kfunc_ids_sleepable)
> -BTF_ID_FLAGS(func, scx_bpf_create_dsq, KF_SLEEPABLE)
> -BTF_KFUNCS_END(scx_kfunc_ids_sleepable)
> -
> -static const struct btf_kfunc_id_set scx_kfunc_set_sleepable = {
> -	.owner			= THIS_MODULE,
> -	.set			= &scx_kfunc_ids_sleepable,
> -};
> -
> -__bpf_kfunc_start_defs();
> -
>  /**
>   * scx_bpf_select_cpu_dfl - The default implementation of ops.select_cpu()
>   * @p: task_struct to select a CPU for
> @@ -5766,6 +5737,35 @@ static const struct btf_kfunc_id_set scx_kfunc_set_cpu_release = {
>  
>  __bpf_kfunc_start_defs();
>  
> +/**
> + * scx_bpf_create_dsq - Create a custom DSQ
> + * @dsq_id: DSQ to create
> + * @node: NUMA node to allocate from
> + *
> + * Create a custom DSQ identified by @dsq_id. Can be called from any sleepable
> + * scx callback, and any BPF_PROG_TYPE_SYSCALL prog.
> + */
> +__bpf_kfunc s32 scx_bpf_create_dsq(u64 dsq_id, s32 node)
> +{
> +	if (unlikely(node >= (int)nr_node_ids ||
> +		     (node < 0 && node != NUMA_NO_NODE)))
> +		return -EINVAL;
> +	return PTR_ERR_OR_ZERO(create_dsq(dsq_id, node));
> +}
> +
> +__bpf_kfunc_end_defs();
> +
> +BTF_KFUNCS_START(scx_kfunc_ids_unlocked)
> +BTF_ID_FLAGS(func, scx_bpf_create_dsq, KF_SLEEPABLE)
> +BTF_KFUNCS_END(scx_kfunc_ids_unlocked)
> +
> +static const struct btf_kfunc_id_set scx_kfunc_set_unlocked = {
> +	.owner			= THIS_MODULE,
> +	.set			= &scx_kfunc_ids_unlocked,
> +};
> +
> +__bpf_kfunc_start_defs();
> +
>  /**
>   * scx_bpf_kick_cpu - Trigger reschedule on a CPU
>   * @cpu: cpu to kick
> @@ -6462,10 +6462,6 @@ static int __init scx_init(void)
>  	 * check using scx_kf_allowed().
>  	 */
>  	if ((ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
> -					     &scx_kfunc_set_sleepable)) ||
> -	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL,
> -					     &scx_kfunc_set_sleepable)) ||
> -	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
>  					     &scx_kfunc_set_select_cpu)) ||
>  	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
>  					     &scx_kfunc_set_enqueue_dispatch)) ||
> @@ -6473,6 +6469,10 @@ static int __init scx_init(void)
>  					     &scx_kfunc_set_dispatch)) ||
>  	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
>  					     &scx_kfunc_set_cpu_release)) ||
> +	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
> +					     &scx_kfunc_set_unlocked)) ||
> +	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL,
> +					     &scx_kfunc_set_unlocked)) ||
>  	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
>  					     &scx_kfunc_set_any)) ||
>  	    (ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING,
> -- 
> 2.46.0
> 

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