Commit ba1c9d32 authored by Tianchen Ding's avatar Tianchen Ding Committed by Tejun Heo
Browse files

sched_ext: Use btf_ids to resolve task_struct 



Save the searching time during bpf_scx_init.

Signed-off-by: default avatarTianchen Ding <dtcccc@linux.alibaba.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 161853a7

kernel/sched/ext.c

+2 −9
Original line number Diff line number Diff line
@@ -5324,7 +5324,6 @@ static int scx_ops_enable(struct sched_ext_ops *ops, struct bpf_link *link) 


extern struct btf *btf_vmlinux;

static const struct btf_type *task_struct_type;

static u32 task_struct_type_id;



static bool set_arg_maybe_null(const char *op, int arg_n, int off, int size,

			       enum bpf_access_type type,
@@ -5376,7 +5375,7 @@ static bool set_arg_maybe_null(const char *op, int arg_n, int off, int size, 
		 */

		info->reg_type = PTR_MAYBE_NULL | PTR_TO_BTF_ID | PTR_TRUSTED;

		info->btf = btf_vmlinux;

		info->btf_id = task_struct_type_id;

		info->btf_id = btf_tracing_ids[BTF_TRACING_TYPE_TASK];



		return true;

	}
@@ -5528,13 +5527,7 @@ static void bpf_scx_unreg(void *kdata, struct bpf_link *link) 


static int bpf_scx_init(struct btf *btf)

{

	s32 type_id;



	type_id = btf_find_by_name_kind(btf, "task_struct", BTF_KIND_STRUCT);

	if (type_id < 0)

		return -EINVAL;

	task_struct_type = btf_type_by_id(btf, type_id);

	task_struct_type_id = type_id;

	task_struct_type = btf_type_by_id(btf, btf_tracing_ids[BTF_TRACING_TYPE_TASK]);



	return 0;

}