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Message-Id: <20241017024412.16914-1-dtcccc@linux.alibaba.com>
Date: Thu, 17 Oct 2024 10:44:12 +0800
From: Tianchen Ding <dtcccc@...ux.alibaba.com>
To: linux-kernel@...r.kernel.org
Cc: Tejun Heo <tj@...nel.org>,
David Vernet <void@...ifault.com>,
Peter Zijlstra <peterz@...radead.org>,
Alexei Starovoitov <alexei.starovoitov@...il.com>,
bpf@...r.kernel.org
Subject: [PATCH v2] sched_ext: Use btf_ids to resolve task_struct
Save the searching time during bpf_scx_init.
Signed-off-by: Tianchen Ding <dtcccc@...ux.alibaba.com>
---
v2:
Use the existing btf_tracing_ids[BTF_TRACING_TYPE_TASK].
v1: https://lore.kernel.org/all/20241016024100.7409-1-dtcccc@linux.alibaba.com/
---
kernel/sched/ext.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 609b9fb00d6f..09fe4e1552bb 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -5343,7 +5343,6 @@ 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,
@@ -5395,7 +5394,7 @@ 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;
}
@@ -5547,13 +5546,7 @@ 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;
}
--
2.39.3
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