linux-kernel - [PATCH 6/7] sched_ext: Add scx_bpf_event_stat() and scx_read

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Message-ID: <20250116151543.80163-7-changwoo@igalia.com>
Date: Fri, 17 Jan 2025 00:15:42 +0900
From: Changwoo Min <changwoo@...lia.com>
To: tj@...nel.org,
	void@...ifault.com,
	arighi@...dia.com
Cc: kernel-dev@...lia.com,
	linux-kernel@...r.kernel.org,
	Changwoo Min <changwoo@...lia.com>
Subject: [PATCH 6/7] sched_ext: Add scx_bpf_event_stat() and scx_read_event() for BPF schedulers

scx_bpf_event_stat() is added to the header files so the BPF scheduler
can use it. Also, scx_read_event() is added to read an event type in a
compatible way.

Signed-off-by: Changwoo Min <changwoo@...lia.com>
---
 tools/sched_ext/include/scx/common.bpf.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/sched_ext/include/scx/common.bpf.h b/tools/sched_ext/include/scx/common.bpf.h
index f3e15e9efa76..c526aa8a949a 100644
--- a/tools/sched_ext/include/scx/common.bpf.h
+++ b/tools/sched_ext/include/scx/common.bpf.h
@@ -78,6 +78,10 @@ struct rq *scx_bpf_cpu_rq(s32 cpu) __ksym;
 struct cgroup *scx_bpf_task_cgroup(struct task_struct *p) __ksym __weak;
 u64 scx_bpf_now(void) __ksym __weak;
 
+void scx_bpf_event_stat(struct scx_event_stat *event, size_t event__sz) __ksym __weak;
+#define scx_read_event(e, name)							\
+	(bpf_core_field_exists((e)->name) ? (e)->name : 0)
+
 /*
  * Use the following as @it__iter when calling scx_bpf_dsq_move[_vtime]() from
  * within bpf_for_each() loops.
-- 
2.48.1