linux-kernel - [PATCH v4 5/6] sched_ext: Add scx_bpf_now

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Message-ID: <20241209061531.257531-6-changwoo@igalia.com>
Date: Mon,  9 Dec 2024 15:15:30 +0900
From: Changwoo Min <multics69@...il.com>
To: tj@...nel.org,
	void@...ifault.com,
	mingo@...hat.com,
	peterz@...radead.org
Cc: changwoo@...lia.com,
	kernel-dev@...lia.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 5/6] sched_ext: Add scx_bpf_now_ns() for BPF scheduler

scx_bpf_now_ns() is added to the header files so the BPF scheduler
can use it.

Signed-off-by: Changwoo Min <changwoo@...lia.com>
---
 tools/sched_ext/include/scx/common.bpf.h | 1 +
 tools/sched_ext/include/scx/compat.bpf.h | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/tools/sched_ext/include/scx/common.bpf.h b/tools/sched_ext/include/scx/common.bpf.h
index 625f5b046776..d8fd58d8c032 100644
--- a/tools/sched_ext/include/scx/common.bpf.h
+++ b/tools/sched_ext/include/scx/common.bpf.h
@@ -72,6 +72,7 @@ bool scx_bpf_task_running(const struct task_struct *p) __ksym;
 s32 scx_bpf_task_cpu(const struct task_struct *p) __ksym;
 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_ns(void) __ksym __weak;
 
 /*
  * Use the following as @it__iter when calling scx_bpf_dsq_move[_vtime]() from
diff --git a/tools/sched_ext/include/scx/compat.bpf.h b/tools/sched_ext/include/scx/compat.bpf.h
index d56520100a26..2f16f30ae741 100644
--- a/tools/sched_ext/include/scx/compat.bpf.h
+++ b/tools/sched_ext/include/scx/compat.bpf.h
@@ -125,6 +125,11 @@ bool scx_bpf_dispatch_vtime_from_dsq___compat(struct bpf_iter_scx_dsq *it__iter,
 	false;									\
 })
 
+#define scx_bpf_now_ns()							\
+	(bpf_ksym_exists(scx_bpf_now_ns) ?					\
+	 scx_bpf_now_ns() :							\
+	 bpf_ktime_get_ns())
+
 /*
  * Define sched_ext_ops. This may be expanded to define multiple variants for
  * backward compatibility. See compat.h::SCX_OPS_LOAD/ATTACH().
-- 
2.47.1