linux-kernel - [PATCH v4 6/6] sched_ext: Replace bpf_ktime_get_ns() to scx_bpf_now

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Message-ID: <20241209061531.257531-7-changwoo@igalia.com>
Date: Mon,  9 Dec 2024 15:15:31 +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 6/6] sched_ext: Replace bpf_ktime_get_ns() to scx_bpf_now_ns()

In the BPF schedulers that use bpf_ktime_get_ns() -- scx_central and
scx_flatcg, replace bpf_ktime_get_ns() calls to scx_bpf_now_ns().

Signed-off-by: Changwoo Min <changwoo@...lia.com>
---
 tools/sched_ext/scx_central.bpf.c | 4 ++--
 tools/sched_ext/scx_flatcg.bpf.c  | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/sched_ext/scx_central.bpf.c b/tools/sched_ext/scx_central.bpf.c
index e6fad6211f6c..e64b7a429126 100644
--- a/tools/sched_ext/scx_central.bpf.c
+++ b/tools/sched_ext/scx_central.bpf.c
@@ -245,7 +245,7 @@ void BPF_STRUCT_OPS(central_running, struct task_struct *p)
 	s32 cpu = scx_bpf_task_cpu(p);
 	u64 *started_at = ARRAY_ELEM_PTR(cpu_started_at, cpu, nr_cpu_ids);
 	if (started_at)
-		*started_at = bpf_ktime_get_ns() ?: 1;	/* 0 indicates idle */
+		*started_at = scx_bpf_now_ns() ?: 1;	/* 0 indicates idle */
 }
 
 void BPF_STRUCT_OPS(central_stopping, struct task_struct *p, bool runnable)
@@ -258,7 +258,7 @@ void BPF_STRUCT_OPS(central_stopping, struct task_struct *p, bool runnable)
 
 static int central_timerfn(void *map, int *key, struct bpf_timer *timer)
 {
-	u64 now = bpf_ktime_get_ns();
+	u64 now = scx_bpf_now_ns();
 	u64 nr_to_kick = nr_queued;
 	s32 i, curr_cpu;
 
diff --git a/tools/sched_ext/scx_flatcg.bpf.c b/tools/sched_ext/scx_flatcg.bpf.c
index 4e3afcd260bf..568581b15c44 100644
--- a/tools/sched_ext/scx_flatcg.bpf.c
+++ b/tools/sched_ext/scx_flatcg.bpf.c
@@ -734,7 +734,7 @@ void BPF_STRUCT_OPS(fcg_dispatch, s32 cpu, struct task_struct *prev)
 	struct fcg_cpu_ctx *cpuc;
 	struct fcg_cgrp_ctx *cgc;
 	struct cgroup *cgrp;
-	u64 now = bpf_ktime_get_ns();
+	u64 now = scx_bpf_now_ns();
 	bool picked_next = false;
 
 	cpuc = find_cpu_ctx();
-- 
2.47.1