linux-kernel - [PATCH] ftrace: print lazy preemption model

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Message-ID: <20250103093647.575919-1-sshegde@linux.ibm.com>
Date: Fri,  3 Jan 2025 15:06:47 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: rostedt@...dmis.org, mhiramat@...nel.org
Cc: sshegde@...ux.ibm.com, mark.rutland@....com,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ftrace: print lazy preemption model

Print lazy preemption model in ftrace header when latency-format=1.

cat /sys/kernel/debug/sched/preempt 
none voluntary full (lazy)

Without patch:
latency: 0 us, #232946/232946, CPU#40 | (M:unknown VP:0, KP:0, SP:0 HP:0 #P:80)
With Patch:
latency: 0 us, #1897938/25566788, CPU#16 | (M:lazy VP:0, KP:0, SP:0 HP:0 #P:80)

Signed-off-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
---
 kernel/trace/trace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f8aebcb01e62..b6e40e8791fa 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4122,6 +4122,7 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
 		   preempt_model_none()      ? "server" :
 		   preempt_model_voluntary() ? "desktop" :
 		   preempt_model_full()      ? "preempt" :
+		   preempt_model_lazy()	     ? "lazy"    :
 		   preempt_model_rt()        ? "preempt_rt" :
 		   "unknown",
 		   /* These are reserved for later use */
-- 
2.39.3