* [PATCH] ftrace: print lazy preemption model
@ 2025-01-03 9:36 Shrikanth Hegde
2025-01-06 13:24 ` Masami Hiramatsu
0 siblings, 1 reply; 2+ messages in thread
From: Shrikanth Hegde @ 2025-01-03 9:36 UTC (permalink / raw)
To: rostedt, mhiramat; +Cc: sshegde, mark.rutland, linux-trace-kernel, linux-kernel
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@linux.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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] ftrace: print lazy preemption model
2025-01-03 9:36 [PATCH] ftrace: print lazy preemption model Shrikanth Hegde
@ 2025-01-06 13:24 ` Masami Hiramatsu
0 siblings, 0 replies; 2+ messages in thread
From: Masami Hiramatsu @ 2025-01-06 13:24 UTC (permalink / raw)
To: Shrikanth Hegde; +Cc: rostedt, mark.rutland, linux-trace-kernel, linux-kernel
On Fri, 3 Jan 2025 15:06:47 +0530
Shrikanth Hegde <sshegde@linux.ibm.com> wrote:
> 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)
>
Looks good to me.
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Thanks,
> Signed-off-by: Shrikanth Hegde <sshegde@linux.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
>
--
Masami Hiramatsu (Google) <mhiramat@kernel.org>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2025-01-06 13:24 ` Masami Hiramatsu
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