Commit 24e0e610 authored by Shrikanth Hegde's avatar Shrikanth Hegde Committed by Steven Rostedt (Google)
Browse files

tracing: 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)
                                                ^^^^

Now that lazy preemption is part of the kernel, make sure the tracing
infrastructure reflects that.

Link: https://lore.kernel.org/20250103093647.575919-1-sshegde@linux.ibm.com


Signed-off-by: default avatarShrikanth Hegde <sshegde@linux.ibm.com>
Acked-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent a485ea9e

kernel/trace/trace.c

+1 −0
Original line number Diff line number Diff line
@@ -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 */