Re: [PATCH 1/1] tracing/sched: sched_switch: place prev_comm and next_comm in right order

[Steven Rostedt <rostedt@goodmis.org>]

[ Adding sched maintainers, as this is a scheduling trace event ]

On Wed, 3 Jul 2024 11:33:53 +0800
Tio Zhang <tiozhang@didiglobal.com> wrote:

> Switch the order of prev_comm and next_comm in sched_switch's code to
> align with its printing order.

I'm going to pick this up in my tree, as it is pretty much a nop. It's
just changing the ordering of the assignments of the comm names so that
the copy of prev_comm is with the updates to the prev_fields, and the
next_comm is with the updates to the next fields.

-- Steve


> 
> Signed-off-by: Tio Zhang <tiozhang@didiglobal.com>
> Reviewed-by: Madadi Vineeth Reddy <vineethr@linux.ibm.com>
> ---
>  include/trace/events/sched.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
> index dbb01b4b7451..a4bd4330db4c 100644
> --- a/include/trace/events/sched.h
> +++ b/include/trace/events/sched.h
> @@ -239,11 +239,11 @@ TRACE_EVENT(sched_switch,
>  	),
>  
>  	TP_fast_assign(
> -		memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
> +		memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
>  		__entry->prev_pid	= prev->pid;
>  		__entry->prev_prio	= prev->prio;
>  		__entry->prev_state	= __trace_sched_switch_state(preempt, prev_state, prev);
> -		memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
> +		memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
>  		__entry->next_pid	= next->pid;
>  		__entry->next_prio	= next->prio;
>  		/* XXX SCHED_DEADLINE */