linux-kernel - Re: [PATCH 29/30] Documentation: tracing: add TIF_NEED_RESCHED

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Date: Wed, 21 Feb 2024 16:43:34 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Ankur Arora <ankur.a.arora@...cle.com>
Cc: linux-kernel@...r.kernel.org, tglx@...utronix.de, peterz@...radead.org,
 torvalds@...ux-foundation.org, paulmck@...nel.org,
 akpm@...ux-foundation.org, luto@...nel.org, bp@...en8.de,
 dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
 juri.lelli@...hat.com, vincent.guittot@...aro.org, willy@...radead.org,
 mgorman@...e.de, jpoimboe@...nel.org, mark.rutland@....com,
 jgross@...e.com, andrew.cooper3@...rix.com, bristot@...nel.org,
 mathieu.desnoyers@...icios.com, geert@...ux-m68k.org,
 glaubitz@...sik.fu-berlin.de, anton.ivanov@...bridgegreys.com,
 mattst88@...il.com, krypton@...ich-teichert.org, David.Laight@...LAB.COM,
 richard@....at, mjguzik@...il.com, jon.grimm@....com, bharata@....com,
 raghavendra.kt@....com, boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
 Masami Hiramatsu <mhiramat@...nel.org>, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH 29/30] Documentation: tracing: add TIF_NEED_RESCHED_LAZY

On Mon, 12 Feb 2024 21:55:53 -0800
Ankur Arora <ankur.a.arora@...cle.com> wrote:

> Document various combinations of resched flags.
> 
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Jonathan Corbet <corbet@....net>
> Originally-by: Thomas Gleixner <tglx@...utronix.de>
> Link: https://lore.kernel.org/lkml/87jzshhexi.ffs@tglx/
> Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
> ---
>  Documentation/trace/ftrace.rst | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
> index 7e7b8ec17934..7f20c0bae009 100644
> --- a/Documentation/trace/ftrace.rst
> +++ b/Documentation/trace/ftrace.rst
> @@ -1036,8 +1036,12 @@ explains which is which.
>  		be printed here.
>  
>    need-resched:
> -	- 'N' both TIF_NEED_RESCHED and PREEMPT_NEED_RESCHED is set,
> +	- 'B' all three, TIF_NEED_RESCHED, TIF_NEED_RESCHED_LAZY and PREEMPT_NEED_RESCHED are set,
> +	- 'N' both TIF_NEED_RESCHED and PREEMPT_NEED_RESCHED are set,
> +	- 'L' both TIF_NEED_RESCHED_LAZY and PREEMPT_NEED_RESCHED are set,
> +	- 'b' both TIF_NEED_RESCHED and TIF_NEED_RESCHED_LAZY are set,
>  	- 'n' only TIF_NEED_RESCHED is set,
> +	- 'l' only TIF_NEED_RESCHED_LAZY is set,
>  	- 'p' only PREEMPT_NEED_RESCHED is set,
>  	- '.' otherwise.
>  

I wonder if we should also add this information in /sys/kernel/tracing/README
so that it is easier to find on a machine.

-- Steve