linux-kernel - Re: [RFC PATCH 1/1] smp: Add tracepoints for functions called with smp_call

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Message-ID: <20230406095519.GG386572@hirez.programming.kicks-ass.net>
Date:   Thu, 6 Apr 2023 11:55:19 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Leonardo Bras <leobras@...hat.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yury Norov <yury.norov@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Nadav Amit <namit@...are.com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [RFC PATCH 1/1] smp: Add tracepoints for functions called with
 smp_call_function*()

On Thu, Apr 06, 2023 at 04:57:18AM -0300, Leonardo Bras wrote:
> When running RT workloads in isolated CPUs, many cases of deadline misses
> are caused by remote CPU requests such as smp_call_function*().
> 
> For those cases, having the names of those functions running around the
> deadline miss moment could help finding a target for the next improvements.
> 
> Add tracepoints for acquiring the funtion name & argument before entry and
> after exitting the called function.
> 
> Signed-off-by: Leonardo Bras <leobras@...hat.com>

How are the patches queued there not sufficient?

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/?h=smp/core