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

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Message-ID: <20230406081501.pS4ZnWaK@linutronix.de>
Date:   Thu, 6 Apr 2023 10:15:01 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
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>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        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 2023-04-06 04:57:18 [-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>

Check
	https://lore.kernel.org/20230307143558.294354-1-vschneid@redhat.com

Sebastian