linux-kernel - Re: [RFC PATCH v4 0/2] trace,smp: Add tracepoints for csd

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Message-ID: <cefdad7f7154155f69d9613efe53f9cbbea2ed20.camel@redhat.com>
Date:   Mon, 15 May 2023 15:47:51 -0300
From:   Leonardo Brás <leobras@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Nadav Amit <namit@...are.com>,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Yury Norov <yury.norov@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v4 0/2] trace,smp: Add tracepoints for csd

On Mon, 2023-05-15 at 15:30 -0300, Leonardo Bras wrote:
> Changes since RFCv3:
> - Split the patch in 2: entry/exit and queue
> - Fix 'struct __call_single_data' & call_single_data_t alignment issue
> - Made all TP_printk follow the same pattern
> 
> Changes since RFCv2:
> - Fixed some spacing issues and trace calls
> 
> Changes since RFCv1:
> - Implemented trace_csd_queue_cpu() as suggested by Valentin Schneider
> - Using EVENT_CLASS in order to avoid duplication
> - Introduced new helper: csd_do_func()
> - Name change from smp_call_function_* to csd_function_*
> - Rebased on top of torvalds/master
> 
> Leonardo Bras (2):
>   trace,smp: Add tracepoints around remotelly called functions
>   trace,smp: Add tracepoints for scheduling remotelly called functions
> 
>  include/trace/events/smp.h | 72 ++++++++++++++++++++++++++++++++++++++
>  kernel/smp.c               | 41 +++++++++++++---------
>  2 files changed, 96 insertions(+), 17 deletions(-)
>  create mode 100644 include/trace/events/smp.h
> 

argh, almost sure some llvm build will output some alignment warning because
csd_do_func() has an 'struct __call_single_data' argument while the tracepoints
have call_single_data_t arguments.

Other than that, it should be fine.
I will collect other suggestions before sending a v5 with this fix.

Leo