linux-kernel - Re: [PATCH v3 3/8] sched, smp: Trace IPIs sent via send_call_function_single

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Message-ID: <Y7lRz7oCaAmAhoqS@gmail.com>
Date:   Sat, 7 Jan 2023 12:04:47 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Valentin Schneider <vschneid@...hat.com>
Cc:     linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
        openrisc@...ts.librecores.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
        x86@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Juri Lelli <juri.lelli@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Nicholas Piggin <npiggin@...il.com>,
        Guo Ren <guoren@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3 3/8] sched, smp: Trace IPIs sent via
 send_call_function_single_ipi()


* Valentin Schneider <vschneid@...hat.com> wrote:

> send_call_function_single_ipi() is the thing that sends IPIs at the bottom
> of smp_call_function*() via either generic_exec_single() or
> smp_call_function_many_cond(). Give it an IPI-related tracepoint.
> 
> Note that this ends up tracing any IPI sent via __smp_call_single_queue(),
> which covers __ttwu_queue_wakelist() and irq_work_queue_on() "for free".
> 
> Signed-off-by: Valentin Schneider <vschneid@...hat.com>
> Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>

Acked-by: Ingo Molnar <mingo@...nel.org>

Patch series logistics:

 - No objections from the scheduler side, this feature looks pretty useful.

 - Certain patches are incomplete, others are noted as being merged 
   separately, so I presume you'll send an updated/completed series 
   eventually?

 - We can merge this via the scheduler tree I suspect, as most callbacks 
   affected relate to tip:sched/core and tmp:smp/core - but if you have 
   some other preferred tree that's fine too.

Thanks,

	Ingo