linux-kernel - Re: [PATCH v4 03/25] rseq: Extend struct rseq with numa node id

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Date:   Fri, 23 Sep 2022 13:13:12 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        "H . Peter Anvin" <hpa@...or.com>, Paul Turner <pjt@...gle.com>,
        linux-api@...r.kernel.org, Christian Brauner <brauner@...nel.org>,
        Florian Weimer <fw@...eb.enyo.de>, David.Laight@...lab.com,
        carlos@...hat.com, Peter Oskolkov <posk@...k.io>,
        Alexander Mikhalitsyn <alexander@...alicyn.com>
Subject: Re: [PATCH v4 03/25] rseq: Extend struct rseq with numa node id

On Thu, Sep 22, 2022 at 06:59:18AM -0400, Mathieu Desnoyers wrote:
> diff --git a/include/trace/events/rseq.h b/include/trace/events/rseq.h
> index a04a64bc1a00..6bd442697354 100644
> --- a/include/trace/events/rseq.h
> +++ b/include/trace/events/rseq.h
> @@ -16,13 +16,15 @@ TRACE_EVENT(rseq_update,
>  
>  	TP_STRUCT__entry(
>  		__field(s32, cpu_id)
> +		__field(s32, node_id)
>  	),
>  
>  	TP_fast_assign(
>  		__entry->cpu_id = raw_smp_processor_id();
> +		__entry->node_id = cpu_to_node(raw_smp_processor_id());

Very minor nit: perhaps:

		_entry->node_id = cpu_to_node(__entry->cpu_id);

just in case it does a reload and finds a different value.

>  	),