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From:   Valentin Schneider <vschneid@redhat.com>
To:     Steven Rostedt <rostedt@goodmis.org>
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Subject: Re: [RFC PATCH 4/5] irq_work: Trace calls to arch_irq_work_raise()
In-Reply-To: <20221008153442.159b2f2d@rorschach.local.home>
References: <20221007154145.1877054-1-vschneid@redhat.com>
 <20221007154533.1878285-4-vschneid@redhat.com>
 <20221008153442.159b2f2d@rorschach.local.home>
Date:   Tue, 11 Oct 2022 16:02:06 +0100
Message-ID: <xhsmhlepmflox.mognet@vschneid.remote.csb>
MIME-Version: 1.0
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On 08/10/22 15:34, Steven Rostedt wrote:
> On Fri,  7 Oct 2022 16:45:32 +0100
> Valentin Schneider <vschneid@redhat.com> wrote:
>>  }
>>  
>> +static inline void irq_work_raise(void)
>> +{
>> +	if (arch_irq_work_has_interrupt())
>> +		trace_ipi_send_cpu(_RET_IP_, smp_processor_id());
>
> To save on the branch, let's make the above:
>
> 	if (trace_ipi_send_cpu_enabled() && arch_irq_work_has_interrupt())
>
> As the "trace_*_enabled()" is a static branch that will make it a nop
> when the tracepoint is not enabled.
>

Makes sense, thanks for the suggestion.

> -- Steve
>
>
>> +
>> +	arch_irq_work_raise();
>> +}
>> +
>>  /* Enqueue on current CPU, work must already be claimed and preempt disabled */