linux-kernel - Re: [PATCH V3 4/9] tracing/hwlat: Implement the per-cpu mode

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Date:   Fri, 4 Jun 2021 17:31:10 +0200
From:   Daniel Bristot de Oliveira <bristot@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, Phil Auld <pauld@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Kate Carcia <kcarcia@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Clark Willaims <williams@...hat.com>,
        John Kacur <jkacur@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>, linux-doc@...r.kernel.org
Subject: Re: [PATCH V3 4/9] tracing/hwlat: Implement the per-cpu mode

On 6/3/21 11:17 PM, Steven Rostedt wrote:
> On Fri, 14 May 2021 22:51:13 +0200
> Daniel Bristot de Oliveira <bristot@...hat.com> wrote:
> 
>>  void trace_hwlat_callback(bool enter)
>>  {
>> -	if (smp_processor_id() != nmi_cpu)
>> +	struct hwlat_kthread_data *kdata = get_cpu_data();
>> +
>> +	if (kdata->kthread)
> 
> Shouldn't that be:
> 
> 	if (!kdata->kthread)

oops! Fixing in v4.

-- Daniel


> ?
> 
> -- Steve
> 
>>  		return;
>>  
>>  	/*
>> @@ -158,13 +173,13 @@ void trace_hwlat_callback(bool enter)
>>  	 */
>>  	if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) {
>>  		if (enter)
>> -			nmi_ts_start = time_get();
>> +			kdata->nmi_ts_start = time_get();
>>  		else
>> -			nmi_total_ts += time_get() - nmi_ts_start;
>> +			kdata->nmi_total_ts += time_get() - kdata->nmi_ts_start;
>>  	}
>>  
>>  	if (enter)
>> -		nmi_count++;
>> +		kdata->nmi_count++;
>>  }
>>
>