linux-kernel - Re: [PATCH v7 2/6] sched: Add helper kstat_cpu_softirqs

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Date:   Mon, 14 Nov 2022 20:45:26 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Frederic Weisbecker <frederic@...nel.org>
CC:     "Paul E . McKenney" <paulmck@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Josh Triplett <josh@...htriplett.org>,
        "Steven Rostedt" <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>, <rcu@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Robert Elliott <elliott@....com>
Subject: Re: [PATCH v7 2/6] sched: Add helper kstat_cpu_softirqs_sum()



On 2022/11/14 19:42, Frederic Weisbecker wrote:
> On Fri, Nov 11, 2022 at 09:07:05PM +0800, Zhen Lei wrote:
>> Similar to kstat_cpu_irqs_sum(), it counts the sum of all software
>> interrupts on a specified CPU.
>>
>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>> ---
>>  include/linux/kernel_stat.h | 11 +++++++++++
>>  1 file changed, 11 insertions(+)
>>
>> diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
>> index 90e2fdc17d79ff8..898076e173a928a 100644
>> --- a/include/linux/kernel_stat.h
>> +++ b/include/linux/kernel_stat.h
>> @@ -67,6 +67,17 @@ static inline unsigned int kstat_softirqs_cpu(unsigned int irq, int cpu)
>>         return kstat_cpu(cpu).softirqs[irq];
>>  }
>>  
>> +static inline unsigned int kstat_cpu_softirqs_sum(int cpu)
>> +{
>> +	int i;
>> +	unsigned int sum = 0;
>> +
>> +	for (i = 0; i < NR_SOFTIRQS; i++)
>> +		sum += kstat_softirqs_cpu(i, cpu);
> 
> This should return a u64 or at least an unsigned long so that high
> numbers of CPUs don't overflow easily.

OK! Then I'll adjust the following types by the way.

struct kernel_stat {
        unsigned long irqs_sum;
        unsigned int softirqs[NR_SOFTIRQS];
};

static inline unsigned int kstat_softirqs_cpu(unsigned int irq, int cpu)




> 
> Thanks.
> 
>> +
>> +	return sum;
>> +}
>> +
>>  /*
>>   * Number of interrupts per specific IRQ source, since bootup
>>   */
>> -- 
>> 2.25.1
>>
> .
> 

-- 
Regards,
  Zhen Lei