linux-kernel - Re: [PATCH RESEND] sched/numa: expose per-task pages-migration-failure

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Date:   Tue, 3 Dec 2019 17:25:49 +0800
From:   王贇 <yun.wang@...ux.alibaba.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Michal Koutný <mkoutny@...e.com>,
        Mel Gorman <mgorman@...e.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND] sched/numa: expose per-task
 pages-migration-failure

On 2019/12/3 下午3:16, Ingo Molnar wrote:
[snip]
>>  kernel/sched/debug.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
>> index f7e4579e746c..73c4809c8f37 100644
>> --- a/kernel/sched/debug.c
>> +++ b/kernel/sched/debug.c
>> @@ -848,6 +848,7 @@ static void sched_show_numa(struct task_struct *p, struct seq_file *m)
>>  	P(total_numa_faults);
>>  	SEQ_printf(m, "current_node=%d, numa_group_id=%d\n",
>>  			task_node(p), task_numa_group_id(p));
>> +	SEQ_printf(m, "migfailed=%lu\n", p->numa_faults_locality[2]);
> 
> Any reason not to expose the other 2 fields of this array as well, which 
> show remote/local migrations?

The rest are local/remote faults counter, AFAIK not related to
migration, when the CPU triggered PF is from the same node of page
(before migration), local faults increased.

Regards,
Michael Wang

> 
> Thanks,
> 
> 	Ingo
>