linux-kernel - Re: Re: Re: Re: Re: Re: Re: Re: [PATCH v1] sched/numa: add per-process numa

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Date:   Thu, 18 Nov 2021 11:26:30 +0800
From:   Gang Li <ligang.bdlg@...edance.com>
To:     Mel Gorman <mgorman@...e.de>
Cc:     Jonathan Corbet <corbet@....net>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        linux-api@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: Re: Re: Re: Re: Re: Re: Re: [PATCH v1] sched/numa: add
 per-process numa_balancing

On 11/17/21 6:10 PM, Mel Gorman wrote:
> On Wed, Nov 17, 2021 at 05:38:28PM +0800, Gang Li wrote:
>> If those APIs are ok with you, I will send v2 soon.
>>
>> 1. prctl(PR_NUMA_BALANCING, PR_SET_THP_DISABLE);
> 
> It would be (PR_SET_NUMAB_DISABLE, 1)
> 
>> 2. prctl(PR_NUMA_BALANCING, PR_SET_THP_ENABLE);
> 
> An enable prctl will have the same problems as
> prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING, 0/1) -- it should have
> meaning if the numa_balancing sysctl is disabled.
> 
>> 3. prctl(PR_NUMA_BALANCING, PR_GET_THP);
>>
> 
> PR_GET_NUMAB_DISABLE
> 

How about this:

1. prctl(PR_NUMA_BALANCING, PR_SET_NUMAB_DEFAULT); //follow global
2. prctl(PR_NUMA_BALANCING, PR_SET_NUMAB_DISABLE); //disable
3. prctl(PR_NUMA_BALANCING, PR_SET_NUMAB_ENABLE);  //enable
4. prctl(PR_NUMA_BALANCING, PR_GET_NUMAB);

PR_SET_NUMAB_DISABLE/ENABLE can always have meaning whether the
numa_balancing sysctl is disabled or not,

-- 
Thanks,
Gang Li