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

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Date:   Wed, 17 Nov 2021 17:38:28 +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: [PATCH v1] sched/numa: add per-process
 numa_balancing

On 11/17/21 4:29 PM, Mel Gorman wrote:
> 
> It's a bit vague but if you wanted to put together the outline, I'd read
> over it. Note that this was all in the context of trying to introduce an

Sorry, maybe I shouldn't propose new feature in this context.

> API like
> 
> Disable/enable per-process numa balancing:
>          prctl(PR_NUMA_BALANCING, PR_SET_NUMA_BALANCING, 0/1);
> 
> i.e. one that controlled both enabling and disabling. You also have
> the option of introducing the NUMAB equivalent of PR_SET_THP_DISABLE --
> an API that is explicitly about disabling *only*.
> 

If those APIs are ok with you, I will send v2 soon.

1. prctl(PR_NUMA_BALANCING, PR_SET_THP_DISABLE);
2. prctl(PR_NUMA_BALANCING, PR_SET_THP_ENABLE);
3. prctl(PR_NUMA_BALANCING, PR_GET_THP);

IIUC, "THP" means "this process" or "the process".