linux-kernel - Re: [PATCH v3] sched/numa: add per-process numa

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Message-ID: <15bbfed1-5b7c-e6ff-07e9-9de3a0ee4728@bytedance.com>
Date:   Mon, 13 Dec 2021 14:49:48 +0800
From:   Gang Li <ligang.bdlg@...edance.com>
To:     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>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v3] sched/numa: add per-process numa_balancing

Hi,
Any comments plz ;)

On 2021/12/6 10:45, Gang Li wrote:
> This patch add a new api PR_NUMA_BALANCING in prctl.
> 
> A large number of page faults will cause performance loss when numa
> balancing is performing. Thus those processes which care about worst-case
> performance need numa balancing disabled. Others, on the contrary, allow a
> temporary performance loss in exchange for higher average performance, so
> enable numa balancing is better for them.
> 
> Numa balancing can only be controlled globally by
> /proc/sys/kernel/numa_balancing. Due to the above case, we want to
> disable/enable numa_balancing per-process instead.
> 
> Add numa_balancing under mm_struct. Then use it in task_tick_fair.
> 
> Set per-process numa balancing:
> 	prctl(PR_NUMA_BALANCING, PR_SET_NUMAB_DISABLE); //disable
> 	prctl(PR_NUMA_BALANCING, PR_SET_NUMAB_ENABLE);  //enable
> 	prctl(PR_NUMA_BALANCING, PR_SET_NUMAB_DEFAULT); //follow global
> Get numa_balancing state:
> 	prctl(PR_NUMA_BALANCING, PR_GET_NUMAB, &ret);
> 	cat /proc/<pid>/status | grep NumaB_enabled
> 
> Cc: linux-api@...r.kernel.org
> Signed-off-by: Gang Li <ligang.bdlg@...edance.com>