linux-kernel - Re: [tip: sched/core] sched/numa: Avoid migrating task to CPU-less node

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Message-ID: <YiYOc0NFlzJocYt0@qian>
Date:   Mon, 7 Mar 2022 08:53:55 -0500
From:   Qian Cai <quic_qiancai@...cinc.com>
To:     "Huang, Ying" <ying.huang@...el.com>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-tip-commits@...r.kernel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, <x86@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [tip: sched/core] sched/numa: Avoid migrating task to CPU-less
 node

On Mon, Mar 07, 2022 at 01:51:55PM +0800, Huang, Ying wrote:
> > ---
> >  kernel/sched/fair.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> > index a3f0ea216ccb..1fe7a4510cca 100644
> > --- a/kernel/sched/fair.c
> > +++ b/kernel/sched/fair.c
> > @@ -2405,7 +2405,7 @@ static void task_numa_placement(struct task_struct *p)
> >  	}
> >  
> >  	/* Cannot migrate task to CPU-less node */
> > -	if (!node_state(max_nid, N_CPU)) {
> > +	if (max_nid != NUMA_NO_NODE && !node_state(max_nid, N_CPU)) {
> >  		int near_nid = max_nid;
> >  		int distance, near_distance = INT_MAX;
> 
> Do you have time to give this patch a try?

Ah, I thought I has already replied it a while ago. Anyway, it works fine.