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Subject: Re: [PATCH 09/10] sched/fair: disable stealing if too many NUMA nodes
To:     mingo@redhat.com, peterz@infradead.org
Cc:     subhra.mazumdar@oracle.com, dhaval.giani@oracle.com,
        rohit.k.jain@oracle.com, daniel.m.jordan@oracle.com,
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        juri.lelli@redhat.com, linux-kernel@vger.kernel.org
References: <1540220381-424433-1-git-send-email-steven.sistare@oracle.com>
 <1540220381-424433-10-git-send-email-steven.sistare@oracle.com>
From:   Steven Sistare <steven.sistare@oracle.com>
Organization: Oracle Corporation
Message-ID: <629c5dc5-cde4-76de-4680-9fb5ecfd26cd@oracle.com>
Date:   Tue, 23 Oct 2018 09:18:42 -0400
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On 10/22/2018 10:59 AM, Steve Sistare wrote:
[...]
> diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
> index f18c416..b7d2070 100644
> --- a/kernel/sched/topology.c
> +++ b/kernel/sched/topology.c
> @@ -1337,6 +1337,30 @@ static void init_numa_topology_type(void)
>  	}
>  }
>  
> +DEFINE_STATIC_KEY_TRUE(sched_steal_allow);
> +static int sched_steal_node_limit;
> +#define SCHED_STEAL_NODE_LIMIT_DEFAULT 1

This is an oversight; I meant to suggest a value of 2.  All my 2-socket 
testing was done with stealing enabled.

- Steve