linux-kernel - Re: [PATCH 09/10] sched/fair: disable stealing if too many NUMA nodes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <629c5dc5-cde4-76de-4680-9fb5ecfd26cd@oracle.com>
Date:   Tue, 23 Oct 2018 09:18:42 -0400
From:   Steven Sistare <steven.sistare@...cle.com>
To:     mingo@...hat.com, peterz@...radead.org
Cc:     subhra.mazumdar@...cle.com, dhaval.giani@...cle.com,
        rohit.k.jain@...cle.com, daniel.m.jordan@...cle.com,
        pavel.tatashin@...rosoft.com, matt@...eblueprint.co.uk,
        umgwanakikbuti@...il.com, riel@...hat.com, jbacik@...com,
        juri.lelli@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/10] sched/fair: disable stealing if too many NUMA nodes

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