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From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, Mel Gorman <mgorman@suse.de>,
	Vlastimil Babka <vbabka@suse.cz>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Christopher Lameter <cl@linux.com>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 1/3] powerpc/numa: Set numa_node for all possible cpus
Date: Thu, 12 Mar 2020 10:57:07 +0530
Message-ID: <20200312052707.GA3277@linux.vnet.ibm.com> (raw)
In-Reply-To: <20200311115735.GM23944@dhcp22.suse.cz>

* Michal Hocko <mhocko@kernel.org> [2020-03-11 12:57:35]:

> On Wed 11-03-20 16:32:35, Srikar Dronamraju wrote:
> > A Powerpc system with multiple possible nodes and with CONFIG_NUMA
> > enabled always used to have a node 0, even if node 0 does not any cpus
> > or memory attached to it. As per PAPR, node affinity of a cpu is only
> > available once its present / online. For all cpus that are possible but
> > not present, cpu_to_node() would point to node 0.
> > 
> > To ensure a cpuless, memoryless dummy node is not online, powerpc need
> > to make sure all possible but not present cpu_to_node are set to a
> > proper node.
> 
> Just curious, is this somehow related to
> http://lkml.kernel.org/r/20200227182650.GG3771@dhcp22.suse.cz?
> 

The issue I am trying to fix is a known issue in Powerpc since many years.
So this surely not a problem after a75056fc1e7c (mm/memcontrol.c: allocate
shrinker_map on appropriate NUMA node"). 

I tried v5.6-rc4 + a75056fc1e7c but didnt face any issues booting the
kernel. Will work with Sachin/Abdul (reporters of the issue).


> > Cc: linuxppc-dev@lists.ozlabs.org
> > Cc: linux-mm@kvack.org
> > Cc: linux-kernel@vger.kernel.org
> > Cc: Michal Hocko <mhocko@suse.com>
> > Cc: Mel Gorman <mgorman@suse.de>
> > Cc: Vlastimil Babka <vbabka@suse.cz>
> > Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
> > Cc: Christopher Lameter <cl@linux.com>
> > Cc: Michael Ellerman <mpe@ellerman.id.au>
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Cc: Linus Torvalds <torvalds@linux-foundation.org>
> > Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
> > ---
> >  arch/powerpc/mm/numa.c | 16 ++++++++++++++--
> >  1 file changed, 14 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
> > index 8a399db..54dcd49 100644
> > --- a/arch/powerpc/mm/numa.c
> > +++ b/arch/powerpc/mm/numa.c
> > @@ -931,8 +931,20 @@ void __init mem_topology_setup(void)
> >  
> >  	reset_numa_cpu_lookup_table();
> >  
> > -	for_each_present_cpu(cpu)
> > -		numa_setup_cpu(cpu);
> > +	for_each_possible_cpu(cpu) {
> > +		/*
> > +		 * Powerpc with CONFIG_NUMA always used to have a node 0,
> > +		 * even if it was memoryless or cpuless. For all cpus that
> > +		 * are possible but not present, cpu_to_node() would point
> > +		 * to node 0. To remove a cpuless, memoryless dummy node,
> > +		 * powerpc need to make sure all possible but not present
> > +		 * cpu_to_node are set to a proper node.
> > +		 */
> > +		if (cpu_present(cpu))
> > +			numa_setup_cpu(cpu);
> > +		else
> > +			set_cpu_numa_node(cpu, first_online_node);
> > +	}
> >  }
> >  
> >  void __init initmem_init(void)
> > -- 
> > 1.8.3.1
> 
> -- 
> Michal Hocko
> SUSE Labs

-- 
Thanks and Regards
Srikar Dronamraju


  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-11 11:02 [PATCH 0/3] Offline memoryless cpuless node 0 Srikar Dronamraju
2020-03-11 11:02 ` [PATCH 1/3] powerpc/numa: Set numa_node for all possible cpus Srikar Dronamraju
2020-03-11 11:57   ` Michal Hocko
2020-03-12  5:27     ` Srikar Dronamraju [this message]
2020-03-12  8:23       ` Sachin Sant
2020-03-12  9:30         ` Vlastimil Babka
2020-03-12 13:14           ` Srikar Dronamraju
2020-03-12 13:51             ` Vlastimil Babka
2020-03-12 16:13               ` Srikar Dronamraju
2020-03-12 16:41                 ` Vlastimil Babka
2020-03-13  9:47                   ` Joonsoo Kim
2020-03-13 11:04                     ` Srikar Dronamraju
2020-03-13 11:38                       ` Vlastimil Babka
2020-03-16  8:15                         ` Joonsoo Kim
2020-03-13 11:22                   ` Srikar Dronamraju
2020-03-16  9:06                   ` Michal Hocko
2020-03-17 13:44                     ` Vlastimil Babka
2020-03-17 14:01                       ` Michal Hocko
2020-03-11 11:02 ` [PATCH 2/3] powerpc/numa: Prefer node id queried from vphn Srikar Dronamraju
2020-03-11 11:02 ` [PATCH 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline Srikar Dronamraju
2020-03-15 14:20   ` Christopher Lameter
2020-03-16  8:54     ` Michal Hocko
2020-03-18  7:50       ` Srikar Dronamraju
2020-03-18 18:57       ` Christopher Lameter

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