Re: [PATCH v4 2/3] powerpc/numa: Prefer node id queried from vphn

[Gautham R Shenoy <ego@linux.vnet.ibm.com>]

On Tue, May 12, 2020 at 06:59:36PM +0530, Srikar Dronamraju wrote:
> Node id queried from the static device tree may not
> be correct. For example: it may always show 0 on a shared processor.
> Hence prefer the node id queried from vphn and fallback on the device tree
> based node id if vphn query fails.
> 
> 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>
> Cc: Gautham R Shenoy <ego@linux.vnet.ibm.com>
> Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
> Cc: David Hildenbrand <david@redhat.com>
> Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>

Looks good to me.

Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>

> ---
> Changelog v2:->v3:
> - Resolved comments from Gautham.
> Link v2: https://lore.kernel.org/linuxppc-dev/20200428093836.27190-1-srikar@linux.vnet.ibm.com/t/#u
> 
> Changelog v1:->v2:
> - Rebased to v5.7-rc3
> 
>  arch/powerpc/mm/numa.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
> index b3615b7..2815313 100644
> --- a/arch/powerpc/mm/numa.c
> +++ b/arch/powerpc/mm/numa.c
> @@ -719,20 +719,20 @@ static int __init parse_numa_properties(void)
>  	 */
>  	for_each_present_cpu(i) {
>  		struct device_node *cpu;
> -		int nid;
> -
> -		cpu = of_get_cpu_node(i, NULL);
> -		BUG_ON(!cpu);
> -		nid = of_node_to_nid_single(cpu);
> -		of_node_put(cpu);
> +		int nid = vphn_get_nid(i);
> 
>  		/*
>  		 * Don't fall back to default_nid yet -- we will plug
>  		 * cpus into nodes once the memory scan has discovered
>  		 * the topology.
>  		 */
> -		if (nid < 0)
> -			continue;
> -		node_set_online(nid);
> +		if (nid == NUMA_NO_NODE) {
> +			cpu = of_get_cpu_node(i, NULL);
> +			BUG_ON(!cpu);
> +			nid = of_node_to_nid_single(cpu);
> +			of_node_put(cpu);
> +		}
> +
> +		if (likely(nid > 0))
> +			node_set_online(nid);
>  	}
> 
>  	get_n_mem_cells(&n_mem_addr_cells, &n_mem_size_cells);
> -- 
> 1.8.3.1
>