linux-kernel - Re: [PATCH 1/5] x86: Change size of node ids from u8 to u16 fixup

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Date:	Fri, 18 Jan 2008 20:43:33 -0800
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"David Rientjes" <rientjes@...gle.com>
Cc:	travis@....com, "Andrew Morton" <akpm@...ux-foundation.org>,
	"Andi Kleen" <ak@...e.de>, mingo@...e.hu,
	"Christoph Lameter" <clameter@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, "Eric Dumazet" <dada1@...mosbay.com>
Subject: Re: [PATCH 1/5] x86: Change size of node ids from u8 to u16 fixup

On Jan 18, 2008 8:36 PM, David Rientjes <rientjes@...gle.com> wrote:
> On Fri, 18 Jan 2008, Yinghai Lu wrote:
>
> > > +#if MAX_NUMNODES > 256
> > > +typedef u16 numanode_t;
> > > +#else
> > > +typedef u8 numanode_t;
> > > +#endif
> > > +
> > >  #endif /* _LINUX_NUMA_H */
> >
> > that is wrong, you can not change pxm_to_node_map from int to u8 or u16.
> >
>
> Yeah, NID_INVAL is negative so no unsigned type will work here,
> unfortunately.  And that reduces the intended savings of your change since
> the smaller type can only be used with a smaller CONFIG_NODES_SHIFT.
>
> > int acpi_map_pxm_to_node(int pxm)
> > {
> >         int node = pxm_to_node_map[pxm];
> >
> >         if (node < 0){
> >                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
> >                         return NID_INVAL;
> >                 node = first_unset_node(nodes_found_map);
> >                 __acpi_map_pxm_to_node(pxm, node);
> >                 node_set(node, nodes_found_map);
> >         }
> >
> >         return node;
> > }
> >
> > node will will be always 255 or 65535
> >
>
> Right.
>
> > please keep that to int.
> >
> > I got
> > SART: PXM 0 -> APIC 0 -> Node 255
> > SART: PXM 0 -> APIC 1 -> Node 255
> > SART: PXM 1 -> APIC 2 -> Node 255
> > SART: PXM 1 -> APIC 3 -> Node 255
> >
>
> I assume this is a typo and those proximity mappings are actually from the
> SRAT.

SRAT for processor only have
PXM and APIC id. setup_node(pxm) will get node id for pxm, start from 0...

> >         if (node < 0){
> >                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
> >                         return NID_INVAL;
> >                 node = first_unset_node(nodes_found_map);
> >                 __acpi_map_pxm_to_node(pxm, node);
> >                 node_set(node, nodes_found_map);
> >         }

YH
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